Clinical discovery
Find a Clinical Tool
Search and filter 695 published calculators, scores, references and decision tools.
Anaesthesiology
1 toolsAnaesthesiology & Pain Medicine
2 toolsModified Aldrete Recovery Score
Assesses readiness for discharge from the post-anaesthesia care unit using five recovery domains.
Open toolPost-Anaesthetic Discharge Scoring System (PADSS)
Assesses readiness for discharge after ambulatory anaesthesia using vital signs, activity, nausea, pain and bleeding.
Open toolCardiology
66 toolsACEF Cardiac Surgery Risk Score
Provides a simple cardiac surgery risk estimate from age, ejection fraction and renal function.
Open toolADHERE Acute Heart Failure Risk Tree
Stratifies in-hospital mortality risk in acute decompensated heart failure using admission BUN, systolic pressure and creatinine.
Open toolAdult ECG Rate and Interval Reference
Provides concise adult ECG rate and interval reference values.
Open toolAortic Valve Area Calculator
Calculates aortic valve area using the continuity equation.
Open toolAtherogenic Index of Plasma
Calculates the base-10 logarithm of the triglyceride-to-HDL cholesterol ratio using molar concentrations.
Open toolATRIA Bleeding Score
Estimates haemorrhage risk in adults with atrial fibrillation receiving anticoagulation.
Open toolCADILLAC Risk Score
Estimates 1-year mortality after primary PCI for acute myocardial infarction.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Output by Fick Principle
Calculates cardiac output from oxygen consumption and the arterial–venous oxygen content difference.
Open toolCardiac Power Index
Calculates cardiac power indexed to body surface area from mean arterial pressure and cardiac index.
Open toolCardiac Power Index
Calculates cardiac power index from mean arterial pressure and cardiac index.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
Open toolCardShock Risk Score
Estimates short-term mortality in cardiogenic shock using seven bedside variables.
Open toolCastelli Risk Index I
Calculates the total cholesterol-to-HDL cholesterol ratio.
Open toolCastelli Risk Index II
Calculates the LDL cholesterol-to-HDL cholesterol ratio.
Open toolCHA₂DS₂-VA Score
Estimates thromboembolic risk factors in atrial fibrillation without assigning a point for sex.
Open toolCornell Voltage Criterion
Calculates the Cornell ECG voltage criterion for left ventricular hypertrophy.
Open toolCorrected QT (QTc) Calculator
Calculates corrected QT using Bazett, Fridericia, Framingham and Hodges formulae.
Open toolDAPT Score
Estimates the balance of ischaemic benefit and bleeding harm from extending dual antiplatelet therapy beyond 12 months after PCI.
Open toolDiastolic Pulmonary Gradient
Calculates the diastolic pulmonary gradient from diastolic pulmonary artery and wedge pressures.
Open toolDuke Treadmill Score
Calculates the Duke Treadmill Score from exercise time, ST deviation and exercise angina.
Open toolECG QTc Normal Ranges
Provides commonly used adult QTc interpretation thresholds
Open toolEjection Fraction from Ventricular Volumes
Calculates ventricular ejection fraction from end-diastolic and end-systolic volumes.
Open toolEstimated Mean Pulmonary Artery Pressure (Chemla)
Estimates mean pulmonary artery pressure from systolic pulmonary artery pressure using the Chemla equation.
Open toolFriedewald LDL Cholesterol
Estimates LDL cholesterol from total cholesterol, HDL cholesterol and triglycerides using the Friedewald equation.
Open toolGRACE ACS Risk Score
Calculates a bedside GRACE acute coronary syndrome risk score using the established point-based variables.
Open toolHAS-BLED Score
Estimates major bleeding risk in patients with atrial fibrillation using the HAS-BLED clinical risk factors.
Open toolHEAR Score
Risk-stratifies selected adults with acute chest pain using history, ECG, age and cardiovascular risk factors without troponin.
Open toolHEART Score
Risk-stratifies adults with suspected acute coronary syndrome using history, ECG, age, risk factors and troponin.
Open toolHFA–PEFF Diagnostic Score
Supports assessment of heart failure with preserved ejection fraction using functional, morphological and biomarker domains.
Open toolH₂FPEF Score
Calculates the H₂FPEF score for unexplained dyspnoea and suspected HFpEF.
Open toolIABP-SHOCK II Risk Score
Estimates 30-day mortality after PCI for myocardial infarction complicated by cardiogenic shock.
Open toolLeft Ventricular Fractional Shortening
Calculates left ventricular fractional shortening from end-diastolic and end-systolic internal dimensions.
Open toolLeft Ventricular Mass Index
Calculates left ventricular mass and indexes it to body surface area.
Open toolLeft Ventricular Stroke Work
Estimates left ventricular stroke work from stroke volume, mean arterial pressure and pulmonary artery wedge pressure.
Open toolLeft Ventricular Stroke Work Index
Calculates left ventricular stroke work indexed to body surface area.
Open toolMitral Valve Area by Pressure Half-Time
Estimates mitral valve area from Doppler pressure half-time.
Open toolNon-HDL Cholesterol
Calculates non-HDL cholesterol from total cholesterol and HDL cholesterol.
Open toolORBIT Bleeding Score
Estimates major bleeding risk in adults with atrial fibrillation receiving oral anticoagulation.
Open toolPRECISE-DAPT Score
Estimates out-of-hospital bleeding risk during dual antiplatelet therapy after PCI.
Open toolPulmonary Artery Compliance
Calculates pulmonary artery compliance from stroke volume and pulmonary artery pulse pressure.
Open toolPulmonary Artery Pulsatility Index
Calculates pulmonary artery pulsatility index from pulmonary artery pressures and right atrial pressure.
Open toolPulmonary Artery Pulse Pressure
Calculates pulmonary artery pulse pressure from systolic and diastolic pulmonary artery pressures.
Open toolPulmonary Vascular Resistance
Calculates pulmonary vascular resistance from mean pulmonary artery pressure, wedge pressure and cardiac output.
Open toolPulmonary Vascular Resistance (Wood Units)
Calculates pulmonary vascular resistance in Wood units.
Open toolPulmonary Vascular Resistance Index
Calculates indexed pulmonary vascular resistance from mean pulmonary artery pressure, wedge pressure and cardiac index.
Open toolPulmonary-to-Systemic Flow Ratio
Calculates Qp:Qs from oxygen saturations using the Fick principle.
Open toolPulse Pressure
Calculates pulse pressure from systolic and diastolic blood pressure.
Open toolRate Pressure Product
Calculates rate-pressure product from heart rate and systolic blood pressure.
Open toolRelative Wall Thickness
Calculates left ventricular relative wall thickness from posterior wall thickness and end-diastolic diameter.
Open toolRemnant Cholesterol
Estimates remnant cholesterol from total cholesterol, LDL cholesterol and HDL cholesterol.
Open toolRight Ventricular Stroke Work
Estimates right ventricular stroke work from stroke volume, mean pulmonary artery pressure and central venous pressure.
Open toolRight Ventricular Stroke Work Index
Calculates right ventricular stroke work indexed to body surface area.
Open toolSokolow-Lyon Index
Calculates the Sokolow-Lyon ECG voltage criterion for left ventricular hypertrophy.
Open toolStroke Volume Calculator
Calculates stroke volume from LVOT diameter and velocity-time integral.
Open toolStroke Volume Index
Indexes stroke volume to body surface area.
Open toolSystemic Vascular Resistance
Calculates systemic vascular resistance from mean arterial pressure, central venous pressure and cardiac output.
Open toolSystemic Vascular Resistance (Wood Units)
Calculates systemic vascular resistance in Wood units.
Open toolSystemic Vascular Resistance Index
Calculates systemic vascular resistance index from mean arterial pressure, central venous pressure and cardiac index.
Open toolTIMI Risk Index
Calculates the TIMI Risk Index from age, heart rate and systolic blood pressure.
Open toolTIMI Risk Score for STEMI
Estimates 30-day mortality risk at presentation in ST-elevation myocardial infarction.
Open toolTIMI Risk Score for UA/NSTEMI
Calculates the seven-variable TIMI risk score for unstable angina and non-ST-elevation myocardial infarction.
Open toolTranspulmonary Gradient
Calculates the transpulmonary pressure gradient.
Open toolZwolle Risk Score
Supports early discharge assessment after successful primary PCI for STEMI.
Open toolClinical Pharmacology
52 toolsAdrenaline Anaphylaxis Dose Calculator
Calculates a protocol-selected intramuscular adrenaline dose for anaphylaxis.
Open toolAlbumin-Normalised Valproate Concentration
Estimates a normalised total valproate concentration using the Hermida–Tutor albumin-based free-fraction model.
Open toolAmikacin Extended-Interval Concentration Projection
Projects a measured Amikacin concentration to a future time using an individual elimination rate constant.
Open toolAmikacin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Amikacin concentration to a selected peak reference time.
Open toolAmikacin Projected Trough Concentration
Projects a post-distribution Amikacin concentration forward to the end of the dosing interval.
Open toolAmikacin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Amikacin from two post-distribution serum concentrations and their sampling times.
Open toolAmikacin Two-Level Half-Life
Calculates the apparent elimination half-life of Amikacin from two post-distribution concentrations.
Open toolAminoglycoside Dosing Weight
Calculates an adjusted dosing weight for aminoglycosides in patients whose actual weight exceeds ideal weight.
Open toolAmoxicillin Paediatric Dose Calculator
Calculates a clinician-selected weight-based paediatric amoxicillin dose.
Open toolApparent Volume of Distribution
Calculates an apparent volume of distribution from the amount of drug in the body and plasma concentration.
Open toolContinuous Infusion Rate for Target Steady-State Concentration
Calculates a continuous infusion rate from total drug clearance and a target steady-state concentration.
Open toolCorrected Phenytoin by Sheiner–Tozer Equation
Estimates an albumin-adjusted total phenytoin concentration, with an optional coefficient for severe renal impairment.
Open toolDrug Clearance from Dose and AUC
Calculates apparent systemic clearance from dose, bioavailability and area under the concentration–time curve.
Open toolDrug Half-Life from Elimination Rate Constant
Calculates first-order elimination half-life from the elimination rate constant.
Open toolDrug Half-Life from Two Concentrations
Calculates first-order elimination half-life from two post-distribution concentrations and sample times.
Open toolDrug Loading Dose
Calculates a theoretical loading dose from target concentration, apparent volume of distribution and bioavailability.
Open toolDrug Maintenance Dose Rate
Calculates a theoretical maintenance dose rate from target steady-state concentration, clearance and bioavailability.
Open toolElimination Rate Constant from Half-Life
Calculates the first-order elimination rate constant from a drug half-life.
Open toolEnoxaparin Dose Calculator
Calculates a clinician-selected weight-based enoxaparin dose.
Open toolExtrapolated Post-Distribution Peak Concentration
Back-extrapolates a measured post-distribution concentration to an earlier target time using a first-order elimination rate constant.
Open toolFlucloxacillin Dose Calculator
Calculates a clinician-selected flucloxacillin dose calculator dose.
Open toolGentamicin Dose Calculator
Calculates a protocol-selected weight-based gentamicin dose.
Open toolGentamicin Extended-Interval Concentration Projection
Projects a measured Gentamicin concentration to a future time using an individual elimination rate constant.
Open toolGentamicin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Gentamicin concentration to a selected peak reference time.
Open toolGentamicin Projected Trough Concentration
Projects a post-distribution Gentamicin concentration forward to the end of the dosing interval.
Open toolGentamicin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Gentamicin from two post-distribution serum concentrations and their sampling times.
Open toolGentamicin Two-Level Half-Life
Calculates the apparent elimination half-life of Gentamicin from two post-distribution concentrations.
Open toolIbuprofen Paediatric Dose Calculator
Calculates a clinician-selected weight-based paediatric ibuprofen dose.
Open toolINR Therapeutic Range Reference
Provides commonly used warfarin INR target ranges for selected indications.
Open toolInsulin Infusion Rate Calculator
Calculates infusion rate from a prescribed insulin rate and prepared concentration.
Open toolMagnesium Sulfate Infusion Calculator
Calculates infusion volume and pump rate from a prescribed magnesium sulfate dose.
Open toolMeropenem Dose Calculator
Calculates a clinician-selected meropenem dose calculator dose.
Open toolmg ↔ micrograms Converter
Converts mass between milligrams and micrograms.
Open toolMorphine Dose Calculator
Calculates a clinician-selected weight-based morphine dose.
Open toolParacetamol IV Dose Calculator
Calculates a protocol-selected weight-based intravenous paracetamol dose.
Open toolPhenobarbital Concentration-Targeted Supplemental Dose
Calculates a supplemental phenobarbital amount required to move from a measured concentration to a selected target using an apparent distribution volume.
Open toolPhenobarbital Loading Dose
Calculates a model-based phenobarbital loading dose from body weight, apparent volume of distribution, current concentration and target concentration.
Open toolPiperacillin/Tazobactam Dose Calculator
Calculates a clinician-selected piperacillin/tazobactam dose calculator dose.
Open toolProportional Maintenance Dose Adjustment
Calculates a proportional new maintenance dose from the current dose, measured concentration and desired concentration.
Open toolTobramycin Extended-Interval Concentration Projection
Projects a measured Tobramycin concentration to a future time using an individual elimination rate constant.
Open toolTobramycin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Tobramycin concentration to a selected peak reference time.
Open toolTobramycin Projected Trough Concentration
Projects a post-distribution Tobramycin concentration forward to the end of the dosing interval.
Open toolTobramycin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Tobramycin from two post-distribution serum concentrations and their sampling times.
Open toolTobramycin Two-Level Half-Life
Calculates the apparent elimination half-life of Tobramycin from two post-distribution concentrations.
Open toolTwo-Level Elimination Rate Constant
Calculates a first-order elimination rate constant from two post-distribution concentrations and their sampling times.
Open toolVancomycin Extrapolated Post-Distribution Peak
Back-extrapolates a measured vancomycin concentration to a selected post-infusion reference time.
Open toolVancomycin Loading Dose
Calculates a protocol-selected weight-based vancomycin loading dose
Open toolVancomycin Maintenance Dose
Calculates a protocol-selected weight-based vancomycin maintenance dose
Open toolVancomycin Projected Trough Concentration
Projects a measured vancomycin concentration to the end of the dosing interval.
Open toolVancomycin Trapezoidal AUC24 Estimate
Estimates vancomycin AUC24 from a post-distribution peak, trough, elimination rate constant, infusion duration and dosing interval using a one-compartment first-order method.
Open toolVancomycin Two-Level Elimination Rate Constant
Calculates a vancomycin elimination rate constant from two post-distribution concentrations.
Open toolVancomycin Two-Level Half-Life
Calculates apparent vancomycin half-life from two post-distribution concentrations.
Open toolCritical Care
71 toolsAdult Ventilator Reference Values
Provides concise adult invasive ventilation reference concepts.
Open toolAlbumin Weak-Acid Charge
Estimates the negative charge contributed by albumin at a specified pH for Stewart acid–base analysis.
Open toolAPACHE II Score
Calculates APACHE II illness-severity points from acute physiology, age and chronic health status.
Open toolAPACHE III Score
Records and interprets a completed APACHE III score.
Open toolApparent Strong Ion Difference
Calculates the apparent strong ion difference using major measured strong ions and lactate.
Open toolArterial Oxygen Content (Expanded Equation)
Calculates arterial oxygen content from haemoglobin, arterial saturation and dissolved oxygen.
Open toolArteriovenous Oxygen Content Difference
Calculates the arterial–venous oxygen content difference.
Open toolBase Excess by Van Slyke Equation
Calculates an approximate standard base excess from pH and bicarbonate.
Open toolBehavioural Pain Scale
Assesses pain-related behaviour in mechanically ventilated adults.
Open toolCalculated Base Deficit
Calculates base deficit as the negative of base excess.
Open toolCalculated Bicarbonate
Calculates bicarbonate from pH and PaCO₂ using the Henderson–Hasselbalch relationship.
Open toolCalculated Bicarbonate from pH and PaCO₂
Calculates bicarbonate from pH and arterial carbon dioxide tension using Henderson–Hasselbalch.
Open toolCalculated PaCO₂ from pH and Bicarbonate
Calculates arterial carbon dioxide tension from pH and bicarbonate using Henderson–Hasselbalch.
Open toolCerebral Perfusion Pressure
Calculates cerebral perfusion pressure from mean arterial pressure and intracranial pressure.
Open toolChloride Corrected for Sodium
Normalises measured chloride to a reference sodium concentration to assess relative hyperchloraemia or hypochloraemia.
Open toolCorrected Minute Ventilation
Calculates corrected minute ventilation using measured minute ventilation and PaCO₂.
Open toolCritical-Care Pain Observation Tool
Observational pain assessment for critically ill adults unable to self-report.
Open toolDead Space Fraction (Enghoff Modification)
Calculates the Enghoff modification of dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolDelta Gap
Calculates the increase in anion gap above a reference value of 12 mmol/L.
Open toolDiastolic Shock Index
Calculates heart rate divided by diastolic blood pressure as an adjunctive marker of vasodilatory shock.
Open toolDriving Pressure Calculator
Calculates respiratory-system driving pressure from plateau pressure and total PEEP.
Open toolEffective Strong Ion Difference
Calculates effective strong ion difference from bicarbonate plus albumin and phosphate weak-acid charges.
Open toolExpected Bicarbonate in Acute Respiratory Acidosis
Calculates expected bicarbonate for acute respiratory acidosis.
Open toolExpected Bicarbonate in Acute Respiratory Alkalosis
Calculates expected bicarbonate for acute respiratory alkalosis.
Open toolExpected Bicarbonate in Chronic Respiratory Acidosis
Calculates expected bicarbonate for chronic respiratory acidosis.
Open toolExpected Bicarbonate in Chronic Respiratory Alkalosis
Calculates expected bicarbonate for chronic respiratory alkalosis.
Open toolExpected PaCO₂ in Metabolic Acidosis
Calculates expected respiratory compensation in metabolic acidosis using Winter's formula.
Open toolExpected PaCO₂ in Metabolic Alkalosis
Calculates the expected PaCO₂ range for respiratory compensation in metabolic alkalosis.
Open toolHenderson–Hasselbalch pH
Calculates pH from bicarbonate and arterial carbon dioxide tension.
Open toolInspiratory-to-Expiratory Ratio
Calculates the inspiratory-to-expiratory time ratio from inspiratory time and respiratory rate.
Open toolLactate Clearance Calculator
Calculates percentage lactate clearance between an initial and repeat measurement.
Open toolLactate to Albumin Ratio
Calculates the serum lactate to albumin ratio.
Open toolMean Airway Pressure
Estimates mean airway pressure from peak inspiratory pressure, PEEP, inspiratory time and total respiratory-cycle time.
Open toolMechanical Energy per Breath
Estimates mechanical energy delivered per breath during volume-controlled ventilation.
Open toolMinute Ventilation
Calculates minute ventilation from tidal volume and respiratory rate.
Open toolMixed Venous Oxygen Content
Calculates mixed venous oxygen content from haemoglobin, mixed venous saturation and venous oxygen tension.
Open toolModified Early Warning Score (MEWS)
Calculates a Modified Early Warning Score from systolic blood pressure, heart rate, respiratory rate, temperature and consciousness.
Open toolModified NUTRIC Score
Records and interprets a completed modified NUTRIC score without IL-6.
Open toolMurray Lung Injury Score
Quantifies acute lung injury from chest radiograph, hypoxaemia, PEEP and respiratory-system compliance.
Open toolNUTRIC Score
Records and interprets a completed Nutrition Risk in the Critically Ill score.
Open toolOxygen Consumption by Fick Principle
Calculates oxygen consumption from cardiac output and arterial–venous oxygen content difference.
Open toolOxygen Consumption Index (VO₂I)
Calculates indexed systemic oxygen consumption from cardiac index and the arterial–venous oxygen-content difference using the Fick principle.
Open toolOxygen Delivery Index
Calculates indexed systemic oxygen delivery from cardiac index and arterial oxygen content.
Open toolOxygen Extraction Ratio
Calculates the proportion of delivered oxygen extracted by tissues.
Open toolOxygen Saturation Index
Calculates oxygen saturation index from FiO₂, mean airway pressure and SpO₂.
Open toolOxygenation Index
Calculates oxygenation index from FiO₂, mean airway pressure and PaO₂.
Open toolPaO₂/FiO₂ Ratio
Calculates the arterial oxygen tension to inspired oxygen fraction ratio.
Open toolPassive Leg Raise Cardiac Output Change
Calculates percentage change in cardiac output or stroke volume during a passive leg raise.
Open toolPhosphate Weak-Acid Charge
Estimates the negative charge contributed by inorganic phosphate at a specified pH.
Open toolPulse Pressure Variation
Calculates respiratory pulse-pressure variation from maximum and minimum arterial pulse pressure.
Open toolRespiratory System Stress Index
Calculates a simplified stress index from three airway-pressure measurements during constant-flow inflation.
Open toolRichmond Agitation-Sedation Scale (RASS)
Grades agitation and sedation from +4 to −5 using the Richmond Agitation-Sedation Scale.
Open toolROX Index
Calculates the ROX Index from oxygen saturation, inspired oxygen fraction and respiratory rate.
Open toolROX–Heart Rate Index
Calculates a heart-rate-adjusted ROX index from oxygen saturation, inspired oxygen, respiratory rate and heart rate.
Open toolSAPS 3 Score
Converts a completed SAPS 3 admission score into the global model mortality estimate.
Open toolSAPS II Score
Converts a completed SAPS II total into the original model mortality estimate.
Open toolSepsis-Induced Coagulopathy (SIC) Score
Calculates the SIC score from platelet count, PT-INR and the four-organ SOFA component score.
Open toolSimplified Strong Ion Difference
Calculates a simplified plasma strong ion difference from sodium, potassium and chloride.
Open toolSIRS Criteria
Counts systemic inflammatory response syndrome criteria from temperature, pulse, respiration and white cell findings.
Open toolSodium–Chloride Difference
Calculates the numerical difference between serum sodium and chloride as a simple chloride-related acid–base marker.
Open toolSOFA Score
Assess dysfunction across six organ systems using the Sequential Organ Failure Assessment score.
Open toolStroke Volume Variation
Calculates respiratory stroke-volume variation from maximum and minimum stroke volume.
Open toolStrong Ion Gap
Calculates the strong ion gap from apparent strong ion difference, bicarbonate, albumin and phosphate.
Open toolSystemic Oxygen Consumption
Calculates systemic oxygen consumption from cardiac output and arteriovenous oxygen content difference.
Open toolSystemic Oxygen Delivery
Calculates systemic oxygen delivery from cardiac output and arterial oxygen content.
Open toolSystemic Perfusion Pressure Gradient
Calculates the systemic perfusion pressure gradient from mean arterial and central venous pressures.
Open toolSystemic Vascular Resistance Index
Calculates indexed systemic vascular resistance from mean arterial pressure, central venous pressure and cardiac index.
Open toolVasoactive-Inotropic Score
Calculates the vasoactive-inotropic score from current infusion rates.
Open toolVenous Oxygen Content
Calculates venous oxygen content from haemoglobin, venous oxygen saturation and venous oxygen tension.
Open toolVentilatory Ratio
Calculates ventilatory ratio.
Open toolWinter’s Formula
Calculates the expected PaCO₂ range for respiratory compensation in metabolic acidosis.
Open toolDermatology
5 toolsALT-70 Cellulitis Score
Supports differentiation of lower-extremity cellulitis from pseudocellulitis.
Open toolEczema Area and Severity Index
Quantifies the extent and clinical severity of atopic dermatitis.
Open toolPsoriasis Area and Severity Index
Quantifies psoriasis severity from lesion features and affected body surface area.
Open toolRegiSCAR DRESS Validation Score
Supports classification of suspected drug reaction with eosinophilia and systemic symptoms.
Open toolSCORTEN for Epidermal Necrolysis
Estimates mortality risk in Stevens–Johnson syndrome and toxic epidermal necrolysis.
Open toolEmergency Medicine
38 toolsAbbreviated Burn Severity Index (ABSI)
Stratifies burn severity using age, sex, TBSA, inhalation injury and full-thickness burn.
Open toolAge Shock Index
Calculates age multiplied by conventional shock index.
Open toolAge-Adjusted D-Dimer Threshold
Calculates the age-adjusted D-dimer threshold for patients aged over 50 years.
Open toolAge-Modified Shock Index
Calculates age multiplied by the modified shock index.
Open toolBelgian Outcome in Burn Injury (BOBI) Score
Stratifies mortality risk after burn injury using age, TBSA and inhalation injury.
Open toolBoston Syncope Criteria
Identifies high-risk features in adults presenting with syncope.
Open toolCanadian C-Spine Rule
Applies the Canadian C-Spine Rule to support cervical spine imaging decisions in alert, stable trauma patients.
Open toolCanadian CT Head Rule
Applies the Canadian CT Head Rule high- and medium-risk criteria in eligible adults with minor head injury.
Open toolCanadian Syncope Risk Score
Predicts 30-day serious outcomes after emergency department assessment of syncope.
Open toolCIWA-Ar Alcohol Withdrawal Scale
Quantifies alcohol withdrawal severity to support monitored treatment.
Open toolClinical Opiate Withdrawal Scale
Rates common signs and symptoms of opioid withdrawal.
Open toolEffective Serum Osmolality
Calculates effective serum osmolality, or tonicity, from serum sodium and glucose while excluding urea.
Open toolEGSYS Score for Syncope
Estimates the likelihood of a cardiac cause of syncope.
Open toolGlasgow Coma Scale
Assess level of consciousness from the best eye, verbal and motor responses.
Open toolHestia Criteria
Identifies exclusion criteria for outpatient treatment of confirmed acute pulmonary embolism.
Open toolHunter Serotonin Toxicity Criteria
Applies the Hunter decision rules in a patient exposed to a serotonergic agent.
Open toolMangled Extremity Severity Score
Calculates the Mangled Extremity Severity Score from skeletal injury, limb ischaemia, shock and age.
Open toolMEDS Sepsis Score
Estimates short-term mortality risk among emergency-department patients with suspected infection.
Open toolModified Shock Index
Calculates heart rate divided by mean arterial pressure.
Open toolNew Orleans Head CT Criteria
Identifies adults with minor head injury who require CT assessment under the New Orleans criteria.
Open toolNEXUS Cervical Spine Criteria
Applies the NEXUS low-risk criteria to support decisions about cervical spine imaging after blunt trauma.
Open toolNEXUS Chest Decision Instrument
Identifies blunt-trauma patients who may require chest imaging using the NEXUS Chest criteria.
Open toolOESIL Score for Syncope
Estimates 12-month mortality after syncope using four clinical predictors.
Open toolOsmolal Gap (SI Units)
Calculates the osmolal gap from measured and calculated serum osmolality using SI units.
Open toolOttawa Ankle Rules
Assesses whether ankle or foot radiography is indicated after an acute injury using the Ottawa Ankle Rules.
Open toolOttawa Knee Rule
Applies the Ottawa Knee Rule after acute knee injury.
Open toolPERC Rule
Apply the eight Pulmonary Embolism Rule-out Criteria in adults with a clinician-assessed low pretest probability of pulmonary embolism.
Open toolPittsburgh Knee Rule
Applies the Pittsburgh Knee Rule after blunt trauma or a fall.
Open toolPulmonary Embolism Severity Index (PESI)
Risk-stratifies patients with acute pulmonary embolism using the original Pulmonary Embolism Severity Index.
Open toolRevised Baux Score
Estimates burn mortality risk from age, total body surface area burned and inhalation injury.
Open toolRevised Geneva Score
Estimates pre-test probability of pulmonary embolism using objective clinical variables.
Open toolRevised Trauma Score
Calculates the triage and weighted Revised Trauma Score from Glasgow Coma Scale, systolic blood pressure and respiratory rate.
Open toolROSE Rule for Syncope
Screens for one-month serious outcome or death after emergency-department syncope.
Open toolSan Francisco Syncope Rule
Screens for short-term serious outcome risk after syncope using the CHESS criteria.
Open toolShock Index
Calculates heart rate divided by systolic blood pressure as a rapid marker of haemodynamic compromise.
Open toolSimplified PESI (sPESI)
Estimates 30-day mortality risk in acute pulmonary embolism using the simplified Pulmonary Embolism Severity Index.
Open toolSTONE Score for Ureteral Stone
Estimates the likelihood of uncomplicated ureteral stone in selected adults with flank pain.
Open toolYEARS Algorithm
Applies the YEARS pulmonary embolism diagnostic criteria with the appropriate D-dimer threshold.
Open toolEndocrinology
20 toolsAdult Diabetic Ketoacidosis Severity Classification
Classifies adult diabetic ketoacidosis severity from arterial or venous pH, bicarbonate and mental status.
Open toolAlbumin-Corrected Fructosamine
Calculates an albumin-corrected fructosamine value.
Open toolBurch-Wartofsky Point Scale
Calculates the Burch-Wartofsky Point Scale for suspected thyroid storm.
Open toolC-Peptide to Glucose Ratio
Calculates a fasting or stimulated C-peptide-to-glucose ratio as a marker of endogenous insulin secretion.
Open toolCalcium–Creatinine Clearance Ratio
Calculates the calcium–creatinine clearance ratio used in hypercalcaemia assessment.
Open toolCorrected Sodium for Hyperglycaemia
Estimates corrected serum sodium in hyperglycaemia.
Open toolCorrected Sodium for Hyperglycaemia (Hillier)
Calculates serum sodium corrected for hyperglycaemia using the Hillier correction factor.
Open toolEstimated Average Glucose from HbA1c
Estimates average glucose from glycated haemoglobin.
Open toolFree Androgen Index
Calculates the free androgen index from total testosterone and sex hormone-binding globulin.
Open toolHOMA-Beta Cell Function
Estimates pancreatic beta-cell function from fasting glucose and insulin using the original HOMA equation.
Open toolHOMA-IR Calculator
Calculates HOMA-IR from fasting glucose and fasting insulin.
Open toolInsulinogenic Index
Estimates early-phase insulin secretion from fasting and 30-minute oral glucose tolerance test values.
Open toolMatsuda Insulin Sensitivity Index
Calculates the Matsuda whole-body insulin sensitivity index from oral glucose tolerance test measurements.
Open toolModified Ferriman-Gallwey Score
Quantifies terminal hair growth across nine androgen-sensitive body areas when assessing hirsutism.
Open toolOral Disposition Index
Combines insulin sensitivity and insulin secretion estimates to describe beta-cell compensation.
Open toolQUICKI Insulin Sensitivity Index
Calculates the quantitative insulin sensitivity check index from fasting insulin and glucose.
Open toolTriglyceride-to-HDL Cholesterol Ratio
Calculates the triglyceride-to-HDL cholesterol ratio.
Open toolTriglyceride–Glucose Index
Calculates the TyG index from fasting triglycerides and fasting glucose.
Open toolTyG–BMI Index
Combines the triglyceride–glucose index with body mass index.
Open toolUrine C-Peptide–Creatinine Ratio
Calculates urine C-peptide to creatinine ratio as a marker of endogenous insulin secretion.
Open toolEndocrinology / General Medicine
1 toolsGastroenterology
8 toolsAIMS65 Score
Estimates inpatient mortality risk in acute upper gastrointestinal bleeding using five variables.
Open toolBISAP Score
Calculates the Bedside Index for Severity in Acute Pancreatitis during the first 24 hours.
Open toolBristol Stool Form Scale
Classifies stool form from type 1 to type 7 using the Bristol Stool Form Scale.
Open toolFull Rockall Score
Calculates the full Rockall score for upper gastrointestinal bleeding using clinical and endoscopic findings.
Open toolGlasgow-Blatchford Bleeding Score
Risk-stratifies upper gastrointestinal bleeding before endoscopy using clinical and laboratory variables.
Open toolGlasgow-Imrie Score
Calculates the Glasgow-Imrie severity score for acute pancreatitis.
Open toolOakland Score
Records and interprets a completed Oakland Score for acute lower gastrointestinal bleeding.
Open toolRanson's Criteria
Calculates Ranson criteria for severity assessment in non-gallstone acute pancreatitis.
Open toolGeneral Medicine
70 toolsAdjusted Ideal Body Weight
Calculates adjusted body weight from actual and ideal body weight using a 0.4 correction factor.
Open toolAdult Pain Score Reference
Provides concise numeric, visual analogue and verbal pain-scale references.
Open toolAdult Routine Maintenance Chloride Requirement
Calculates the NICE adult routine maintenance chloride target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Potassium Requirement
Calculates the NICE adult routine maintenance potassium target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Sodium Requirement
Calculates the NICE adult routine maintenance sodium target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Water Requirement
Calculates the NICE adult routine maintenance water range of 25–30 mL/kg/day.
Open toolAggregate Index of Systemic Inflammation
Calculates the aggregate index of systemic inflammation from neutrophils, monocytes, platelets and lymphocytes.
Open toolAlbumin-Corrected Anion Gap
Corrects the serum anion gap for albumin concentration.
Open toolAlbumin/Globulin Ratio Calculator
Calculates the albumin-to-globulin ratio from albumin and total protein.
Open toolaltered_mentation
Provides the altered_mentation clinical calculation or assessment.
Open toolAnion Gap
Calculates the serum anion gap with or without potassium.
Open toolAUDIT-C Alcohol Screen
Three-item alcohol use screening score.
Open toolBicarbonate Deficit
Estimates bicarbonate deficit.
Open toolBody Fat Percentage Calculator
Estimates adult body fat percentage from BMI, age and sex using the Deurenberg equation.
Open toolBody Mass Index (BMI)
Calculates adult body mass index from height and weight and provides the corresponding adult BMI category.
Open toolBody Surface Area
Calculates body surface area using the Mosteller formula.
Open toolBraden Scale
Assesses adult pressure injury risk across six Braden subscales.
Open toolC-Reactive Protein to Albumin Ratio
Calculates the C-reactive protein to albumin ratio using matched laboratory units.
Open toolCAGE Alcohol Screen
Four-question screen for problematic alcohol use.
Open toolCalculated Serum Osmolality
Calculates estimated serum osmolality from sodium, glucose and blood urea nitrogen.
Open toolCalculated Serum Osmolality (SI Units)
Calculates estimated serum osmolality from sodium, glucose and urea in SI units.
Open toolCelsius ↔ Fahrenheit Converter
Converts temperature between Celsius and Fahrenheit
Open toolCentor / McIsaac Score
Estimates the likelihood of group A streptococcal pharyngitis using modified Centor criteria.
Open toolCharlson Comorbidity Index
Calculates the Charlson Comorbidity Index with age adjustment.
Open toolChloride-to-Sodium Ratio
Calculates the serum chloride-to-sodium ratio as a simplified acid–base screening measure.
Open toolcm ↔ ft/in Converter
Converts height between centimetres and feet/inches.
Open toolCommon Electrolyte Reference Values
Provides illustrative adult reference intervals for common electrolytes.
Open toolconfusion
Clinical calculator for CURB65Score.
Open toolDelta Ratio
Calculates the delta ratio to support assessment of mixed metabolic acid–base disorders.
Open toolElectrolyte Infusion Delivery Rate
Calculates hourly electrolyte delivery from concentration and fluid infusion rate.
Open toolEstimated Blood Volume (Nadler)
Estimates adult blood volume using sex, height and weight.
Open toolFagerström Test for Nicotine Dependence
Estimates the intensity of physical nicotine dependence.
Open toolGlucose to Lymphocyte Ratio
Calculates blood glucose divided by absolute lymphocyte count.
Open toolIdeal Body Weight
Calculates ideal body weight using the Devine formula.
Open toolIdeal Body Weight (Devine, Metric)
Calculates Devine ideal body weight from sex and height.
Open toolIMPROVE Bleeding Risk Score
Estimates in-hospital bleeding risk in acutely ill medical patients considered for thromboprophylaxis.
Open toolIMPROVE VTE Risk Score
Estimates venous thromboembolism risk in acutely ill hospitalised medical patients.
Open toolInfusate Chloride Load
Calculates chloride delivered by an intravenous fluid from concentration and volume.
Open toolInfusate Potassium Load
Calculates potassium delivered by an intravenous fluid or infusion from concentration and volume.
Open toolInfusate Sodium Load
Calculates the sodium dose delivered by an intravenous fluid from concentration and volume.
Open toolkg ↔ lb ↔ stone Converter
Converts weight between kilograms, pounds and stones
Open toolLean Body Mass Calculator
Estimates adult lean body mass using the Hume equations.
Open toolLean Body Weight (Boer)
Calculates lean body weight using the Boer equation.
Open toolLean Body Weight (Hume)
Calculates lean body weight using the Hume equation.
Open toolLean Body Weight (James)
Calculates lean body weight using the James equation.
Open toolMean Arterial Pressure (MAP)
Calculates estimated mean arterial pressure from systolic and diastolic blood pressure.
Open toolMean Arterial Pressure from Systolic and Diastolic Pressure
Estimates mean arterial pressure from systolic and diastolic blood pressure.
Open toolmL ↔ fl oz Converter
Converts millilitres and US or UK imperial fluid ounces.
Open toolmmHg ↔ kPa Converter
Converts pressure between millimetres of mercury and kilopascals.
Open toolmmol/L ↔ mEq/L Converter
Converts mmol/L and mEq/L using the selected ionic valence.
Open toolmmol/L ↔ mg/dL Converter
Converts glucose between mmol/L and mg/dL.
Open toolMonocyte to Lymphocyte Ratio
Calculates the absolute monocyte-to-lymphocyte ratio.
Open toolMorse Fall Scale
Assesses inpatient fall risk using six Morse Fall Scale domains.
Open toolNeutrophil to Albumin Ratio
Calculates the absolute neutrophil count to albumin ratio.
Open toolNormal Adult Vital Signs
Provides commonly used resting adult vital-sign reference ranges
Open toolNormal Laboratory Reference Ranges
Shows illustrative adult laboratory reference intervals.
Open toolNorton Scale
Assesses pressure-injury risk across physical condition, mental condition, activity, mobility and incontinence.
Open toolOsmolar Gap Calculator
Calculates the osmolar gap from measured and calculated serum osmolality.
Open tooloxygen_scale
Clinical calculator for oxygen_scale.
Open toolPadua Prediction Score
Assesses venous thromboembolism risk in hospitalised medical patients.
Open toolPERCRule
Clinical calculator for PERCRule.
Open toolrisk_factors
Learn how each risk factor contributes to stroke risk assessment in atrial fibrillation.
Open toolS O F A Score
Provides the S O F A Score clinical calculation or assessment.
Open toolSerum Globulin Calculator
Calculates serum globulin from total protein and albumin.
Open toolTotal Body Water (Watson)
Estimates total body water using the Watson sex-specific equation.
Open toolUrea to Albumin Ratio
Calculates the blood urea to albumin ratio.
Open toolWaterlow Score
Assesses pressure-ulcer risk using the Waterlow risk-assessment domains.
Open toolWells Score For DVT
Provides the criteria clinical calculation or assessment.
Open toolWells Score For PE
Provides the criteria clinical calculation or assessment.
Open toolµmol/L ↔ mg/dL Converter
Converts selected laboratory analytes between µmol/L and mg/dL.
Open toolGeneral Medicine / Clinical Pharmacology
2 toolsGeriatrics
11 tools4AT Rapid Delirium Assessment
Rapid screening instrument for delirium and cognitive impairment.
Open toolBarthel Index
Measures performance in ten activities of daily living.
Open toolClinical Frailty Scale
Classifies baseline fitness and frailty from 1 to 9 using the Clinical Frailty Scale.
Open toolConfusion Assessment Method (CAM)
Applies the four-feature Confusion Assessment Method algorithm for delirium screening.
Open toolGeriatric Nutritional Risk Index
Calculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Open toolHendrich II Fall Risk Model
Estimates inpatient fall risk using eight weighted factors.
Open toolKatz Index of Independence in Activities of Daily Living
Assesses independence in six basic activities of daily living.
Open toolLawton Instrumental Activities of Daily Living Scale
Assesses independence in instrumental activities required for community living.
Open toolMini Nutritional Assessment – Short Form (MNA-SF)
Screens older adults for malnutrition using the six-item MNA Short Form.
Open toolSARC-F Sarcopenia Screen
Five-item screen for risk of sarcopenia.
Open toolSTRATIFY Falls Risk Assessment
Five-item inpatient falls risk assessment tool.
Open toolHaematology
49 tools4Ts Score for Heparin-Induced Thrombocytopenia
Estimates pre-test probability of immune heparin-induced thrombocytopenia.
Open tool4Ts Score for HIT
Calculates the 4Ts score for heparin-induced thrombocytopenia.
Open toolAbsolute Eosinophil Count
Calculates absolute eosinophil count.
Open toolAbsolute Lymphocyte Count
Calculates the absolute lymphocyte count from total white blood cell count and lymphocyte percentage.
Open toolAbsolute Monocyte Count
Calculates the absolute monocyte count from total white blood cell count and monocyte percentage.
Open toolAbsolute Neutrophil Count
Calculates absolute neutrophil count.
Open toolCentral Nervous System International Prognostic Index (CNS-IPI)
Calculates CNS-IPI for diffuse large B-cell lymphoma using the five IPI factors plus kidney or adrenal involvement.
Open toolCLL International Prognostic Index (CLL-IPI)
Calculates CLL-IPI using TP53 status, IGHV mutation status, beta-2 microglobulin, clinical stage and age.
Open toolCorrected Reticulocyte Count
Calculates corrected reticulocyte percentage from patient and reference haematocrit.
Open toolCorrected White Cell Count for Nucleated Red Blood Cells
Corrects an automated white blood cell count when nucleated red blood cells are included in the reported count.
Open toolDASH Score for VTE Recurrence
Estimates recurrence risk after a first unprovoked venous thromboembolism.
Open toolDIPSS-Plus for Primary Myelofibrosis
Calculates DIPSS-Plus from DIPSS category, karyotype, platelet count and red-cell transfusion dependence.
Open toolDynamic International Prognostic Scoring System (DIPSS)
Calculates DIPSS risk for primary myelofibrosis at any point during the disease course.
Open toolEngland and Fraser Index
Calculates the England and Fraser red-cell discrimination index.
Open toolEUTOS Long-Term Survival (ELTS) Score
Calculates the ELTS score for chronic myeloid leukaemia from age, spleen size, peripheral-blood blasts and platelet count.
Open toolEUTOS Score for Chronic Myeloid Leukaemia
Calculates EUTOS risk from spleen size and basophil percentage.
Open toolFactor IX Dose Estimator
Estimates factor IX units required to achieve a target rise.
Open toolFactor VIII Dose Estimator
Estimates factor VIII units required to achieve a target rise.
Open toolFollicular Lymphoma International Prognostic Index (FLIPI)
Calculates FLIPI risk from age, stage, haemoglobin, LDH and involved nodal areas.
Open toolFollicular Lymphoma International Prognostic Index 2 (FLIPI2)
Calculates FLIPI2 from age, beta-2 microglobulin, haemoglobin, largest lymph-node diameter and bone-marrow involvement.
Open toolGlobal Antiphospholipid Syndrome Score (GAPSS)
Estimates thrombotic and pregnancy morbidity risk in antiphospholipid syndrome.
Open toolHematopoietic Cell Transplantation Comorbidity Index (HCT-CI)
Calculates the HCT-CI from pre-transplant comorbidities to support allogeneic transplant risk assessment.
Open toolHERDOO2 Rule
Identifies women with first unprovoked VTE who may be at low recurrence risk after treatment.
Open toolHLH-2004 Diagnostic Criteria
Counts the eight HLH-2004 clinical and laboratory diagnostic criteria.
Open toolHScore for Reactive Haemophagocytic Syndrome
Estimates the probability of reactive haemophagocytic syndrome from nine weighted clinical, laboratory and marrow variables.
Open toolInternational Prognostic Index (IPI)
Calculates the International Prognostic Index for aggressive non-Hodgkin lymphoma.
Open toolInternational Prognostic Scoring System for Waldenström Macroglobulinaemia (IPSSWM)
Calculates IPSSWM risk using age, haemoglobin, platelet count, beta-2 microglobulin and monoclonal IgM concentration.
Open toolInternational Staging System for Multiple Myeloma (ISS)
Assigns ISS stage for newly diagnosed multiple myeloma from serum beta-2 microglobulin and albumin.
Open toolISTH Overt DIC Score
Records and interprets a completed ISTH overt DIC score.
Open toolLymphocyte-to-Monocyte Ratio
Calculates the lymphocyte-to-monocyte ratio.
Open toolMALT Lymphoma International Prognostic Index (MALT-IPI)
Calculates MALT-IPI from age, serum LDH and Ann Arbor stage.
Open toolMantle Cell Lymphoma International Prognostic Index (MIPI)
Calculates the continuous MIPI from age, ECOG performance status, LDH ratio and white-cell count.
Open toolMentzer Index
Calculates the Mentzer index.
Open toolNeutrophil-to-Lymphocyte Ratio
Calculates the neutrophil-to-lymphocyte ratio.
Open toolPLASMIC Score
Calculates the PLASMIC score in suspected thrombotic microangiopathy.
Open toolPlatelet-to-Lymphocyte Ratio
Calculates the platelet-to-lymphocyte ratio.
Open toolRed Cell Distribution Width Index
Calculates the RDW Index from MCV, RDW and red blood cell count.
Open toolReticulocyte Production Index
Calculates a reticulocyte production index.
Open toolRevised International Prognostic Scoring System for MDS (IPSS-R)
Calculates the IPSS-R prognostic score and risk category for untreated primary myelodysplastic syndromes.
Open toolRevised International Staging System for Multiple Myeloma (R-ISS)
Assigns R-ISS stage using ISS stage, LDH and high-risk cytogenetic abnormalities.
Open toolRevised IPSET-Thrombosis for Essential Thrombocythaemia
Classifies thrombosis risk in essential thrombocythaemia using age, thrombosis history and JAK2 V617F mutation status.
Open toolSecond Revision of the International Staging System for Multiple Myeloma (R2-ISS)
Calculates R2-ISS stage using ISS, LDH, del(17p), t(4;14) and 1q gain or amplification.
Open toolShine and Lal Index
Calculates the Shine and Lal red-cell discrimination index.
Open toolSokal Score for Chronic Myeloid Leukaemia
Calculates the Sokal prognostic score at CML diagnosis.
Open toolSystemic Immune-Inflammation Index
Calculates the systemic immune-inflammation index from platelets, neutrophils and lymphocytes.
Open toolTotal Iron-Binding Capacity from Transferrin
Estimates total iron-binding capacity from serum transferrin.
Open toolTransferrin Saturation
Calculates transferrin saturation from serum iron and total iron-binding capacity.
Open toolUnsaturated Iron-Binding Capacity
Calculates unsaturated iron-binding capacity from TIBC and serum iron.
Open toolVTE-BLEED Score
Estimates bleeding risk during stable anticoagulation after venous thromboembolism.
Open toolHepatology
32 toolsALBI Score
Calculates the albumin-bilirubin score.
Open toolAlbumin–Bilirubin (ALBI) Score
Calculates the ALBI score from serum albumin and bilirubin.
Open toolAST to ALT Ratio
Calculates the aspartate aminotransferase to alanine aminotransferase ratio.
Open toolAST to Platelet Ratio Index
Calculates APRI from AST, the laboratory AST upper limit and platelet count.
Open toolAST/ALT (De Ritis) Ratio
Calculates the ratio of aspartate aminotransferase to alanine aminotransferase.
Open toolBARD Score
Calculates the BARD score for advanced fibrosis risk in NAFLD.
Open toolBaveno VI Variceal Screening Criteria
Identifies compensated advanced chronic liver disease patients who may avoid screening endoscopy using liver stiffness and platelet count.
Open toolChild-Pugh Score
Classifies cirrhosis severity using bilirubin, albumin, INR, ascites and hepatic encephalopathy.
Open toolCLIF-C ACLF Score
Estimates mortality in acute-on-chronic liver failure using CLIF organ-failure score, age and white-cell count.
Open toolCLIF-C Acute Decompensation Score
Estimates mortality in acutely decompensated cirrhosis without ACLF.
Open toolDe Ritis Ratio
Calculates the AST to ALT ratio.
Open toolFIB-4 Index
Calculates the FIB-4 index from age, AST, ALT and platelet count.
Open toolFIB-4 Index
Calculates FIB-4 from age, AST, ALT and platelet count.
Open toolForns Fibrosis Score
Calculates the Forns index from age, platelet count, GGT and cholesterol.
Open toolGlasgow Alcoholic Hepatitis Score
Records and interprets a completed Glasgow Alcoholic Hepatitis Score.
Open toolHepatic Steatosis Index
Calculates the hepatic steatosis index from ALT/AST ratio, BMI, sex and diabetes status.
Open toolIntegrated MELD (iMELD)
Calculates integrated MELD using MELD, age and sodium.
Open toolKing\
Applies the classic King’s College Criteria for paracetamol-related acute liver failure.
Open toolKing\
Applies the classic King’s College Criteria for non-paracetamol acute liver failure.
Open toolLille Score
Estimates corticosteroid response after treatment for severe alcohol-associated hepatitis.
Open toolLiver Frailty Index
Calculates the Liver Frailty Index from grip strength, timed chair stands and balance performance.
Open toolMaddrey Discriminant Function
Calculates Maddrey discriminant function for severity assessment in alcohol-associated hepatitis.
Open toolMELD 3.0 Score
Calculates MELD 3.0 using bilirubin, INR, creatinine, sodium, albumin and sex.
Open toolMELD Score
Calculates the original MELD score from bilirubin, INR and creatinine.
Open toolMELD-Na Score
Calculates the MELD-Na score from bilirubin, INR, creatinine, sodium and recent dialysis status.
Open toolMELD-to-Sodium Ratio (MESO Index)
Calculates the MESO index from MELD and serum sodium.
Open toolMELD-XI Score
Calculates MELD-XI where INR is unavailable or unsuitable.
Open toolNACSELD-ACLF Organ Failure Count
Counts extrahepatic organ failures used to define and grade NACSELD acute-on-chronic liver failure.
Open toolNAFLD Fibrosis Score
Calculates the NAFLD Fibrosis Score from age, BMI, diabetes or impaired fasting glucose, AST/ALT ratio, platelets and albumin.
Open toolPlatelet–Albumin–Bilirubin (PALBI) Grade
Calculates PALBI score and grade from bilirubin, albumin and platelet count.
Open toolR Factor for Liver Injury
Calculates the R factor to classify hepatocellular, cholestatic or mixed liver injury.
Open toolUKELD Score
Calculates the UK Model for End-Stage Liver Disease score.
Open toolInfectious Disease
2 toolsInfectious Diseases
1 toolsNeurology
21 toolsABC/2 Intracerebral Haemorrhage Volume
Estimates intracerebral haemorrhage volume using the ABC/2 method.
Open toolABCD3-I Score for TIA
Estimates early stroke risk after transient ischaemic attack using clinical, dual-event and imaging features.
Open toolABCD² Score
Calculates the ABCD² score from age, initial blood pressure, clinical features, symptom duration and diabetes status.
Open toolAdult Glasgow Coma Scale Reference
Provides a concise adult Glasgow Coma Scale reference
Open toolDRAGON Score for Stroke Outcome
Predicts poor functional outcome after intravenous thrombolysis for acute ischaemic stroke.
Open toolEssen Stroke Risk Score
Estimates recurrent vascular event risk after ischaemic stroke or transient ischaemic attack.
Open toolFUNC Score for Functional Outcome After ICH
Predicts likelihood of functional independence after spontaneous intracerebral haemorrhage.
Open toolHAT Score for Haemorrhage After Thrombolysis
Estimates haemorrhage risk after intravenous thrombolysis for acute ischaemic stroke.
Open toolHIAT2 Score for Poor Outcome After Endovascular Therapy
Predicts poor outcome after intra-arterial/endovascular therapy for acute ischaemic stroke.
Open toolHunt & Hess Scale
Grades clinical severity after aneurysmal subarachnoid haemorrhage.
Open toolHunt and Hess Subarachnoid Haemorrhage Grade
Grades clinical severity of aneurysmal subarachnoid haemorrhage.
Open toolICH Score
Estimates mortality risk after spontaneous intracerebral haemorrhage using five admission variables.
Open toolIntracerebral Haemorrhage Grading Scale
Grades spontaneous intracerebral haemorrhage severity using GCS, age, volume, location and intraventricular extension.
Open toolModified Fisher Scale
Grades subarachnoid haemorrhage CT appearance to estimate risk of delayed cerebral ischaemia.
Open toolModified Graeb Score
Quantifies intraventricular haemorrhage burden across the ventricular system.
Open toolNIH Stroke Scale (NIHSS)
Quantifies neurological impairment in suspected or confirmed acute stroke using the 15 scored NIHSS items.
Open toolNormal Cerebrospinal Fluid Reference Values
Provides illustrative adult cerebrospinal fluid reference values.
Open toolSEDAN Score for Intracranial Haemorrhage
Estimates risk of symptomatic intracranial haemorrhage after intravenous thrombolysis.
Open toolSPAN-100 Index
Flags patients whose age plus NIHSS is at least 100 before thrombolysis.
Open toolTHRIVE Score for Ischaemic Stroke
Predicts outcome and mortality after acute ischaemic stroke using age, NIHSS and comorbidities.
Open toolWFNS Subarachnoid Haemorrhage Grade
Grades aneurysmal subarachnoid haemorrhage using GCS and focal motor deficit.
Open toolNeurology / Critical Care
1 toolsNutrition
8 toolsControlling Nutritional Status (CONUT) Score
Screens nutritional status using albumin, total lymphocyte count and total cholesterol.
Open toolMalnutrition Universal Screening Tool (MUST)
Calculates adult malnutrition risk from BMI, unplanned weight loss and acute-disease effect.
Open toolMifflin–St Jeor Resting Energy Expenditure
Estimates resting energy expenditure from weight, height, age and sex using the Mifflin–St Jeor equation.
Open toolNitrogen Balance
Estimates nitrogen balance from daily protein intake, urinary urea nitrogen and an allowance for non-urinary losses.
Open toolNutritional Risk Screening 2002 (NRS-2002)
Screens hospital patients for nutritional risk using nutritional impairment, disease severity and age.
Open toolPrognostic Nutritional Index
Calculates Onodera prognostic nutritional index from albumin and lymphocyte count.
Open toolRevised Harris–Benedict Resting Energy Expenditure
Estimates resting energy expenditure using the revised Harris–Benedict equations.
Open toolShort Nutritional Assessment Questionnaire
Brief inpatient screen for malnutrition based on weight loss, appetite and supplements/tube feeding.
Open toolObstetrics & Gynaecology
18 toolsAmniotic Fluid Index
Sums the deepest vertical fluid pocket in each of four uterine quadrants.
Open toolBishop Score
Calculates the Bishop cervical score before induction of labour.
Open toolCerebroplacental Ratio
Calculates the fetal middle cerebral artery to umbilical artery pulsatility-index ratio.
Open toolEdinburgh Postnatal Depression Scale
Ten-item screening questionnaire for depressive symptoms during pregnancy and after birth.
Open toolEstimated Due Date
Estimates the expected date of delivery from the first day of the last menstrual period.
Open toolEstimated Due Date by Nägele Rule
Estimates the number of days from the first day of the last menstrual period to the due date.
Open toolGestational Age from Crown–Rump Length
Estimates gestational age from first-trimester crown–rump length using the Robinson–Fleming relationship.
Open toolGestational Age from LMP Interval
Converts elapsed days since the last menstrual period into completed weeks and remaining days.
Open toolHadlock Four-Parameter Estimated Fetal Weight
Estimates fetal weight from biparietal diameter, head circumference, abdominal circumference and femur length using the Hadlock four-parameter equation.
Open toolLEFt Rule for DVT in Pregnancy
Records the three LEFt features associated with DVT in pregnancy.
Open toolMean Gestational Sac Diameter
Calculates mean gestational sac diameter from three orthogonal ultrasound measurements.
Open toolMean Uterine Artery Pulsatility Index
Calculates the mean of right and left uterine-artery pulsatility indices.
Open toolObstetric Shock Index
Calculates shock index from heart rate and systolic blood pressure in an obstetric patient.
Open toolPregnancy Booking BMI
Calculates body mass index from booking weight and height.
Open toolPUQE-24 Score
Grades nausea and vomiting severity during pregnancy over the preceding 24 hours.
Open toolRobson Ten-Group Classification
Classifies women undergoing childbirth into one of ten mutually exclusive obstetric groups.
Open toolShepard Estimated Fetal Weight
Estimates fetal weight from biparietal diameter and abdominal circumference using the Shepard equation.
Open toolSingle Deepest Pocket
Interprets the maximum vertical amniotic-fluid pocket measured by ultrasound.
Open toolOncology
22 toolsAdvanced Lung Cancer Inflammation Index
Calculates the advanced lung cancer inflammation index from BMI, albumin and neutrophil-to-lymphocyte ratio.
Open toolCarboplatin Dose by Calvert Formula
Calculates carboplatin dose from target AUC and measured or estimated GFR.
Open toolCARG Chemotherapy Toxicity Score
Estimates grade 3–5 chemotherapy toxicity risk in adults aged 65 years or older.
Open toolCISNE Score
Calculates the Clinical Index of Stable Febrile Neutropenia in selected adults with solid tumours.
Open toolCNS-IPI for Diffuse Large B-Cell Lymphoma
Estimates risk of central nervous system relapse in diffuse large B-cell lymphoma.
Open toolDeauville Five-Point Scale
Classifies FDG PET uptake relative to mediastinal blood pool and liver in lymphoma response assessment.
Open toolDerived Neutrophil-to-Lymphocyte Ratio
Calculates the derived neutrophil-to-lymphocyte ratio from total white-cell and neutrophil counts.
Open toolECOG Performance Status
Classifies functional status from grade 0 to 5 using the ECOG performance scale.
Open toolG8 Geriatric Oncology Screening Tool
Screens older adults with cancer for vulnerability warranting comprehensive geriatric assessment.
Open toolGlasgow Prognostic Score (GPS)
Calculates the original Glasgow Prognostic Score from CRP and albumin.
Open toolHALP Score
Calculates the haemoglobin, albumin, lymphocyte and platelet (HALP) score.
Open toolIMDC Metastatic Renal Cell Carcinoma Score
Calculates the IMDC risk group for metastatic renal cell carcinoma from six adverse prognostic factors.
Open toolInternational Prognostic Score for Advanced Hodgkin Lymphoma
Counts seven adverse prognostic factors in advanced classical Hodgkin lymphoma.
Open toolInternational Staging System for Multiple Myeloma
Assigns multiple myeloma stage from serum beta-2 microglobulin and albumin.
Open toolKarnofsky Performance Status
Classifies functional performance from 100 to 0 using the Karnofsky Performance Status scale.
Open toolKhorana VTE Risk Score
Estimates venous thromboembolism risk in ambulatory patients starting systemic cancer therapy.
Open toolKhorana VTE Risk Score
Calculates the Khorana score for venous thromboembolism risk in ambulatory patients starting systemic cancer therapy.
Open toolMASCC Risk Index
Calculates the MASCC Risk Index for complications in adults with febrile neutropenia.
Open toolModified Glasgow Prognostic Score
Calculates the modified Glasgow Prognostic Score from CRP and albumin.
Open toolPan-Immune-Inflammation Value
Calculates the pan-immune-inflammation value from neutrophils, monocytes, platelets and lymphocytes.
Open toolRevised International Prognostic Index (R-IPI)
Risk-stratifies patients with diffuse large B-cell lymphoma treated with rituximab-based therapy.
Open toolSystemic Inflammation Response Index
Calculates the systemic inflammation response index from neutrophils, monocytes and lymphocytes.
Open toolOphthalmology
5 toolsDua Ocular Burn Classification
Grades ocular surface burns from limbal and conjunctival involvement.
Open toolMean Ocular Perfusion Pressure
Estimates mean ocular perfusion pressure from blood pressure and intraocular pressure.
Open toolOcular Trauma Score
Estimates visual prognosis after serious ocular trauma.
Open toolRoper–Hall Ocular Burn Classification
Classifies acute ocular surface burns using corneal appearance and limbal ischaemia.
Open toolSnellen and LogMAR Visual Acuity Converter
Converts a Snellen visual-acuity fraction to logMAR and an equivalent decimal acuity.
Open toolOrthopaedics
1 toolsPaediatrics
39 tools4-2-1 Hourly Maintenance Fluids
Calculates traditional hourly paediatric maintenance fluid rate.
Open tool4–2–1 Hourly Maintenance Fluid Rate
Calculates estimated hourly maintenance fluid using the 4–2–1 rule.
Open toolApgar Score
Calculates the Apgar score from appearance, pulse, grimace, activity and respiration.
Open toolBacterial Meningitis Score
Identifies children with CSF pleocytosis at very low risk of bacterial meningitis when strict eligibility criteria are met.
Open toolBedside Schwartz eGFR
Estimates paediatric eGFR using the bedside Schwartz equation.
Open toolCATCH Paediatric Head Injury Rule
Identifies children with minor head injury who may require CT according to the CATCH rule.
Open toolCHALICE Head Injury Rule
Screens children after head injury for CHALICE criteria associated with clinically significant intracranial injury.
Open toolCKiD U25 Combined eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCKiD U25 Creatinine eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCKiD U25 Cystatin C eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCorrected Gestational Age
Calculates corrected age for a child born preterm from chronological age and gestational age at birth.
Open toolCRIB II Score
Estimates early mortality risk in very preterm or very-low-birth-weight infants using birth and admission variables.
Open toolDownes Respiratory Distress Score
Grades neonatal respiratory distress using respiratory rate, cyanosis, air entry, grunting and retractions.
Open toolEstimated Paediatric Blood Volume
Estimates paediatric blood volume from body weight and an age-category coefficient.
Open toolHolliday-Segar Daily Maintenance Fluids
Calculates traditional daily paediatric maintenance fluid volume.
Open toolHolliday–Segar Daily Maintenance Fluid
Calculates estimated daily maintenance fluid using the Holliday–Segar 100/50/20 rule.
Open toolKocher Criteria for Septic Hip
Supports differentiation of septic arthritis from transient synovitis in children with an irritable hip.
Open toolModified Kocher–Caird Criteria
Adds C-reactive protein to the Kocher predictors for paediatric septic hip assessment.
Open toolModified Tal Bronchiolitis Score
Grades bronchiolitis severity in infants using respiratory rate, wheeze, oxygenation and accessory-muscle use.
Open toolNeonatal Glucose Infusion Rate
Calculates glucose delivery in mg/kg/min from dextrose concentration, infusion rate and infant weight.
Open toolNeonatal Respiratory Severity Score
Calculates the product of mean airway pressure and inspired oxygen fraction in ventilated neonates.
Open toolNeonatal Weight Loss Percentage
Calculates percentage weight loss from birth weight in a newborn infant.
Open toolPaediatric Age-Adjusted Shock Index (SIPA)
Calculates paediatric shock index and compares it with commonly used age-adjusted upper thresholds.
Open toolPaediatric Appendicitis Score
Calculates the 10-point Paediatric Appendicitis Score.
Open toolPaediatric Early Warning Score (Brighton PEWS)
Calculates the Brighton Paediatric Early Warning Score from behaviour, cardiovascular and respiratory observations, with two optional additional factors.
Open toolPaediatric Glasgow Coma Scale
Calculates a paediatric-adapted Glasgow Coma Scale score.
Open toolPaediatric Respiratory Assessment Measure
Calculates PRAM asthma-exacerbation severity in children using five clinical findings.
Open toolPECARN Blunt Abdominal Trauma Rule
Identifies children at very low risk of intra-abdominal injury requiring acute intervention after blunt torso trauma.
Open toolPECARN Head Injury Rule – Age 2 Years and Older
Applies the PECARN head trauma prediction rule for children aged 2 years and older.
Open toolPECARN Head Injury Rule – Under 2 Years
Applies the PECARN head trauma prediction rule for children younger than 2 years.
Open toolPediatric Trauma Score
Summarises injury severity in children using weight, airway, blood pressure, CNS status, wounds and skeletal injury.
Open toolPELOD-2 Score
Quantifies paediatric multiple-organ dysfunction using neurologic, cardiovascular, renal, respiratory and haematologic variables.
Open toolRenal Angina Index
Screens critically ill children for risk of severe acute kidney injury by multiplying risk and injury strata.
Open toolRochester Low-Risk Criteria
Classifies selected febrile infants aged 60 days or younger using the original Rochester low-risk criteria.
Open toolSilverman-Andersen Respiratory Severity Score
Grades neonatal respiratory distress using chest movement, retractions, xiphoid retraction, nasal flaring and expiratory grunt.
Open toolSNAPPE-II Score
Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.
Open toolStep-by-Step Febrile Infant Assessment
Risk-stratifies well-defined febrile infants using age, appearance, urinalysis, procalcitonin, CRP and ANC.
Open toolWestley Croup Score
Calculates the Westley score for clinical severity of croup.
Open toolWood-Downes-Ferrés Asthma Score
Grades acute paediatric asthma severity using wheeze, retractions, respiratory rate, heart rate, air entry and cyanosis.
Open toolPalliative Care
4 toolsEdmonton Symptom Assessment System Revised
Rates nine common symptoms in palliative and oncology care on 0–10 scales.
Open toolPain Assessment in Advanced Dementia
Observational pain score for people with advanced dementia who cannot reliably self-report.
Open toolPalliative Performance Scale
Records the Palliative Performance Scale using standard 10% categories.
Open toolPalliative Prognostic Index (PPI)
Estimates short-term survival in advanced illness using PPS, oral intake, oedema, dyspnoea at rest and delirium.
Open toolPsychiatry
4 toolsGAD-7 Anxiety Severity
Assesses generalised anxiety symptom severity over the preceding two weeks.
Open toolInsomnia Severity Index
Assesses perceived insomnia severity and impact over the previous two weeks.
Open toolPHQ-2 Depression Screen
Two-item depression screening instrument covering mood and anhedonia.
Open toolPHQ-9 Depression Severity
Assesses depressive symptom severity over the preceding two weeks.
Open toolRenal
35 toolsAdrogué–Madias Predicted Sodium Change
Estimates the change in serum sodium after one litre of an infusate using the Adrogué–Madias equation.
Open toolCalculated Urine Osmolality
Estimates urine osmolality from urine sodium, potassium and urea.
Open toolCKD-EPI Creatinine–Cystatin C Equation 2021
Calculates race-free eGFR using the 2021 CKD-EPI combined creatinine and cystatin C equation.
Open toolCKD-EPI Cystatin C Equation 2012
Calculates eGFR using the 2012 CKD-EPI cystatin C equation.
Open toolCreatinine Clearance (Salazar–Corcoran)
Estimates creatinine clearance in patients with obesity using the Salazar–Corcoran equation.
Open toolElectrolyte-Free Water Clearance
Calculates electrolyte-free water clearance from urine flow and urine and plasma electrolytes.
Open toolEquilibrated Kt/V
Estimates equilibrated Kt/V from single-pool Kt/V and dialysis duration.
Open toolEstimated Urine Osmolality
Estimates urine osmolality from urine sodium, potassium, urea and glucose.
Open toolFractional Excretion of Bicarbonate
Calculates fractional bicarbonate excretion from paired urine and serum bicarbonate and creatinine measurements.
Open toolFractional Excretion of Chloride
Calculates fractional excretion of chloride from paired urine and serum measurements.
Open toolFractional Excretion of Magnesium
Calculates fractional magnesium excretion using paired serum and urine magnesium and creatinine values.
Open toolFractional Excretion of Potassium
Calculates the percentage of filtered potassium excreted in urine from paired serum and urine potassium and creatinine values.
Open toolFree Water Clearance
Calculates free water clearance from urine flow and osmolal clearance.
Open toolFull Age Spectrum Creatinine eGFR
Estimates eGFR using the Full Age Spectrum creatinine equation.
Open toolFull Age Spectrum Cystatin C eGFR
Estimates eGFR using the Full Age Spectrum cystatin C equation.
Open toolFurosemide Stress Test
Interprets 2-hour urine output after a standardised furosemide challenge in early AKI.
Open toolKidney Failure Risk Equation — 4 Variable
Estimates 2- and 5-year treated kidney failure risk in CKD stages G3–G5.
Open toolMDRD Estimated GFR
Calculates estimated glomerular filtration rate using the four-variable MDRD equation without a race coefficient.
Open toolMeasured Creatinine Clearance
Calculates creatinine clearance from a timed urine collection.
Open toolOsmolal Clearance
Calculates osmolal clearance from urine osmolality, urine flow and plasma osmolality.
Open toolPADUA Nephrometry Score
Standardises preoperative anatomic complexity of renal tumours.
Open toolR.E.N.A.L. Nephrometry Score
Standardises anatomic complexity assessment of a renal mass.
Open toolRenal Failure Index
Calculates the renal failure index from urine sodium and paired urine and plasma creatinine.
Open toolRenal Net Acid Excretion
Calculates net renal acid excretion from urinary ammonium, titratable acid and bicarbonate excretion.
Open toolTimed Urine Creatinine Excretion
Calculates daily creatinine excretion from urine creatinine concentration, volume and collection duration.
Open toolTimed Urine Protein Excretion
Calculates total protein excretion from urine protein concentration and timed urine volume.
Open toolUric Acid Clearance
Calculates uric acid clearance from urine and serum uric acid and timed urine flow.
Open toolUrine Albumin Excretion Rate
Calculates timed urine albumin excretion rate from concentration, collected volume and duration.
Open toolUrine Albumin–Creatinine Ratio
Calculates urine albumin-to-creatinine ratio in mg/mmol.
Open toolUrine Calcium-to-Creatinine Ratio
Calculates the spot urine calcium-to-creatinine ratio from molar concentrations.
Open toolUrine Osmolal Gap
Calculates the urine osmolal gap from measured urine osmolality and major measured urinary solutes.
Open toolUrine Protein–Creatinine Ratio
Calculates a spot urine protein-to-creatinine ratio in mg/g.
Open toolUrine Sodium-to-Potassium Ratio
Calculates the urine sodium-to-potassium concentration ratio.
Open toolUrine Urea-to-Creatinine Ratio
Calculates the urine urea-to-creatinine concentration ratio.
Open toolUrine-to-Blood PCO₂ Gradient
Calculates the urine-to-blood PCO₂ gradient used during selected urinary acidification assessments.
Open toolRenal / General Medicine
3 toolsCockcroft Gault
Estimates creatinine clearance using the Cockcroft–Gault equation.
Open toolFractional Excretion of Sodium (FeNa)
Calculates fractional excretion of sodium from paired serum and urine sodium and creatinine measurements.
Open toolKDIGO Acute Kidney Injury Stage
Stages acute kidney injury using KDIGO serum creatinine and urine-output criteria.
Open toolRenal Medicine
19 toolsAKIN Classification
Stages AKI using AKIN creatinine and urine-output criteria.
Open toolBUN to Creatinine Ratio
Calculates the blood urea nitrogen to creatinine ratio.
Open toolCalcium–Phosphate Product
Calculates the serum calcium–phosphate product.
Open tooleGFR (CKD-EPI 2021) Calculator
Calculates estimated glomerular filtration rate using the 2021 CKD-EPI creatinine equation.
Open toolFractional Excretion of Phosphate
Calculates fractional excretion of phosphate from paired serum and urine phosphate and creatinine.
Open toolFractional Excretion of Urea
Calculates fractional excretion of urea from paired serum and urine measurements.
Open toolFractional Excretion of Uric Acid
Calculates fractional excretion of uric acid from paired serum and urine urate and creatinine.
Open toolFree Water Deficit
Estimates free water deficit in hypernatraemia from body weight, sodium and total body water fraction.
Open toolJelliffe Creatinine Clearance
Estimates adult creatinine clearance using the Jelliffe equation.
Open toolNormal Urine Output Reference
Provides concise urine-output thresholds used in adult and paediatric clinical assessment.
Open toolRIFLE AKI Classification
Classifies AKI using RIFLE creatinine/GFR and urine-output criteria.
Open toolSingle-Pool Kt/V
Calculates single-pool Kt/V for haemodialysis using the second-generation Daugirdas equation.
Open toolSodium Deficit
Estimates sodium deficit from total body water and current and target sodium.
Open toolTmP/GFR Calculator
Calculates the renal tubular maximum reabsorption of phosphate relative to GFR using the Bijvoet equation.
Open toolTranstubular Potassium Gradient
Calculates the transtubular potassium gradient.
Open toolTubular Reabsorption of Phosphate
Calculates tubular reabsorption of phosphate from paired serum and urine phosphate and creatinine.
Open toolUrea Reduction Ratio
Calculates haemodialysis urea reduction ratio from pre- and post-dialysis measurements.
Open toolUrine Anion Gap
Calculates the urine anion gap from urine sodium, potassium and chloride.
Open toolUrine Potassium–Creatinine Ratio
Calculates the spot urine potassium-to-creatinine ratio as an aid to assessing renal potassium loss.
Open toolRespiratory
16 toolsAirway Resistance
Calculates airway resistance from peak and plateau pressure and inspiratory flow.
Open toolAlveolar Gas Equation
Calculates estimated alveolar oxygen tension from inspired oxygen, atmospheric pressure, PaCO₂ and respiratory quotient.
Open toolArterial to End-Tidal CO₂ Gradient
Calculates the difference between arterial and end-tidal carbon dioxide.
Open toolBerlin Questionnaire for Sleep Apnoea Risk
Classifies obstructive sleep apnoea risk across snoring, daytime sleepiness and hypertension/BMI categories.
Open toolBova Score for Pulmonary Embolism
Predicts early PE-related complications in haemodynamically stable pulmonary embolism.
Open toolCOMPERA 2.0 Four-Strata PAH Risk
Classifies pulmonary arterial hypertension risk using WHO functional class, 6-minute walk distance and natriuretic peptide level.
Open toolDynamic Lung Compliance
Calculates dynamic respiratory-system compliance using peak inspiratory pressure.
Open toolMechanical Power of Ventilation
Estimates mechanical power delivered during volume-controlled ventilation using a simplified equation.
Open toolPhysiologic Dead Space by Bohr Equation
Calculates the physiologic dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolPulmonary Shunt Fraction
Calculates pulmonary shunt fraction from end-capillary, arterial and mixed venous oxygen content.
Open toolQuick COVID-19 Severity Index (qCSI)
Estimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Open toolRAPID Pleural Infection Score
Predicts mortality in pleural infection using renal function, age, purulence, infection source and albumin.
Open toolRapid Shallow Breathing Index
Calculates the rapid shallow breathing index from respiratory rate and spontaneous tidal volume.
Open toolREVEAL Lite 2 Risk Score
Provides an abridged pulmonary arterial hypertension risk estimate using six non-invasive variables.
Open toolSCAP Severe Community-Acquired Pneumonia Score
Identifies severe community-acquired pneumonia using major and minor clinical criteria.
Open toolStatic Lung Compliance
Calculates static respiratory-system compliance during mechanical ventilation.
Open toolRespiratory Medicine
24 tools4C Deterioration Score
Records and interprets a completed ISARIC 4C Deterioration Score.
Open tool4C Mortality Score
Estimates in-hospital mortality risk for adults admitted with COVID-19 using the ISARIC 4C Mortality Score.
Open toolAdult Arterial Blood Gas Reference
Provides commonly used adult arterial blood gas reference values.
Open toolAlveolar Oxygen Tension
Calculates alveolar oxygen tension using the alveolar gas equation.
Open toolAlveolar Ventilation Calculator
Calculates alveolar ventilation from tidal volume, dead-space volume and respiratory rate.
Open toolAlveolar-Arterial Oxygen Gradient
Calculates the alveolar-arterial oxygen gradient.
Open toolAlveolar–Arterial Oxygen Ratio
Calculates the arterial-to-alveolar oxygen ratio from PaO₂ and PAO₂.
Open toolArterial Oxygen Content Calculator
Calculates arterial oxygen content from haemoglobin, SaO₂ and PaO₂.
Open toolBAP-65 Score for Acute COPD Exacerbation
Risk-stratifies adults admitted with acute exacerbation of COPD using blood urea nitrogen, mental status, pulse and age.
Open toolBODE Index
Calculates the multidimensional BODE index for prognosis in stable COPD.
Open toolCOPD Assessment Test (CAT)
Calculates the eight-item COPD Assessment Test symptom-impact score.
Open toolCRB-65 Score
Assesses community-acquired pneumonia severity without requiring a blood urea result.
Open toolCURSI Score
Calculates CURSI pneumonia severity criteria.
Open toolDECAF Score
Records and interprets a completed DECAF score.
Open toolEnd-Tidal to Arterial CO₂ Ratio
Calculates the end-tidal to arterial carbon dioxide ratio.
Open toolEpworth Sleepiness Scale
Measures self-reported daytime sleepiness across eight common situations.
Open toolHACOR Score
Calculates the HACOR score after non-invasive ventilation in acute hypoxaemic respiratory failure.
Open toolNoSAS Score
Screens adults for risk of clinically significant sleep-disordered breathing using neck circumference, obesity, snoring, age and sex.
Open toolPhysiological Dead Space Fraction (Bohr)
Calculates physiological dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolPneumonia Severity Index (PSI/PORT)
Calculates the PSI/PORT score and risk class for adults with community-acquired pneumonia.
Open toolRespiratory Quotient
Calculates respiratory quotient from carbon dioxide production and oxygen consumption measured in the same units.
Open toolSMART-COP Score
Records and interprets a completed SMART-COP score.
Open toolSpO₂/FiO₂ Ratio
Calculates the peripheral oxygen saturation to inspired oxygen fraction ratio.
Open toolSTOP-BANG Questionnaire
Screens adults for risk of obstructive sleep apnoea using eight STOP-BANG items.
Open toolRheumatology
17 tools2010 ACR/EULAR Rheumatoid Arthritis Classification Criteria
Applies the 2010 classification score in patients with clinical synovitis not better explained by another disease.
Open tool2013 ACR/EULAR Systemic Sclerosis Classification Criteria
Applies the 2013 weighted systemic sclerosis classification criteria.
Open tool2015 ACR/EULAR Gout Classification Criteria
Applies the weighted 2015 gout classification score after the required entry criterion is met.
Open tool2016 Fibromyalgia Diagnostic Criteria
Assesses the 2016 fibromyalgia criteria using widespread pain, symptom severity and generalised pain.
Open tool2019 EULAR/ACR SLE Classification Criteria
Supports SLE classification after a positive ANA entry criterion, using the highest weighted item in each domain.
Open toolASDAS-CRP
Calculates axial spondyloarthritis disease activity using patient-reported domains and CRP.
Open toolASDAS-ESR
Calculates axial spondyloarthritis disease activity using patient-reported domains and ESR.
Open toolBath Ankylosing Spondylitis Disease Activity Index (BASDAI)
Calculates patient-reported disease activity in axial spondyloarthritis from six 0–10 questions.
Open toolBath Ankylosing Spondylitis Functional Index (BASFI)
Averages ten 0–10 functional questions used in axial spondyloarthritis.
Open toolCASPAR Criteria for Psoriatic Arthritis
Classifies psoriatic arthritis in a patient with inflammatory articular disease.
Open toolClinical Disease Activity Index (CDAI)
Calculates rheumatoid arthritis activity without a laboratory marker.
Open toolDAS28 CRP Disease Activity Score
Calculates rheumatoid arthritis disease activity from 28-joint counts, CRP and patient global health.
Open toolDAS28 ESR Disease Activity Score
Calculates rheumatoid arthritis disease activity from 28-joint counts, ESR and patient global health.
Open toolDisease Activity in Psoriatic Arthritis (DAPSA)
Calculates peripheral psoriatic arthritis activity using joint counts, patient assessments and CRP.
Open toolInternational Criteria for Behçet Disease (ICBD)
Applies the International Criteria for Behçet Disease weighted classification score.
Open toolSimplified Disease Activity Index (SDAI)
Calculates rheumatoid arthritis activity using joint counts, global assessments and CRP.
Open toolSLEDAI-2K
Calculates the SLE Disease Activity Index 2000 from weighted manifestations present during the assessment window.
Open toolSurgery
9 toolsAlvarado Score
Estimates the likelihood of acute appendicitis using symptoms, signs and laboratory findings.
Open toolApfel PONV Score
Calculates the simplified Apfel score for postoperative nausea and vomiting risk.
Open toolAppendicitis Inflammatory Response (AIR) Score
Estimates appendicitis probability using symptoms, examination findings and inflammatory markers.
Open toolARISCAT Postoperative Pulmonary Complication Score
Estimates risk of postoperative pulmonary complications from seven preoperative and procedural factors.
Open toolCaprini VTE Risk Score (2013)
Calculates the 2013 Caprini venous thromboembolism risk assessment score for surgical patients.
Open toolFournier's Gangrene Severity Index
Calculates the Fournier's Gangrene Severity Index from nine physiological and laboratory variables.
Open toolRevised Cardiac Risk Index (RCRI)
Estimates perioperative cardiac risk using the six Lee index predictors.
Open toolSurgical Apgar Score
Grades condition at the end of surgery using estimated blood loss, lowest mean arterial pressure and lowest heart rate.
Open toolSurgical Outcome Risk Tool (SORT)
Estimates 30-day mortality after inpatient non-cardiac surgery from six preoperative variables.
Open toolSurgery / Infectious Disease
1 toolsToxicology
1 toolsTransplant Medicine
2 toolsTrauma
11 toolsAssessment of Blood Consumption (ABC) Score
Calculates the four-item ABC score for early massive-transfusion risk.
Open toolCRAMS Trauma Scale
Provides rapid prehospital trauma triage using circulation, respiration, abdomen/thorax, motor and speech.
Open toolGAP Trauma Score
Calculates the Glasgow Coma Scale, Age and systolic blood Pressure trauma score.
Open toolKampala Trauma Score
Calculates the Kampala Trauma Score using age, systolic blood pressure, respiratory rate, neurological status and number of serious injuries.
Open toolMcLaughlin Massive Transfusion Score
Calculates a four-item early massive-transfusion prediction score using heart rate, systolic pressure, pH and haematocrit.
Open toolMGAP Trauma Score
Calculates the Mechanism, Glasgow Coma Scale, Age and arterial Pressure trauma score.
Open toolModified Brooke Burn Formula
Calculates a lower-volume initial 24-hour crystalloid estimate for adult burn resuscitation.
Open toolNew Injury Severity Score
Calculates NISS as the sum of squares of the three highest AIS injury scores, regardless of body region.
Open toolParkland Burn Resuscitation Formula
Calculates the initial 24-hour crystalloid estimate for major burns.
Open toolTrauma-Associated Severe Haemorrhage (TASH) Score
Calculates the TASH score to estimate risk of massive transfusion after severe trauma.
Open toolTRISS Survival Probability
Estimates survival probability from Revised Trauma Score, Injury Severity Score, age group and blunt or penetrating mechanism using original MTOS coefficients.
Open toolUrology
3 toolsA
78 toolsAbbreviated Burn Severity Index (ABSI)
Stratifies burn severity using age, sex, TBSA, inhalation injury and full-thickness burn.
Open toolABC/2 Intracerebral Haemorrhage Volume
Estimates intracerebral haemorrhage volume using the ABC/2 method.
Open toolABCD3-I Score for TIA
Estimates early stroke risk after transient ischaemic attack using clinical, dual-event and imaging features.
Open toolABCD² Score
Calculates the ABCD² score from age, initial blood pressure, clinical features, symptom duration and diabetes status.
Open toolAbsolute Eosinophil Count
Calculates absolute eosinophil count.
Open toolAbsolute Lymphocyte Count
Calculates the absolute lymphocyte count from total white blood cell count and lymphocyte percentage.
Open toolAbsolute Monocyte Count
Calculates the absolute monocyte count from total white blood cell count and monocyte percentage.
Open toolAbsolute Neutrophil Count
Calculates absolute neutrophil count.
Open toolACEF Cardiac Surgery Risk Score
Provides a simple cardiac surgery risk estimate from age, ejection fraction and renal function.
Open toolADHERE Acute Heart Failure Risk Tree
Stratifies in-hospital mortality risk in acute decompensated heart failure using admission BUN, systolic pressure and creatinine.
Open toolAdjusted Body Weight
Calculates adjusted body weight from actual and ideal body weight.
Open toolAdjusted Ideal Body Weight
Calculates adjusted body weight from actual and ideal body weight using a 0.4 correction factor.
Open toolAdrenaline Anaphylaxis Dose Calculator
Calculates a protocol-selected intramuscular adrenaline dose for anaphylaxis.
Open toolAdrogué–Madias Predicted Sodium Change
Estimates the change in serum sodium after one litre of an infusate using the Adrogué–Madias equation.
Open toolAdult Arterial Blood Gas Reference
Provides commonly used adult arterial blood gas reference values.
Open toolAdult Diabetic Ketoacidosis Severity Classification
Classifies adult diabetic ketoacidosis severity from arterial or venous pH, bicarbonate and mental status.
Open toolAdult ECG Rate and Interval Reference
Provides concise adult ECG rate and interval reference values.
Open toolAdult Glasgow Coma Scale Reference
Provides a concise adult Glasgow Coma Scale reference
Open toolAdult Pain Score Reference
Provides concise numeric, visual analogue and verbal pain-scale references.
Open toolAdult Routine Maintenance Chloride Requirement
Calculates the NICE adult routine maintenance chloride target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Potassium Requirement
Calculates the NICE adult routine maintenance potassium target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Sodium Requirement
Calculates the NICE adult routine maintenance sodium target of approximately 1 mmol/kg/day.
Open toolAdult Routine Maintenance Water Requirement
Calculates the NICE adult routine maintenance water range of 25–30 mL/kg/day.
Open toolAdult Ventilator Reference Values
Provides concise adult invasive ventilation reference concepts.
Open toolAdvanced Lung Cancer Inflammation Index
Calculates the advanced lung cancer inflammation index from BMI, albumin and neutrophil-to-lymphocyte ratio.
Open toolAge Shock Index
Calculates age multiplied by conventional shock index.
Open toolAge-Adjusted D-Dimer Threshold
Calculates the age-adjusted D-dimer threshold for patients aged over 50 years.
Open toolAge-Modified Shock Index
Calculates age multiplied by the modified shock index.
Open toolAggregate Index of Systemic Inflammation
Calculates the aggregate index of systemic inflammation from neutrophils, monocytes, platelets and lymphocytes.
Open toolAIMS65 Score
Estimates inpatient mortality risk in acute upper gastrointestinal bleeding using five variables.
Open toolAirway Resistance
Calculates airway resistance from peak and plateau pressure and inspiratory flow.
Open toolAKIN Classification
Stages AKI using AKIN creatinine and urine-output criteria.
Open toolALBI Score
Calculates the albumin-bilirubin score.
Open toolAlbumin Weak-Acid Charge
Estimates the negative charge contributed by albumin at a specified pH for Stewart acid–base analysis.
Open toolAlbumin-Corrected Anion Gap
Corrects the serum anion gap for albumin concentration.
Open toolAlbumin-Corrected Fructosamine
Calculates an albumin-corrected fructosamine value.
Open toolAlbumin-Normalised Valproate Concentration
Estimates a normalised total valproate concentration using the Hermida–Tutor albumin-based free-fraction model.
Open toolAlbumin/Globulin Ratio Calculator
Calculates the albumin-to-globulin ratio from albumin and total protein.
Open toolAlbumin–Bilirubin (ALBI) Score
Calculates the ALBI score from serum albumin and bilirubin.
Open toolALT-70 Cellulitis Score
Supports differentiation of lower-extremity cellulitis from pseudocellulitis.
Open toolaltered_mentation
Provides the altered_mentation clinical calculation or assessment.
Open toolAlvarado Score
Estimates the likelihood of acute appendicitis using symptoms, signs and laboratory findings.
Open toolAlveolar Gas Equation
Calculates estimated alveolar oxygen tension from inspired oxygen, atmospheric pressure, PaCO₂ and respiratory quotient.
Open toolAlveolar Oxygen Tension
Calculates alveolar oxygen tension using the alveolar gas equation.
Open toolAlveolar Ventilation Calculator
Calculates alveolar ventilation from tidal volume, dead-space volume and respiratory rate.
Open toolAlveolar-Arterial Oxygen Gradient
Calculates the alveolar-arterial oxygen gradient.
Open toolAlveolar–Arterial Oxygen Ratio
Calculates the arterial-to-alveolar oxygen ratio from PaO₂ and PAO₂.
Open toolAmikacin Extended-Interval Concentration Projection
Projects a measured Amikacin concentration to a future time using an individual elimination rate constant.
Open toolAmikacin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Amikacin concentration to a selected peak reference time.
Open toolAmikacin Projected Trough Concentration
Projects a post-distribution Amikacin concentration forward to the end of the dosing interval.
Open toolAmikacin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Amikacin from two post-distribution serum concentrations and their sampling times.
Open toolAmikacin Two-Level Half-Life
Calculates the apparent elimination half-life of Amikacin from two post-distribution concentrations.
Open toolAminoglycoside Dosing Weight
Calculates an adjusted dosing weight for aminoglycosides in patients whose actual weight exceeds ideal weight.
Open toolAmniotic Fluid Index
Sums the deepest vertical fluid pocket in each of four uterine quadrants.
Open toolAmoxicillin Paediatric Dose Calculator
Calculates a clinician-selected weight-based paediatric amoxicillin dose.
Open toolAnion Gap
Calculates the serum anion gap with or without potassium.
Open toolAortic Valve Area Calculator
Calculates aortic valve area using the continuity equation.
Open toolAPACHE II Score
Calculates APACHE II illness-severity points from acute physiology, age and chronic health status.
Open toolAPACHE III Score
Records and interprets a completed APACHE III score.
Open toolApfel PONV Score
Calculates the simplified Apfel score for postoperative nausea and vomiting risk.
Open toolApgar Score
Calculates the Apgar score from appearance, pulse, grimace, activity and respiration.
Open toolApparent Strong Ion Difference
Calculates the apparent strong ion difference using major measured strong ions and lactate.
Open toolApparent Volume of Distribution
Calculates an apparent volume of distribution from the amount of drug in the body and plasma concentration.
Open toolAppendicitis Inflammatory Response (AIR) Score
Estimates appendicitis probability using symptoms, examination findings and inflammatory markers.
Open toolARISCAT Postoperative Pulmonary Complication Score
Estimates risk of postoperative pulmonary complications from seven preoperative and procedural factors.
Open toolArterial Oxygen Content (Expanded Equation)
Calculates arterial oxygen content from haemoglobin, arterial saturation and dissolved oxygen.
Open toolArterial Oxygen Content Calculator
Calculates arterial oxygen content from haemoglobin, SaO₂ and PaO₂.
Open toolArterial to End-Tidal CO₂ Gradient
Calculates the difference between arterial and end-tidal carbon dioxide.
Open toolArteriovenous Oxygen Content Difference
Calculates the arterial–venous oxygen content difference.
Open toolASDAS-CRP
Calculates axial spondyloarthritis disease activity using patient-reported domains and CRP.
Open toolASDAS-ESR
Calculates axial spondyloarthritis disease activity using patient-reported domains and ESR.
Open toolAssessment of Blood Consumption (ABC) Score
Calculates the four-item ABC score for early massive-transfusion risk.
Open toolAST to ALT Ratio
Calculates the aspartate aminotransferase to alanine aminotransferase ratio.
Open toolAST to Platelet Ratio Index
Calculates APRI from AST, the laboratory AST upper limit and platelet count.
Open toolAST/ALT (De Ritis) Ratio
Calculates the ratio of aspartate aminotransferase to alanine aminotransferase.
Open toolAtherogenic Index of Plasma
Calculates the base-10 logarithm of the triglyceride-to-HDL cholesterol ratio using molar concentrations.
Open toolATRIA Bleeding Score
Estimates haemorrhage risk in adults with atrial fibrillation receiving anticoagulation.
Open toolAUDIT-C Alcohol Screen
Three-item alcohol use screening score.
Open toolB
26 toolsBacterial Meningitis Score
Identifies children with CSF pleocytosis at very low risk of bacterial meningitis when strict eligibility criteria are met.
Open toolBalance of Risk (BAR) Score
Estimates early mortality after liver transplantation from recipient, donor and procedural variables.
Open toolBAP-65 Score for Acute COPD Exacerbation
Risk-stratifies adults admitted with acute exacerbation of COPD using blood urea nitrogen, mental status, pulse and age.
Open toolBARD Score
Calculates the BARD score for advanced fibrosis risk in NAFLD.
Open toolBarthel Index
Measures performance in ten activities of daily living.
Open toolBase Excess by Van Slyke Equation
Calculates an approximate standard base excess from pH and bicarbonate.
Open toolBath Ankylosing Spondylitis Disease Activity Index (BASDAI)
Calculates patient-reported disease activity in axial spondyloarthritis from six 0–10 questions.
Open toolBath Ankylosing Spondylitis Functional Index (BASFI)
Averages ten 0–10 functional questions used in axial spondyloarthritis.
Open toolBaveno VI Variceal Screening Criteria
Identifies compensated advanced chronic liver disease patients who may avoid screening endoscopy using liver stiffness and platelet count.
Open toolBedside Schwartz eGFR
Estimates paediatric eGFR using the bedside Schwartz equation.
Open toolBehavioural Pain Scale
Assesses pain-related behaviour in mechanically ventilated adults.
Open toolBelgian Outcome in Burn Injury (BOBI) Score
Stratifies mortality risk after burn injury using age, TBSA and inhalation injury.
Open toolBerlin Questionnaire for Sleep Apnoea Risk
Classifies obstructive sleep apnoea risk across snoring, daytime sleepiness and hypertension/BMI categories.
Open toolBicarbonate Deficit
Estimates bicarbonate deficit.
Open toolBISAP Score
Calculates the Bedside Index for Severity in Acute Pancreatitis during the first 24 hours.
Open toolBishop Score
Calculates the Bishop cervical score before induction of labour.
Open toolBODE Index
Calculates the multidimensional BODE index for prognosis in stable COPD.
Open toolBody Fat Percentage Calculator
Estimates adult body fat percentage from BMI, age and sex using the Deurenberg equation.
Open toolBody Mass Index (BMI)
Calculates adult body mass index from height and weight and provides the corresponding adult BMI category.
Open toolBody Surface Area
Calculates body surface area using the Mosteller formula.
Open toolBoston Syncope Criteria
Identifies high-risk features in adults presenting with syncope.
Open toolBova Score for Pulmonary Embolism
Predicts early PE-related complications in haemodynamically stable pulmonary embolism.
Open toolBraden Scale
Assesses adult pressure injury risk across six Braden subscales.
Open toolBristol Stool Form Scale
Classifies stool form from type 1 to type 7 using the Bristol Stool Form Scale.
Open toolBUN to Creatinine Ratio
Calculates the blood urea nitrogen to creatinine ratio.
Open toolBurch-Wartofsky Point Scale
Calculates the Burch-Wartofsky Point Scale for suspected thyroid storm.
Open toolC
81 toolsC-Peptide to Glucose Ratio
Calculates a fasting or stimulated C-peptide-to-glucose ratio as a marker of endogenous insulin secretion.
Open toolC-Reactive Protein to Albumin Ratio
Calculates the C-reactive protein to albumin ratio using matched laboratory units.
Open toolCADILLAC Risk Score
Estimates 1-year mortality after primary PCI for acute myocardial infarction.
Open toolCAGE Alcohol Screen
Four-question screen for problematic alcohol use.
Open toolCalcium–Creatinine Clearance Ratio
Calculates the calcium–creatinine clearance ratio used in hypercalcaemia assessment.
Open toolCalcium–Phosphate Product
Calculates the serum calcium–phosphate product.
Open toolCalculated Base Deficit
Calculates base deficit as the negative of base excess.
Open toolCalculated Bicarbonate
Calculates bicarbonate from pH and PaCO₂ using the Henderson–Hasselbalch relationship.
Open toolCalculated Bicarbonate from pH and PaCO₂
Calculates bicarbonate from pH and arterial carbon dioxide tension using Henderson–Hasselbalch.
Open toolCalculated PaCO₂ from pH and Bicarbonate
Calculates arterial carbon dioxide tension from pH and bicarbonate using Henderson–Hasselbalch.
Open toolCalculated Serum Osmolality
Calculates estimated serum osmolality from sodium, glucose and blood urea nitrogen.
Open toolCalculated Serum Osmolality (SI Units)
Calculates estimated serum osmolality from sodium, glucose and urea in SI units.
Open toolCalculated Urine Osmolality
Estimates urine osmolality from urine sodium, potassium and urea.
Open toolCanadian C-Spine Rule
Applies the Canadian C-Spine Rule to support cervical spine imaging decisions in alert, stable trauma patients.
Open toolCanadian CT Head Rule
Applies the Canadian CT Head Rule high- and medium-risk criteria in eligible adults with minor head injury.
Open toolCanadian Syncope Risk Score
Predicts 30-day serious outcomes after emergency department assessment of syncope.
Open toolCaprini VTE Risk Score (2013)
Calculates the 2013 Caprini venous thromboembolism risk assessment score for surgical patients.
Open toolCarboplatin Dose by Calvert Formula
Calculates carboplatin dose from target AUC and measured or estimated GFR.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Output by Fick Principle
Calculates cardiac output from oxygen consumption and the arterial–venous oxygen content difference.
Open toolCardiac Power Index
Calculates cardiac power indexed to body surface area from mean arterial pressure and cardiac index.
Open toolCardiac Power Index
Calculates cardiac power index from mean arterial pressure and cardiac index.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
Open toolCardShock Risk Score
Estimates short-term mortality in cardiogenic shock using seven bedside variables.
Open toolCARG Chemotherapy Toxicity Score
Estimates grade 3–5 chemotherapy toxicity risk in adults aged 65 years or older.
Open toolCASPAR Criteria for Psoriatic Arthritis
Classifies psoriatic arthritis in a patient with inflammatory articular disease.
Open toolCastelli Risk Index I
Calculates the total cholesterol-to-HDL cholesterol ratio.
Open toolCastelli Risk Index II
Calculates the LDL cholesterol-to-HDL cholesterol ratio.
Open toolCATCH Paediatric Head Injury Rule
Identifies children with minor head injury who may require CT according to the CATCH rule.
Open toolCelsius ↔ Fahrenheit Converter
Converts temperature between Celsius and Fahrenheit
Open toolCentor / McIsaac Score
Estimates the likelihood of group A streptococcal pharyngitis using modified Centor criteria.
Open toolCentral Nervous System International Prognostic Index (CNS-IPI)
Calculates CNS-IPI for diffuse large B-cell lymphoma using the five IPI factors plus kidney or adrenal involvement.
Open toolCerebral Perfusion Pressure
Calculates cerebral perfusion pressure from mean arterial pressure and intracranial pressure.
Open toolCerebroplacental Ratio
Calculates the fetal middle cerebral artery to umbilical artery pulsatility-index ratio.
Open toolCHALICE Head Injury Rule
Screens children after head injury for CHALICE criteria associated with clinically significant intracranial injury.
Open toolCharlson Comorbidity Index
Calculates the Charlson Comorbidity Index with age adjustment.
Open toolCHA₂DS₂-VA Score
Estimates thromboembolic risk factors in atrial fibrillation without assigning a point for sex.
Open toolChild-Pugh Score
Classifies cirrhosis severity using bilirubin, albumin, INR, ascites and hepatic encephalopathy.
Open toolChloride Corrected for Sodium
Normalises measured chloride to a reference sodium concentration to assess relative hyperchloraemia or hypochloraemia.
Open toolChloride-to-Sodium Ratio
Calculates the serum chloride-to-sodium ratio as a simplified acid–base screening measure.
Open toolCISNE Score
Calculates the Clinical Index of Stable Febrile Neutropenia in selected adults with solid tumours.
Open toolCIWA-Ar Alcohol Withdrawal Scale
Quantifies alcohol withdrawal severity to support monitored treatment.
Open toolCKD-EPI Creatinine–Cystatin C Equation 2021
Calculates race-free eGFR using the 2021 CKD-EPI combined creatinine and cystatin C equation.
Open toolCKD-EPI Cystatin C Equation 2012
Calculates eGFR using the 2012 CKD-EPI cystatin C equation.
Open toolCKiD U25 Combined eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCKiD U25 Creatinine eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCKiD U25 Cystatin C eGFR
Estimates GFR in children and young adults using the CKiD U25 equation.
Open toolCLIF-C ACLF Score
Estimates mortality in acute-on-chronic liver failure using CLIF organ-failure score, age and white-cell count.
Open toolCLIF-C Acute Decompensation Score
Estimates mortality in acutely decompensated cirrhosis without ACLF.
Open toolClinical Disease Activity Index (CDAI)
Calculates rheumatoid arthritis activity without a laboratory marker.
Open toolClinical Frailty Scale
Classifies baseline fitness and frailty from 1 to 9 using the Clinical Frailty Scale.
Open toolClinical Opiate Withdrawal Scale
Rates common signs and symptoms of opioid withdrawal.
Open toolCLL International Prognostic Index (CLL-IPI)
Calculates CLL-IPI using TP53 status, IGHV mutation status, beta-2 microglobulin, clinical stage and age.
Open toolcm ↔ ft/in Converter
Converts height between centimetres and feet/inches.
Open toolCNS-IPI for Diffuse Large B-Cell Lymphoma
Estimates risk of central nervous system relapse in diffuse large B-cell lymphoma.
Open toolCockcroft Gault
Estimates creatinine clearance using the Cockcroft–Gault equation.
Open toolCommon Electrolyte Reference Values
Provides illustrative adult reference intervals for common electrolytes.
Open toolCOMPERA 2.0 Four-Strata PAH Risk
Classifies pulmonary arterial hypertension risk using WHO functional class, 6-minute walk distance and natriuretic peptide level.
Open toolconfusion
Clinical calculator for CURB65Score.
Open toolConfusion Assessment Method (CAM)
Applies the four-feature Confusion Assessment Method algorithm for delirium screening.
Open toolContinuous Infusion Rate for Target Steady-State Concentration
Calculates a continuous infusion rate from total drug clearance and a target steady-state concentration.
Open toolControlling Nutritional Status (CONUT) Score
Screens nutritional status using albumin, total lymphocyte count and total cholesterol.
Open toolCOPD Assessment Test (CAT)
Calculates the eight-item COPD Assessment Test symptom-impact score.
Open toolCornell Voltage Criterion
Calculates the Cornell ECG voltage criterion for left ventricular hypertrophy.
Open toolCorrected Calcium
Corrects serum calcium for albumin concentration.
Open toolCorrected Gestational Age
Calculates corrected age for a child born preterm from chronological age and gestational age at birth.
Open toolCorrected Minute Ventilation
Calculates corrected minute ventilation using measured minute ventilation and PaCO₂.
Open toolCorrected Phenytoin by Sheiner–Tozer Equation
Estimates an albumin-adjusted total phenytoin concentration, with an optional coefficient for severe renal impairment.
Open toolCorrected QT (QTc) Calculator
Calculates corrected QT using Bazett, Fridericia, Framingham and Hodges formulae.
Open toolCorrected Reticulocyte Count
Calculates corrected reticulocyte percentage from patient and reference haematocrit.
Open toolCorrected Sodium for Hyperglycaemia
Estimates corrected serum sodium in hyperglycaemia.
Open toolCorrected Sodium for Hyperglycaemia (Hillier)
Calculates serum sodium corrected for hyperglycaemia using the Hillier correction factor.
Open toolCorrected White Cell Count for Nucleated Red Blood Cells
Corrects an automated white blood cell count when nucleated red blood cells are included in the reported count.
Open toolCRAMS Trauma Scale
Provides rapid prehospital trauma triage using circulation, respiration, abdomen/thorax, motor and speech.
Open toolCRB-65 Score
Assesses community-acquired pneumonia severity without requiring a blood urea result.
Open toolCreatinine Clearance (Salazar–Corcoran)
Estimates creatinine clearance in patients with obesity using the Salazar–Corcoran equation.
Open toolCRIB II Score
Estimates early mortality risk in very preterm or very-low-birth-weight infants using birth and admission variables.
Open toolCritical-Care Pain Observation Tool
Observational pain assessment for critically ill adults unable to self-report.
Open toolCURSI Score
Calculates CURSI pneumonia severity criteria.
Open toolD
28 toolsDAPT Score
Estimates the balance of ischaemic benefit and bleeding harm from extending dual antiplatelet therapy beyond 12 months after PCI.
Open toolDAS28 CRP Disease Activity Score
Calculates rheumatoid arthritis disease activity from 28-joint counts, CRP and patient global health.
Open toolDAS28 ESR Disease Activity Score
Calculates rheumatoid arthritis disease activity from 28-joint counts, ESR and patient global health.
Open toolDASH Score for VTE Recurrence
Estimates recurrence risk after a first unprovoked venous thromboembolism.
Open toolDe Ritis Ratio
Calculates the AST to ALT ratio.
Open toolDead Space Fraction (Enghoff Modification)
Calculates the Enghoff modification of dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolDeauville Five-Point Scale
Classifies FDG PET uptake relative to mediastinal blood pool and liver in lymphoma response assessment.
Open toolDECAF Score
Records and interprets a completed DECAF score.
Open toolDelta Gap
Calculates the increase in anion gap above a reference value of 12 mmol/L.
Open toolDelta Ratio
Calculates the delta ratio to support assessment of mixed metabolic acid–base disorders.
Open toolDerived Neutrophil-to-Lymphocyte Ratio
Calculates the derived neutrophil-to-lymphocyte ratio from total white-cell and neutrophil counts.
Open toolDiastolic Pulmonary Gradient
Calculates the diastolic pulmonary gradient from diastolic pulmonary artery and wedge pressures.
Open toolDiastolic Shock Index
Calculates heart rate divided by diastolic blood pressure as an adjunctive marker of vasodilatory shock.
Open toolDIPSS-Plus for Primary Myelofibrosis
Calculates DIPSS-Plus from DIPSS category, karyotype, platelet count and red-cell transfusion dependence.
Open toolDisease Activity in Psoriatic Arthritis (DAPSA)
Calculates peripheral psoriatic arthritis activity using joint counts, patient assessments and CRP.
Open toolDonor-MELD (D-MELD)
Calculates donor age multiplied by recipient MELD as a simple liver-transplant outcome index.
Open toolDownes Respiratory Distress Score
Grades neonatal respiratory distress using respiratory rate, cyanosis, air entry, grunting and retractions.
Open toolDRAGON Score for Stroke Outcome
Predicts poor functional outcome after intravenous thrombolysis for acute ischaemic stroke.
Open toolDriving Pressure Calculator
Calculates respiratory-system driving pressure from plateau pressure and total PEEP.
Open toolDrug Clearance from Dose and AUC
Calculates apparent systemic clearance from dose, bioavailability and area under the concentration–time curve.
Open toolDrug Half-Life from Elimination Rate Constant
Calculates first-order elimination half-life from the elimination rate constant.
Open toolDrug Half-Life from Two Concentrations
Calculates first-order elimination half-life from two post-distribution concentrations and sample times.
Open toolDrug Loading Dose
Calculates a theoretical loading dose from target concentration, apparent volume of distribution and bioavailability.
Open toolDrug Maintenance Dose Rate
Calculates a theoretical maintenance dose rate from target steady-state concentration, clearance and bioavailability.
Open toolDua Ocular Burn Classification
Grades ocular surface burns from limbal and conjunctival involvement.
Open toolDuke Treadmill Score
Calculates the Duke Treadmill Score from exercise time, ST deviation and exercise angina.
Open toolDynamic International Prognostic Scoring System (DIPSS)
Calculates DIPSS risk for primary myelofibrosis at any point during the disease course.
Open toolDynamic Lung Compliance
Calculates dynamic respiratory-system compliance using peak inspiratory pressure.
Open toolE
35 toolsECG QTc Normal Ranges
Provides commonly used adult QTc interpretation thresholds
Open toolECOG Performance Status
Classifies functional status from grade 0 to 5 using the ECOG performance scale.
Open toolEczema Area and Severity Index
Quantifies the extent and clinical severity of atopic dermatitis.
Open toolEdinburgh Postnatal Depression Scale
Ten-item screening questionnaire for depressive symptoms during pregnancy and after birth.
Open toolEdmonton Symptom Assessment System Revised
Rates nine common symptoms in palliative and oncology care on 0–10 scales.
Open toolEffective Serum Osmolality
Calculates effective serum osmolality, or tonicity, from serum sodium and glucose while excluding urea.
Open toolEffective Strong Ion Difference
Calculates effective strong ion difference from bicarbonate plus albumin and phosphate weak-acid charges.
Open tooleGFR (CKD-EPI 2021) Calculator
Calculates estimated glomerular filtration rate using the 2021 CKD-EPI creatinine equation.
Open toolEGSYS Score for Syncope
Estimates the likelihood of a cardiac cause of syncope.
Open toolEjection Fraction from Ventricular Volumes
Calculates ventricular ejection fraction from end-diastolic and end-systolic volumes.
Open toolElectrolyte Infusion Delivery Rate
Calculates hourly electrolyte delivery from concentration and fluid infusion rate.
Open toolElectrolyte-Free Water Clearance
Calculates electrolyte-free water clearance from urine flow and urine and plasma electrolytes.
Open toolElimination Rate Constant from Half-Life
Calculates the first-order elimination rate constant from a drug half-life.
Open toolEnd-Tidal to Arterial CO₂ Ratio
Calculates the end-tidal to arterial carbon dioxide ratio.
Open toolEngland and Fraser Index
Calculates the England and Fraser red-cell discrimination index.
Open toolEnoxaparin Dose Calculator
Calculates a clinician-selected weight-based enoxaparin dose.
Open toolEpworth Sleepiness Scale
Measures self-reported daytime sleepiness across eight common situations.
Open toolEquilibrated Kt/V
Estimates equilibrated Kt/V from single-pool Kt/V and dialysis duration.
Open toolEssen Stroke Risk Score
Estimates recurrent vascular event risk after ischaemic stroke or transient ischaemic attack.
Open toolEstimated Average Glucose from HbA1c
Estimates average glucose from glycated haemoglobin.
Open toolEstimated Blood Volume (Nadler)
Estimates adult blood volume using sex, height and weight.
Open toolEstimated Due Date
Estimates the expected date of delivery from the first day of the last menstrual period.
Open toolEstimated Due Date by Nägele Rule
Estimates the number of days from the first day of the last menstrual period to the due date.
Open toolEstimated Mean Pulmonary Artery Pressure (Chemla)
Estimates mean pulmonary artery pressure from systolic pulmonary artery pressure using the Chemla equation.
Open toolEstimated Paediatric Blood Volume
Estimates paediatric blood volume from body weight and an age-category coefficient.
Open toolEstimated Urine Osmolality
Estimates urine osmolality from urine sodium, potassium, urea and glucose.
Open toolEUTOS Long-Term Survival (ELTS) Score
Calculates the ELTS score for chronic myeloid leukaemia from age, spleen size, peripheral-blood blasts and platelet count.
Open toolEUTOS Score for Chronic Myeloid Leukaemia
Calculates EUTOS risk from spleen size and basophil percentage.
Open toolExpected Bicarbonate in Acute Respiratory Acidosis
Calculates expected bicarbonate for acute respiratory acidosis.
Open toolExpected Bicarbonate in Acute Respiratory Alkalosis
Calculates expected bicarbonate for acute respiratory alkalosis.
Open toolExpected Bicarbonate in Chronic Respiratory Acidosis
Calculates expected bicarbonate for chronic respiratory acidosis.
Open toolExpected Bicarbonate in Chronic Respiratory Alkalosis
Calculates expected bicarbonate for chronic respiratory alkalosis.
Open toolExpected PaCO₂ in Metabolic Acidosis
Calculates expected respiratory compensation in metabolic acidosis using Winter's formula.
Open toolExpected PaCO₂ in Metabolic Alkalosis
Calculates the expected PaCO₂ range for respiratory compensation in metabolic alkalosis.
Open toolExtrapolated Post-Distribution Peak Concentration
Back-extrapolates a measured post-distribution concentration to an earlier target time using a first-order elimination rate constant.
Open toolF
28 toolsFactor IX Dose Estimator
Estimates factor IX units required to achieve a target rise.
Open toolFactor VIII Dose Estimator
Estimates factor VIII units required to achieve a target rise.
Open toolFagerström Test for Nicotine Dependence
Estimates the intensity of physical nicotine dependence.
Open toolFIB-4 Index
Calculates the FIB-4 index from age, AST, ALT and platelet count.
Open toolFIB-4 Index
Calculates FIB-4 from age, AST, ALT and platelet count.
Open toolFlucloxacillin Dose Calculator
Calculates a clinician-selected flucloxacillin dose calculator dose.
Open toolFollicular Lymphoma International Prognostic Index (FLIPI)
Calculates FLIPI risk from age, stage, haemoglobin, LDH and involved nodal areas.
Open toolFollicular Lymphoma International Prognostic Index 2 (FLIPI2)
Calculates FLIPI2 from age, beta-2 microglobulin, haemoglobin, largest lymph-node diameter and bone-marrow involvement.
Open toolForns Fibrosis Score
Calculates the Forns index from age, platelet count, GGT and cholesterol.
Open toolFOUR Score
Assesses consciousness using eye response, motor response, brainstem reflexes and respiration.
Open toolFournier's Gangrene Severity Index
Calculates the Fournier's Gangrene Severity Index from nine physiological and laboratory variables.
Open toolFractional Excretion of Bicarbonate
Calculates fractional bicarbonate excretion from paired urine and serum bicarbonate and creatinine measurements.
Open toolFractional Excretion of Chloride
Calculates fractional excretion of chloride from paired urine and serum measurements.
Open toolFractional Excretion of Magnesium
Calculates fractional magnesium excretion using paired serum and urine magnesium and creatinine values.
Open toolFractional Excretion of Phosphate
Calculates fractional excretion of phosphate from paired serum and urine phosphate and creatinine.
Open toolFractional Excretion of Potassium
Calculates the percentage of filtered potassium excreted in urine from paired serum and urine potassium and creatinine values.
Open toolFractional Excretion of Sodium (FeNa)
Calculates fractional excretion of sodium from paired serum and urine sodium and creatinine measurements.
Open toolFractional Excretion of Urea
Calculates fractional excretion of urea from paired serum and urine measurements.
Open toolFractional Excretion of Uric Acid
Calculates fractional excretion of uric acid from paired serum and urine urate and creatinine.
Open toolFree Androgen Index
Calculates the free androgen index from total testosterone and sex hormone-binding globulin.
Open toolFree Water Clearance
Calculates free water clearance from urine flow and osmolal clearance.
Open toolFree Water Deficit
Estimates free water deficit in hypernatraemia from body weight, sodium and total body water fraction.
Open toolFriedewald LDL Cholesterol
Estimates LDL cholesterol from total cholesterol, HDL cholesterol and triglycerides using the Friedewald equation.
Open toolFull Age Spectrum Creatinine eGFR
Estimates eGFR using the Full Age Spectrum creatinine equation.
Open toolFull Age Spectrum Cystatin C eGFR
Estimates eGFR using the Full Age Spectrum cystatin C equation.
Open toolFull Rockall Score
Calculates the full Rockall score for upper gastrointestinal bleeding using clinical and endoscopic findings.
Open toolFUNC Score for Functional Outcome After ICH
Predicts likelihood of functional independence after spontaneous intracerebral haemorrhage.
Open toolFurosemide Stress Test
Interprets 2-hour urine output after a standardised furosemide challenge in early AKI.
Open toolG
20 toolsG8 Geriatric Oncology Screening Tool
Screens older adults with cancer for vulnerability warranting comprehensive geriatric assessment.
Open toolGAD-7 Anxiety Severity
Assesses generalised anxiety symptom severity over the preceding two weeks.
Open toolGAP Trauma Score
Calculates the Glasgow Coma Scale, Age and systolic blood Pressure trauma score.
Open toolGentamicin Dose Calculator
Calculates a protocol-selected weight-based gentamicin dose.
Open toolGentamicin Extended-Interval Concentration Projection
Projects a measured Gentamicin concentration to a future time using an individual elimination rate constant.
Open toolGentamicin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Gentamicin concentration to a selected peak reference time.
Open toolGentamicin Projected Trough Concentration
Projects a post-distribution Gentamicin concentration forward to the end of the dosing interval.
Open toolGentamicin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Gentamicin from two post-distribution serum concentrations and their sampling times.
Open toolGentamicin Two-Level Half-Life
Calculates the apparent elimination half-life of Gentamicin from two post-distribution concentrations.
Open toolGeriatric Nutritional Risk Index
Calculates the geriatric nutritional risk index from serum albumin, body weight and ideal body weight.
Open toolGestational Age from Crown–Rump Length
Estimates gestational age from first-trimester crown–rump length using the Robinson–Fleming relationship.
Open toolGestational Age from LMP Interval
Converts elapsed days since the last menstrual period into completed weeks and remaining days.
Open toolGlasgow Alcoholic Hepatitis Score
Records and interprets a completed Glasgow Alcoholic Hepatitis Score.
Open toolGlasgow Coma Scale
Assess level of consciousness from the best eye, verbal and motor responses.
Open toolGlasgow Prognostic Score (GPS)
Calculates the original Glasgow Prognostic Score from CRP and albumin.
Open toolGlasgow-Blatchford Bleeding Score
Risk-stratifies upper gastrointestinal bleeding before endoscopy using clinical and laboratory variables.
Open toolGlasgow-Imrie Score
Calculates the Glasgow-Imrie severity score for acute pancreatitis.
Open toolGlobal Antiphospholipid Syndrome Score (GAPSS)
Estimates thrombotic and pregnancy morbidity risk in antiphospholipid syndrome.
Open toolGlucose to Lymphocyte Ratio
Calculates blood glucose divided by absolute lymphocyte count.
Open toolGRACE ACS Risk Score
Calculates a bedside GRACE acute coronary syndrome risk score using the established point-based variables.
Open toolH
25 toolsHACOR Score
Calculates the HACOR score after non-invasive ventilation in acute hypoxaemic respiratory failure.
Open toolHadlock Four-Parameter Estimated Fetal Weight
Estimates fetal weight from biparietal diameter, head circumference, abdominal circumference and femur length using the Hadlock four-parameter equation.
Open toolHALP Score
Calculates the haemoglobin, albumin, lymphocyte and platelet (HALP) score.
Open toolHAS-BLED Score
Estimates major bleeding risk in patients with atrial fibrillation using the HAS-BLED clinical risk factors.
Open toolHAT Score for Haemorrhage After Thrombolysis
Estimates haemorrhage risk after intravenous thrombolysis for acute ischaemic stroke.
Open toolHEAR Score
Risk-stratifies selected adults with acute chest pain using history, ECG, age and cardiovascular risk factors without troponin.
Open toolHEART Score
Risk-stratifies adults with suspected acute coronary syndrome using history, ECG, age, risk factors and troponin.
Open toolHematopoietic Cell Transplantation Comorbidity Index (HCT-CI)
Calculates the HCT-CI from pre-transplant comorbidities to support allogeneic transplant risk assessment.
Open toolHenderson–Hasselbalch pH
Calculates pH from bicarbonate and arterial carbon dioxide tension.
Open toolHendrich II Fall Risk Model
Estimates inpatient fall risk using eight weighted factors.
Open toolHepatic Steatosis Index
Calculates the hepatic steatosis index from ALT/AST ratio, BMI, sex and diabetes status.
Open toolHERDOO2 Rule
Identifies women with first unprovoked VTE who may be at low recurrence risk after treatment.
Open toolHestia Criteria
Identifies exclusion criteria for outpatient treatment of confirmed acute pulmonary embolism.
Open toolHFA–PEFF Diagnostic Score
Supports assessment of heart failure with preserved ejection fraction using functional, morphological and biomarker domains.
Open toolHIAT2 Score for Poor Outcome After Endovascular Therapy
Predicts poor outcome after intra-arterial/endovascular therapy for acute ischaemic stroke.
Open toolHLH-2004 Diagnostic Criteria
Counts the eight HLH-2004 clinical and laboratory diagnostic criteria.
Open toolHolliday-Segar Daily Maintenance Fluids
Calculates traditional daily paediatric maintenance fluid volume.
Open toolHolliday–Segar Daily Maintenance Fluid
Calculates estimated daily maintenance fluid using the Holliday–Segar 100/50/20 rule.
Open toolHOMA-Beta Cell Function
Estimates pancreatic beta-cell function from fasting glucose and insulin using the original HOMA equation.
Open toolHOMA-IR Calculator
Calculates HOMA-IR from fasting glucose and fasting insulin.
Open toolHScore for Reactive Haemophagocytic Syndrome
Estimates the probability of reactive haemophagocytic syndrome from nine weighted clinical, laboratory and marrow variables.
Open toolHunt & Hess Scale
Grades clinical severity after aneurysmal subarachnoid haemorrhage.
Open toolHunt and Hess Subarachnoid Haemorrhage Grade
Grades clinical severity of aneurysmal subarachnoid haemorrhage.
Open toolHunter Serotonin Toxicity Criteria
Applies the Hunter decision rules in a patient exposed to a serotonergic agent.
Open toolH₂FPEF Score
Calculates the H₂FPEF score for unexplained dyspnoea and suspected HFpEF.
Open toolI
25 toolsIABP-SHOCK II Risk Score
Estimates 30-day mortality after PCI for myocardial infarction complicated by cardiogenic shock.
Open toolIbuprofen Paediatric Dose Calculator
Calculates a clinician-selected weight-based paediatric ibuprofen dose.
Open toolICH Score
Estimates mortality risk after spontaneous intracerebral haemorrhage using five admission variables.
Open toolIdeal Body Weight
Calculates ideal body weight using the Devine formula.
Open toolIdeal Body Weight (Devine, Metric)
Calculates Devine ideal body weight from sex and height.
Open toolIMDC Metastatic Renal Cell Carcinoma Score
Calculates the IMDC risk group for metastatic renal cell carcinoma from six adverse prognostic factors.
Open toolIMPROVE Bleeding Risk Score
Estimates in-hospital bleeding risk in acutely ill medical patients considered for thromboprophylaxis.
Open toolIMPROVE VTE Risk Score
Estimates venous thromboembolism risk in acutely ill hospitalised medical patients.
Open toolInfusate Chloride Load
Calculates chloride delivered by an intravenous fluid from concentration and volume.
Open toolInfusate Potassium Load
Calculates potassium delivered by an intravenous fluid or infusion from concentration and volume.
Open toolInfusate Sodium Load
Calculates the sodium dose delivered by an intravenous fluid from concentration and volume.
Open toolINR Therapeutic Range Reference
Provides commonly used warfarin INR target ranges for selected indications.
Open toolInsomnia Severity Index
Assesses perceived insomnia severity and impact over the previous two weeks.
Open toolInspiratory-to-Expiratory Ratio
Calculates the inspiratory-to-expiratory time ratio from inspiratory time and respiratory rate.
Open toolInsulin Infusion Rate Calculator
Calculates infusion rate from a prescribed insulin rate and prepared concentration.
Open toolInsulinogenic Index
Estimates early-phase insulin secretion from fasting and 30-minute oral glucose tolerance test values.
Open toolIntegrated MELD (iMELD)
Calculates integrated MELD using MELD, age and sodium.
Open toolInternational Criteria for Behçet Disease (ICBD)
Applies the International Criteria for Behçet Disease weighted classification score.
Open toolInternational Prognostic Index (IPI)
Calculates the International Prognostic Index for aggressive non-Hodgkin lymphoma.
Open toolInternational Prognostic Score for Advanced Hodgkin Lymphoma
Counts seven adverse prognostic factors in advanced classical Hodgkin lymphoma.
Open toolInternational Prognostic Scoring System for Waldenström Macroglobulinaemia (IPSSWM)
Calculates IPSSWM risk using age, haemoglobin, platelet count, beta-2 microglobulin and monoclonal IgM concentration.
Open toolInternational Staging System for Multiple Myeloma
Assigns multiple myeloma stage from serum beta-2 microglobulin and albumin.
Open toolInternational Staging System for Multiple Myeloma (ISS)
Assigns ISS stage for newly diagnosed multiple myeloma from serum beta-2 microglobulin and albumin.
Open toolIntracerebral Haemorrhage Grading Scale
Grades spontaneous intracerebral haemorrhage severity using GCS, age, volume, location and intraventricular extension.
Open toolISTH Overt DIC Score
Records and interprets a completed ISTH overt DIC score.
Open toolJ
1 toolsK
11 toolsKampala Trauma Score
Calculates the Kampala Trauma Score using age, systolic blood pressure, respiratory rate, neurological status and number of serious injuries.
Open toolKarnofsky Performance Status
Classifies functional performance from 100 to 0 using the Karnofsky Performance Status scale.
Open toolKatz Index of Independence in Activities of Daily Living
Assesses independence in six basic activities of daily living.
Open toolKDIGO Acute Kidney Injury Stage
Stages acute kidney injury using KDIGO serum creatinine and urine-output criteria.
Open toolkg ↔ lb ↔ stone Converter
Converts weight between kilograms, pounds and stones
Open toolKhorana VTE Risk Score
Estimates venous thromboembolism risk in ambulatory patients starting systemic cancer therapy.
Open toolKhorana VTE Risk Score
Calculates the Khorana score for venous thromboembolism risk in ambulatory patients starting systemic cancer therapy.
Open toolKidney Failure Risk Equation — 4 Variable
Estimates 2- and 5-year treated kidney failure risk in CKD stages G3–G5.
Open toolKing\
Applies the classic King’s College Criteria for paracetamol-related acute liver failure.
Open toolKing\
Applies the classic King’s College Criteria for non-paracetamol acute liver failure.
Open toolKocher Criteria for Septic Hip
Supports differentiation of septic arthritis from transient synovitis in children with an irritable hip.
Open toolL
17 toolsLactate Clearance Calculator
Calculates percentage lactate clearance between an initial and repeat measurement.
Open toolLactate to Albumin Ratio
Calculates the serum lactate to albumin ratio.
Open toolLawton Instrumental Activities of Daily Living Scale
Assesses independence in instrumental activities required for community living.
Open toolLean Body Mass Calculator
Estimates adult lean body mass using the Hume equations.
Open toolLean Body Weight (Boer)
Calculates lean body weight using the Boer equation.
Open toolLean Body Weight (Hume)
Calculates lean body weight using the Hume equation.
Open toolLean Body Weight (James)
Calculates lean body weight using the James equation.
Open toolLean Body Weight Calculator
Estimates adult lean body weight using the Janmahasatian equations.
Open toolLEFt Rule for DVT in Pregnancy
Records the three LEFt features associated with DVT in pregnancy.
Open toolLeft Ventricular Fractional Shortening
Calculates left ventricular fractional shortening from end-diastolic and end-systolic internal dimensions.
Open toolLeft Ventricular Mass Index
Calculates left ventricular mass and indexes it to body surface area.
Open toolLeft Ventricular Stroke Work
Estimates left ventricular stroke work from stroke volume, mean arterial pressure and pulmonary artery wedge pressure.
Open toolLeft Ventricular Stroke Work Index
Calculates left ventricular stroke work indexed to body surface area.
Open toolLille Score
Estimates corticosteroid response after treatment for severe alcohol-associated hepatitis.
Open toolLiver Frailty Index
Calculates the Liver Frailty Index from grip strength, timed chair stands and balance performance.
Open toolLRINEC Score
Calculates the Laboratory Risk Indicator for Necrotising Fasciitis from six laboratory measurements.
Open toolLymphocyte-to-Monocyte Ratio
Calculates the lymphocyte-to-monocyte ratio.
Open toolM
55 toolsMaddrey Discriminant Function
Calculates Maddrey discriminant function for severity assessment in alcohol-associated hepatitis.
Open toolMagnesium Sulfate Infusion Calculator
Calculates infusion volume and pump rate from a prescribed magnesium sulfate dose.
Open toolMalnutrition Universal Screening Tool (MUST)
Calculates adult malnutrition risk from BMI, unplanned weight loss and acute-disease effect.
Open toolMALT Lymphoma International Prognostic Index (MALT-IPI)
Calculates MALT-IPI from age, serum LDH and Ann Arbor stage.
Open toolMangled Extremity Severity Score
Calculates the Mangled Extremity Severity Score from skeletal injury, limb ischaemia, shock and age.
Open toolMantle Cell Lymphoma International Prognostic Index (MIPI)
Calculates the continuous MIPI from age, ECOG performance status, LDH ratio and white-cell count.
Open toolMASCC Risk Index
Calculates the MASCC Risk Index for complications in adults with febrile neutropenia.
Open toolMatsuda Insulin Sensitivity Index
Calculates the Matsuda whole-body insulin sensitivity index from oral glucose tolerance test measurements.
Open toolMcLaughlin Massive Transfusion Score
Calculates a four-item early massive-transfusion prediction score using heart rate, systolic pressure, pH and haematocrit.
Open toolMDRD Estimated GFR
Calculates estimated glomerular filtration rate using the four-variable MDRD equation without a race coefficient.
Open toolMean Airway Pressure
Estimates mean airway pressure from peak inspiratory pressure, PEEP, inspiratory time and total respiratory-cycle time.
Open toolMean Arterial Pressure (MAP)
Calculates estimated mean arterial pressure from systolic and diastolic blood pressure.
Open toolMean Arterial Pressure from Systolic and Diastolic Pressure
Estimates mean arterial pressure from systolic and diastolic blood pressure.
Open toolMean Gestational Sac Diameter
Calculates mean gestational sac diameter from three orthogonal ultrasound measurements.
Open toolMean Ocular Perfusion Pressure
Estimates mean ocular perfusion pressure from blood pressure and intraocular pressure.
Open toolMean Uterine Artery Pulsatility Index
Calculates the mean of right and left uterine-artery pulsatility indices.
Open toolMeasured Creatinine Clearance
Calculates creatinine clearance from a timed urine collection.
Open toolMechanical Energy per Breath
Estimates mechanical energy delivered per breath during volume-controlled ventilation.
Open toolMechanical Power of Ventilation
Estimates mechanical power delivered during volume-controlled ventilation using a simplified equation.
Open toolMEDS Sepsis Score
Estimates short-term mortality risk among emergency-department patients with suspected infection.
Open toolMELD 3.0 Score
Calculates MELD 3.0 using bilirubin, INR, creatinine, sodium, albumin and sex.
Open toolMELD Score
Calculates the original MELD score from bilirubin, INR and creatinine.
Open toolMELD-Na Score
Calculates the MELD-Na score from bilirubin, INR, creatinine, sodium and recent dialysis status.
Open toolMELD-to-Sodium Ratio (MESO Index)
Calculates the MESO index from MELD and serum sodium.
Open toolMELD-XI Score
Calculates MELD-XI where INR is unavailable or unsuitable.
Open toolMentzer Index
Calculates the Mentzer index.
Open toolMeropenem Dose Calculator
Calculates a clinician-selected meropenem dose calculator dose.
Open toolmg ↔ micrograms Converter
Converts mass between milligrams and micrograms.
Open toolMGAP Trauma Score
Calculates the Mechanism, Glasgow Coma Scale, Age and arterial Pressure trauma score.
Open toolMifflin–St Jeor Resting Energy Expenditure
Estimates resting energy expenditure from weight, height, age and sex using the Mifflin–St Jeor equation.
Open toolMini Nutritional Assessment – Short Form (MNA-SF)
Screens older adults for malnutrition using the six-item MNA Short Form.
Open toolMinute Ventilation
Calculates minute ventilation from tidal volume and respiratory rate.
Open toolMirels Score
Estimates pathological fracture risk in long-bone metastases using the Mirels score.
Open toolMitral Valve Area by Pressure Half-Time
Estimates mitral valve area from Doppler pressure half-time.
Open toolMixed Venous Oxygen Content
Calculates mixed venous oxygen content from haemoglobin, mixed venous saturation and venous oxygen tension.
Open toolmL ↔ fl oz Converter
Converts millilitres and US or UK imperial fluid ounces.
Open toolmmHg ↔ kPa Converter
Converts pressure between millimetres of mercury and kilopascals.
Open toolmmol/L ↔ mEq/L Converter
Converts mmol/L and mEq/L using the selected ionic valence.
Open toolmmol/L ↔ mg/dL Converter
Converts glucose between mmol/L and mg/dL.
Open toolModified Aldrete Recovery Score
Assesses readiness for discharge from the post-anaesthesia care unit using five recovery domains.
Open toolModified Brooke Burn Formula
Calculates a lower-volume initial 24-hour crystalloid estimate for adult burn resuscitation.
Open toolModified Early Warning Score (MEWS)
Calculates a Modified Early Warning Score from systolic blood pressure, heart rate, respiratory rate, temperature and consciousness.
Open toolModified Ferriman-Gallwey Score
Quantifies terminal hair growth across nine androgen-sensitive body areas when assessing hirsutism.
Open toolModified Fisher Scale
Grades subarachnoid haemorrhage CT appearance to estimate risk of delayed cerebral ischaemia.
Open toolModified Glasgow Prognostic Score
Calculates the modified Glasgow Prognostic Score from CRP and albumin.
Open toolModified Graeb Score
Quantifies intraventricular haemorrhage burden across the ventricular system.
Open toolModified Kocher–Caird Criteria
Adds C-reactive protein to the Kocher predictors for paediatric septic hip assessment.
Open toolModified Mallampati Classification
Classifies the visible oropharyngeal structures from class I to IV as one component of difficult-airway assessment.
Open toolModified NUTRIC Score
Records and interprets a completed modified NUTRIC score without IL-6.
Open toolModified Shock Index
Calculates heart rate divided by mean arterial pressure.
Open toolModified Tal Bronchiolitis Score
Grades bronchiolitis severity in infants using respiratory rate, wheeze, oxygenation and accessory-muscle use.
Open toolMonocyte to Lymphocyte Ratio
Calculates the absolute monocyte-to-lymphocyte ratio.
Open toolMorphine Dose Calculator
Calculates a clinician-selected weight-based morphine dose.
Open toolMorse Fall Scale
Assesses inpatient fall risk using six Morse Fall Scale domains.
Open toolMurray Lung Injury Score
Quantifies acute lung injury from chest radiograph, hypoxaemia, PEEP and respiratory-system compliance.
Open toolN
22 toolsNACSELD-ACLF Organ Failure Count
Counts extrahepatic organ failures used to define and grade NACSELD acute-on-chronic liver failure.
Open toolNAFLD Fibrosis Score
Calculates the NAFLD Fibrosis Score from age, BMI, diabetes or impaired fasting glucose, AST/ALT ratio, platelets and albumin.
Open toolNeonatal Glucose Infusion Rate
Calculates glucose delivery in mg/kg/min from dextrose concentration, infusion rate and infant weight.
Open toolNeonatal Respiratory Severity Score
Calculates the product of mean airway pressure and inspired oxygen fraction in ventilated neonates.
Open toolNeonatal Weight Loss Percentage
Calculates percentage weight loss from birth weight in a newborn infant.
Open toolNeutrophil to Albumin Ratio
Calculates the absolute neutrophil count to albumin ratio.
Open toolNeutrophil-to-Lymphocyte Ratio
Calculates the neutrophil-to-lymphocyte ratio.
Open toolNew Injury Severity Score
Calculates NISS as the sum of squares of the three highest AIS injury scores, regardless of body region.
Open toolNew Orleans Head CT Criteria
Identifies adults with minor head injury who require CT assessment under the New Orleans criteria.
Open toolNEXUS Cervical Spine Criteria
Applies the NEXUS low-risk criteria to support decisions about cervical spine imaging after blunt trauma.
Open toolNEXUS Chest Decision Instrument
Identifies blunt-trauma patients who may require chest imaging using the NEXUS Chest criteria.
Open toolNIH Stroke Scale (NIHSS)
Quantifies neurological impairment in suspected or confirmed acute stroke using the 15 scored NIHSS items.
Open toolNitrogen Balance
Estimates nitrogen balance from daily protein intake, urinary urea nitrogen and an allowance for non-urinary losses.
Open toolNon-HDL Cholesterol
Calculates non-HDL cholesterol from total cholesterol and HDL cholesterol.
Open toolNormal Adult Vital Signs
Provides commonly used resting adult vital-sign reference ranges
Open toolNormal Cerebrospinal Fluid Reference Values
Provides illustrative adult cerebrospinal fluid reference values.
Open toolNormal Laboratory Reference Ranges
Shows illustrative adult laboratory reference intervals.
Open toolNormal Urine Output Reference
Provides concise urine-output thresholds used in adult and paediatric clinical assessment.
Open toolNorton Scale
Assesses pressure-injury risk across physical condition, mental condition, activity, mobility and incontinence.
Open toolNoSAS Score
Screens adults for risk of clinically significant sleep-disordered breathing using neck circumference, obesity, snoring, age and sex.
Open toolNUTRIC Score
Records and interprets a completed Nutrition Risk in the Critically Ill score.
Open toolNutritional Risk Screening 2002 (NRS-2002)
Screens hospital patients for nutritional risk using nutritional impairment, disease severity and age.
Open toolO
18 toolsOakland Score
Records and interprets a completed Oakland Score for acute lower gastrointestinal bleeding.
Open toolObstetric Shock Index
Calculates shock index from heart rate and systolic blood pressure in an obstetric patient.
Open toolOcular Trauma Score
Estimates visual prognosis after serious ocular trauma.
Open toolOESIL Score for Syncope
Estimates 12-month mortality after syncope using four clinical predictors.
Open toolOral Disposition Index
Combines insulin sensitivity and insulin secretion estimates to describe beta-cell compensation.
Open toolORBIT Bleeding Score
Estimates major bleeding risk in adults with atrial fibrillation receiving oral anticoagulation.
Open toolOsmolal Clearance
Calculates osmolal clearance from urine osmolality, urine flow and plasma osmolality.
Open toolOsmolal Gap (SI Units)
Calculates the osmolal gap from measured and calculated serum osmolality using SI units.
Open toolOsmolar Gap Calculator
Calculates the osmolar gap from measured and calculated serum osmolality.
Open toolOttawa Ankle Rules
Assesses whether ankle or foot radiography is indicated after an acute injury using the Ottawa Ankle Rules.
Open toolOttawa Knee Rule
Applies the Ottawa Knee Rule after acute knee injury.
Open toolOxygen Consumption by Fick Principle
Calculates oxygen consumption from cardiac output and arterial–venous oxygen content difference.
Open toolOxygen Consumption Index (VO₂I)
Calculates indexed systemic oxygen consumption from cardiac index and the arterial–venous oxygen-content difference using the Fick principle.
Open toolOxygen Delivery Index
Calculates indexed systemic oxygen delivery from cardiac index and arterial oxygen content.
Open toolOxygen Extraction Ratio
Calculates the proportion of delivered oxygen extracted by tissues.
Open toolOxygen Saturation Index
Calculates oxygen saturation index from FiO₂, mean airway pressure and SpO₂.
Open tooloxygen_scale
Clinical calculator for oxygen_scale.
Open toolOxygenation Index
Calculates oxygenation index from FiO₂, mean airway pressure and PaO₂.
Open toolP
58 toolsPADUA Nephrometry Score
Standardises preoperative anatomic complexity of renal tumours.
Open toolPadua Prediction Score
Assesses venous thromboembolism risk in hospitalised medical patients.
Open toolPaediatric Age-Adjusted Shock Index (SIPA)
Calculates paediatric shock index and compares it with commonly used age-adjusted upper thresholds.
Open toolPaediatric Appendicitis Score
Calculates the 10-point Paediatric Appendicitis Score.
Open toolPaediatric Early Warning Score (Brighton PEWS)
Calculates the Brighton Paediatric Early Warning Score from behaviour, cardiovascular and respiratory observations, with two optional additional factors.
Open toolPaediatric Glasgow Coma Scale
Calculates a paediatric-adapted Glasgow Coma Scale score.
Open toolPaediatric Respiratory Assessment Measure
Calculates PRAM asthma-exacerbation severity in children using five clinical findings.
Open toolPain Assessment in Advanced Dementia
Observational pain score for people with advanced dementia who cannot reliably self-report.
Open toolPalliative Performance Scale
Records the Palliative Performance Scale using standard 10% categories.
Open toolPalliative Prognostic Index (PPI)
Estimates short-term survival in advanced illness using PPS, oral intake, oedema, dyspnoea at rest and delirium.
Open toolPan-Immune-Inflammation Value
Calculates the pan-immune-inflammation value from neutrophils, monocytes, platelets and lymphocytes.
Open toolPaO₂/FiO₂ Ratio
Calculates the arterial oxygen tension to inspired oxygen fraction ratio.
Open toolParacetamol IV Dose Calculator
Calculates a protocol-selected weight-based intravenous paracetamol dose.
Open toolParacetamol Nomogram Treatment Line
Calculates the concentration on the 150-line paracetamol treatment nomogram for a stated time after a single acute ingestion.
Open toolParkland Burn Resuscitation Formula
Calculates the initial 24-hour crystalloid estimate for major burns.
Open toolPassive Leg Raise Cardiac Output Change
Calculates percentage change in cardiac output or stroke volume during a passive leg raise.
Open toolPECARN Blunt Abdominal Trauma Rule
Identifies children at very low risk of intra-abdominal injury requiring acute intervention after blunt torso trauma.
Open toolPECARN Head Injury Rule – Age 2 Years and Older
Applies the PECARN head trauma prediction rule for children aged 2 years and older.
Open toolPECARN Head Injury Rule – Under 2 Years
Applies the PECARN head trauma prediction rule for children younger than 2 years.
Open toolPediatric Trauma Score
Summarises injury severity in children using weight, airway, blood pressure, CNS status, wounds and skeletal injury.
Open toolPELOD-2 Score
Quantifies paediatric multiple-organ dysfunction using neurologic, cardiovascular, renal, respiratory and haematologic variables.
Open toolPERC Rule
Apply the eight Pulmonary Embolism Rule-out Criteria in adults with a clinician-assessed low pretest probability of pulmonary embolism.
Open toolPercentage Free PSA
Calculates free PSA as a percentage of total PSA.
Open toolPERCRule
Clinical calculator for PERCRule.
Open toolPhenobarbital Concentration-Targeted Supplemental Dose
Calculates a supplemental phenobarbital amount required to move from a measured concentration to a selected target using an apparent distribution volume.
Open toolPhenobarbital Loading Dose
Calculates a model-based phenobarbital loading dose from body weight, apparent volume of distribution, current concentration and target concentration.
Open toolPhosphate Weak-Acid Charge
Estimates the negative charge contributed by inorganic phosphate at a specified pH.
Open toolPHQ-2 Depression Screen
Two-item depression screening instrument covering mood and anhedonia.
Open toolPHQ-9 Depression Severity
Assesses depressive symptom severity over the preceding two weeks.
Open toolPhysiologic Dead Space by Bohr Equation
Calculates the physiologic dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolPhysiological Dead Space Fraction (Bohr)
Calculates physiological dead-space fraction using arterial and mixed-expired carbon dioxide.
Open toolPiperacillin/Tazobactam Dose Calculator
Calculates a clinician-selected piperacillin/tazobactam dose calculator dose.
Open toolPitt Bacteremia Score
Quantifies acute severity in patients with bloodstream infection.
Open toolPittsburgh Knee Rule
Applies the Pittsburgh Knee Rule after blunt trauma or a fall.
Open toolPLASMIC Score
Calculates the PLASMIC score in suspected thrombotic microangiopathy.
Open toolPlatelet-to-Lymphocyte Ratio
Calculates the platelet-to-lymphocyte ratio.
Open toolPlatelet–Albumin–Bilirubin (PALBI) Grade
Calculates PALBI score and grade from bilirubin, albumin and platelet count.
Open toolPneumonia Severity Index (PSI/PORT)
Calculates the PSI/PORT score and risk class for adults with community-acquired pneumonia.
Open toolPost-Anaesthetic Discharge Scoring System (PADSS)
Assesses readiness for discharge after ambulatory anaesthesia using vital signs, activity, nausea, pain and bleeding.
Open toolPRECISE-DAPT Score
Estimates out-of-hospital bleeding risk during dual antiplatelet therapy after PCI.
Open toolPregnancy Booking BMI
Calculates body mass index from booking weight and height.
Open toolPrognostic Nutritional Index
Calculates Onodera prognostic nutritional index from albumin and lymphocyte count.
Open toolProportional Maintenance Dose Adjustment
Calculates a proportional new maintenance dose from the current dose, measured concentration and desired concentration.
Open toolProstate-Specific Antigen Density
Calculates serum PSA relative to prostate volume.
Open toolPSA Doubling Time
Estimates PSA doubling time from two rising measurements.
Open toolPsoriasis Area and Severity Index
Quantifies psoriasis severity from lesion features and affected body surface area.
Open toolPulmonary Artery Compliance
Calculates pulmonary artery compliance from stroke volume and pulmonary artery pulse pressure.
Open toolPulmonary Artery Pulsatility Index
Calculates pulmonary artery pulsatility index from pulmonary artery pressures and right atrial pressure.
Open toolPulmonary Artery Pulse Pressure
Calculates pulmonary artery pulse pressure from systolic and diastolic pulmonary artery pressures.
Open toolPulmonary Embolism Severity Index (PESI)
Risk-stratifies patients with acute pulmonary embolism using the original Pulmonary Embolism Severity Index.
Open toolPulmonary Shunt Fraction
Calculates pulmonary shunt fraction from end-capillary, arterial and mixed venous oxygen content.
Open toolPulmonary Vascular Resistance
Calculates pulmonary vascular resistance from mean pulmonary artery pressure, wedge pressure and cardiac output.
Open toolPulmonary Vascular Resistance (Wood Units)
Calculates pulmonary vascular resistance in Wood units.
Open toolPulmonary Vascular Resistance Index
Calculates indexed pulmonary vascular resistance from mean pulmonary artery pressure, wedge pressure and cardiac index.
Open toolPulmonary-to-Systemic Flow Ratio
Calculates Qp:Qs from oxygen saturations using the Fick principle.
Open toolPulse Pressure
Calculates pulse pressure from systolic and diastolic blood pressure.
Open toolPulse Pressure Variation
Calculates respiratory pulse-pressure variation from maximum and minimum arterial pulse pressure.
Open toolPUQE-24 Score
Grades nausea and vomiting severity during pregnancy over the preceding 24 hours.
Open toolQ
3 toolsQuick COVID-19 Severity Index (qCSI)
Estimates risk of critical respiratory illness within 24 hours in adults admitted with COVID-19.
Open toolQuick Pitt Bacteremia Score
Rapidly estimates mortality risk in Gram-negative bloodstream infection.
Open toolQUICKI Insulin Sensitivity Index
Calculates the quantitative insulin sensitivity check index from fasting insulin and glucose.
Open toolR
37 toolsR Factor for Liver Injury
Calculates the R factor to classify hepatocellular, cholestatic or mixed liver injury.
Open toolR.E.N.A.L. Nephrometry Score
Standardises anatomic complexity assessment of a renal mass.
Open toolRanson's Criteria
Calculates Ranson criteria for severity assessment in non-gallstone acute pancreatitis.
Open toolRAPID Pleural Infection Score
Predicts mortality in pleural infection using renal function, age, purulence, infection source and albumin.
Open toolRapid Shallow Breathing Index
Calculates the rapid shallow breathing index from respiratory rate and spontaneous tidal volume.
Open toolRate Pressure Product
Calculates rate-pressure product from heart rate and systolic blood pressure.
Open toolRed Cell Distribution Width Index
Calculates the RDW Index from MCV, RDW and red blood cell count.
Open toolRegiSCAR DRESS Validation Score
Supports classification of suspected drug reaction with eosinophilia and systemic symptoms.
Open toolRelative Wall Thickness
Calculates left ventricular relative wall thickness from posterior wall thickness and end-diastolic diameter.
Open toolRemnant Cholesterol
Estimates remnant cholesterol from total cholesterol, LDL cholesterol and HDL cholesterol.
Open toolRenal Angina Index
Screens critically ill children for risk of severe acute kidney injury by multiplying risk and injury strata.
Open toolRenal Failure Index
Calculates the renal failure index from urine sodium and paired urine and plasma creatinine.
Open toolRenal Net Acid Excretion
Calculates net renal acid excretion from urinary ammonium, titratable acid and bicarbonate excretion.
Open toolRespiratory Quotient
Calculates respiratory quotient from carbon dioxide production and oxygen consumption measured in the same units.
Open toolRespiratory System Stress Index
Calculates a simplified stress index from three airway-pressure measurements during constant-flow inflation.
Open toolReticulocyte Production Index
Calculates a reticulocyte production index.
Open toolREVEAL Lite 2 Risk Score
Provides an abridged pulmonary arterial hypertension risk estimate using six non-invasive variables.
Open toolRevised Baux Score
Estimates burn mortality risk from age, total body surface area burned and inhalation injury.
Open toolRevised Cardiac Risk Index (RCRI)
Estimates perioperative cardiac risk using the six Lee index predictors.
Open toolRevised Geneva Score
Estimates pre-test probability of pulmonary embolism using objective clinical variables.
Open toolRevised Harris–Benedict Resting Energy Expenditure
Estimates resting energy expenditure using the revised Harris–Benedict equations.
Open toolRevised International Prognostic Index (R-IPI)
Risk-stratifies patients with diffuse large B-cell lymphoma treated with rituximab-based therapy.
Open toolRevised International Prognostic Scoring System for MDS (IPSS-R)
Calculates the IPSS-R prognostic score and risk category for untreated primary myelodysplastic syndromes.
Open toolRevised International Staging System for Multiple Myeloma (R-ISS)
Assigns R-ISS stage using ISS stage, LDH and high-risk cytogenetic abnormalities.
Open toolRevised IPSET-Thrombosis for Essential Thrombocythaemia
Classifies thrombosis risk in essential thrombocythaemia using age, thrombosis history and JAK2 V617F mutation status.
Open toolRevised Trauma Score
Calculates the triage and weighted Revised Trauma Score from Glasgow Coma Scale, systolic blood pressure and respiratory rate.
Open toolRichmond Agitation-Sedation Scale (RASS)
Grades agitation and sedation from +4 to −5 using the Richmond Agitation-Sedation Scale.
Open toolRIFLE AKI Classification
Classifies AKI using RIFLE creatinine/GFR and urine-output criteria.
Open toolRight Ventricular Stroke Work
Estimates right ventricular stroke work from stroke volume, mean pulmonary artery pressure and central venous pressure.
Open toolRight Ventricular Stroke Work Index
Calculates right ventricular stroke work indexed to body surface area.
Open toolrisk_factors
Learn how each risk factor contributes to stroke risk assessment in atrial fibrillation.
Open toolRobson Ten-Group Classification
Classifies women undergoing childbirth into one of ten mutually exclusive obstetric groups.
Open toolRochester Low-Risk Criteria
Classifies selected febrile infants aged 60 days or younger using the original Rochester low-risk criteria.
Open toolRoper–Hall Ocular Burn Classification
Classifies acute ocular surface burns using corneal appearance and limbal ischaemia.
Open toolROSE Rule for Syncope
Screens for one-month serious outcome or death after emergency-department syncope.
Open toolROX Index
Calculates the ROX Index from oxygen saturation, inspired oxygen fraction and respiratory rate.
Open toolROX–Heart Rate Index
Calculates a heart-rate-adjusted ROX index from oxygen saturation, inspired oxygen, respiratory rate and heart rate.
Open toolS
53 toolsS O F A Score
Provides the S O F A Score clinical calculation or assessment.
Open toolSan Francisco Syncope Rule
Screens for short-term serious outcome risk after syncope using the CHESS criteria.
Open toolSAPS 3 Score
Converts a completed SAPS 3 admission score into the global model mortality estimate.
Open toolSAPS II Score
Converts a completed SAPS II total into the original model mortality estimate.
Open toolSARC-F Sarcopenia Screen
Five-item screen for risk of sarcopenia.
Open toolSCAP Severe Community-Acquired Pneumonia Score
Identifies severe community-acquired pneumonia using major and minor clinical criteria.
Open toolSCORTEN for Epidermal Necrolysis
Estimates mortality risk in Stevens–Johnson syndrome and toxic epidermal necrolysis.
Open toolSecond Revision of the International Staging System for Multiple Myeloma (R2-ISS)
Calculates R2-ISS stage using ISS, LDH, del(17p), t(4;14) and 1q gain or amplification.
Open toolSEDAN Score for Intracranial Haemorrhage
Estimates risk of symptomatic intracranial haemorrhage after intravenous thrombolysis.
Open toolSepsis-Induced Coagulopathy (SIC) Score
Calculates the SIC score from platelet count, PT-INR and the four-organ SOFA component score.
Open toolSerum Globulin Calculator
Calculates serum globulin from total protein and albumin.
Open toolShepard Estimated Fetal Weight
Estimates fetal weight from biparietal diameter and abdominal circumference using the Shepard equation.
Open toolShine and Lal Index
Calculates the Shine and Lal red-cell discrimination index.
Open toolShock Index
Calculates heart rate divided by systolic blood pressure as a rapid marker of haemodynamic compromise.
Open toolShort Nutritional Assessment Questionnaire
Brief inpatient screen for malnutrition based on weight loss, appetite and supplements/tube feeding.
Open toolSilverman-Andersen Respiratory Severity Score
Grades neonatal respiratory distress using chest movement, retractions, xiphoid retraction, nasal flaring and expiratory grunt.
Open toolSimplified Disease Activity Index (SDAI)
Calculates rheumatoid arthritis activity using joint counts, global assessments and CRP.
Open toolSimplified PESI (sPESI)
Estimates 30-day mortality risk in acute pulmonary embolism using the simplified Pulmonary Embolism Severity Index.
Open toolSimplified Strong Ion Difference
Calculates a simplified plasma strong ion difference from sodium, potassium and chloride.
Open toolSingle Deepest Pocket
Interprets the maximum vertical amniotic-fluid pocket measured by ultrasound.
Open toolSingle-Pool Kt/V
Calculates single-pool Kt/V for haemodialysis using the second-generation Daugirdas equation.
Open toolSIRS Criteria
Counts systemic inflammatory response syndrome criteria from temperature, pulse, respiration and white cell findings.
Open toolSLEDAI-2K
Calculates the SLE Disease Activity Index 2000 from weighted manifestations present during the assessment window.
Open toolSMART-COP Score
Records and interprets a completed SMART-COP score.
Open toolSNAPPE-II Score
Estimates neonatal illness severity and mortality risk using physiologic derangement plus birth characteristics.
Open toolSnellen and LogMAR Visual Acuity Converter
Converts a Snellen visual-acuity fraction to logMAR and an equivalent decimal acuity.
Open toolSodium Deficit
Estimates sodium deficit from total body water and current and target sodium.
Open toolSodium–Chloride Difference
Calculates the numerical difference between serum sodium and chloride as a simple chloride-related acid–base marker.
Open toolSOFA Score
Assess dysfunction across six organ systems using the Sequential Organ Failure Assessment score.
Open toolSokal Score for Chronic Myeloid Leukaemia
Calculates the Sokal prognostic score at CML diagnosis.
Open toolSokolow-Lyon Index
Calculates the Sokolow-Lyon ECG voltage criterion for left ventricular hypertrophy.
Open toolSPAN-100 Index
Flags patients whose age plus NIHSS is at least 100 before thrombolysis.
Open toolSpO₂/FiO₂ Ratio
Calculates the peripheral oxygen saturation to inspired oxygen fraction ratio.
Open toolStatic Lung Compliance
Calculates static respiratory-system compliance during mechanical ventilation.
Open toolStep-by-Step Febrile Infant Assessment
Risk-stratifies well-defined febrile infants using age, appearance, urinalysis, procalcitonin, CRP and ANC.
Open toolSTONE Score for Ureteral Stone
Estimates the likelihood of uncomplicated ureteral stone in selected adults with flank pain.
Open toolSTOP-BANG Questionnaire
Screens adults for risk of obstructive sleep apnoea using eight STOP-BANG items.
Open toolSTRATIFY Falls Risk Assessment
Five-item inpatient falls risk assessment tool.
Open toolStroke Volume Calculator
Calculates stroke volume from LVOT diameter and velocity-time integral.
Open toolStroke Volume Index
Indexes stroke volume to body surface area.
Open toolStroke Volume Variation
Calculates respiratory stroke-volume variation from maximum and minimum stroke volume.
Open toolStrong Ion Gap
Calculates the strong ion gap from apparent strong ion difference, bicarbonate, albumin and phosphate.
Open toolSurgical Apgar Score
Grades condition at the end of surgery using estimated blood loss, lowest mean arterial pressure and lowest heart rate.
Open toolSurgical Outcome Risk Tool (SORT)
Estimates 30-day mortality after inpatient non-cardiac surgery from six preoperative variables.
Open toolSystemic Immune-Inflammation Index
Calculates the systemic immune-inflammation index from platelets, neutrophils and lymphocytes.
Open toolSystemic Inflammation Response Index
Calculates the systemic inflammation response index from neutrophils, monocytes and lymphocytes.
Open toolSystemic Oxygen Consumption
Calculates systemic oxygen consumption from cardiac output and arteriovenous oxygen content difference.
Open toolSystemic Oxygen Delivery
Calculates systemic oxygen delivery from cardiac output and arterial oxygen content.
Open toolSystemic Perfusion Pressure Gradient
Calculates the systemic perfusion pressure gradient from mean arterial and central venous pressures.
Open toolSystemic Vascular Resistance
Calculates systemic vascular resistance from mean arterial pressure, central venous pressure and cardiac output.
Open toolSystemic Vascular Resistance (Wood Units)
Calculates systemic vascular resistance in Wood units.
Open toolSystemic Vascular Resistance Index
Calculates systemic vascular resistance index from mean arterial pressure, central venous pressure and cardiac index.
Open toolSystemic Vascular Resistance Index
Calculates indexed systemic vascular resistance from mean arterial pressure, central venous pressure and cardiac index.
Open toolT
24 toolsTHRIVE Score for Ischaemic Stroke
Predicts outcome and mortality after acute ischaemic stroke using age, NIHSS and comorbidities.
Open toolTimed Urine Creatinine Excretion
Calculates daily creatinine excretion from urine creatinine concentration, volume and collection duration.
Open toolTimed Urine Protein Excretion
Calculates total protein excretion from urine protein concentration and timed urine volume.
Open toolTIMI Risk Index
Calculates the TIMI Risk Index from age, heart rate and systolic blood pressure.
Open toolTIMI Risk Score for STEMI
Estimates 30-day mortality risk at presentation in ST-elevation myocardial infarction.
Open toolTIMI Risk Score for UA/NSTEMI
Calculates the seven-variable TIMI risk score for unstable angina and non-ST-elevation myocardial infarction.
Open toolTmP/GFR Calculator
Calculates the renal tubular maximum reabsorption of phosphate relative to GFR using the Bijvoet equation.
Open toolTobramycin Extended-Interval Concentration Projection
Projects a measured Tobramycin concentration to a future time using an individual elimination rate constant.
Open toolTobramycin Extrapolated Post-Distribution Peak
Back-extrapolates a measured post-distribution Tobramycin concentration to a selected peak reference time.
Open toolTobramycin Projected Trough Concentration
Projects a post-distribution Tobramycin concentration forward to the end of the dosing interval.
Open toolTobramycin Two-Level Elimination Rate Constant
Calculates the first-order elimination rate constant for Tobramycin from two post-distribution serum concentrations and their sampling times.
Open toolTobramycin Two-Level Half-Life
Calculates the apparent elimination half-life of Tobramycin from two post-distribution concentrations.
Open toolTotal Body Water (Watson)
Estimates total body water using the Watson sex-specific equation.
Open toolTotal Iron-Binding Capacity from Transferrin
Estimates total iron-binding capacity from serum transferrin.
Open toolTransferrin Saturation
Calculates transferrin saturation from serum iron and total iron-binding capacity.
Open toolTranspulmonary Gradient
Calculates the transpulmonary pressure gradient.
Open toolTranstubular Potassium Gradient
Calculates the transtubular potassium gradient.
Open toolTrauma-Associated Severe Haemorrhage (TASH) Score
Calculates the TASH score to estimate risk of massive transfusion after severe trauma.
Open toolTriglyceride-to-HDL Cholesterol Ratio
Calculates the triglyceride-to-HDL cholesterol ratio.
Open toolTriglyceride–Glucose Index
Calculates the TyG index from fasting triglycerides and fasting glucose.
Open toolTRISS Survival Probability
Estimates survival probability from Revised Trauma Score, Injury Severity Score, age group and blunt or penetrating mechanism using original MTOS coefficients.
Open toolTubular Reabsorption of Phosphate
Calculates tubular reabsorption of phosphate from paired serum and urine phosphate and creatinine.
Open toolTwo-Level Elimination Rate Constant
Calculates a first-order elimination rate constant from two post-distribution concentrations and their sampling times.
Open toolTyG–BMI Index
Combines the triglyceride–glucose index with body mass index.
Open toolU
16 toolsUKELD Score
Calculates the UK Model for End-Stage Liver Disease score.
Open toolUnsaturated Iron-Binding Capacity
Calculates unsaturated iron-binding capacity from TIBC and serum iron.
Open toolUrea Reduction Ratio
Calculates haemodialysis urea reduction ratio from pre- and post-dialysis measurements.
Open toolUrea to Albumin Ratio
Calculates the blood urea to albumin ratio.
Open toolUric Acid Clearance
Calculates uric acid clearance from urine and serum uric acid and timed urine flow.
Open toolUrine Albumin Excretion Rate
Calculates timed urine albumin excretion rate from concentration, collected volume and duration.
Open toolUrine Albumin–Creatinine Ratio
Calculates urine albumin-to-creatinine ratio in mg/mmol.
Open toolUrine Anion Gap
Calculates the urine anion gap from urine sodium, potassium and chloride.
Open toolUrine C-Peptide–Creatinine Ratio
Calculates urine C-peptide to creatinine ratio as a marker of endogenous insulin secretion.
Open toolUrine Calcium-to-Creatinine Ratio
Calculates the spot urine calcium-to-creatinine ratio from molar concentrations.
Open toolUrine Osmolal Gap
Calculates the urine osmolal gap from measured urine osmolality and major measured urinary solutes.
Open toolUrine Potassium–Creatinine Ratio
Calculates the spot urine potassium-to-creatinine ratio as an aid to assessing renal potassium loss.
Open toolUrine Protein–Creatinine Ratio
Calculates a spot urine protein-to-creatinine ratio in mg/g.
Open toolUrine Sodium-to-Potassium Ratio
Calculates the urine sodium-to-potassium concentration ratio.
Open toolUrine Urea-to-Creatinine Ratio
Calculates the urine urea-to-creatinine concentration ratio.
Open toolUrine-to-Blood PCO₂ Gradient
Calculates the urine-to-blood PCO₂ gradient used during selected urinary acidification assessments.
Open toolV
11 toolsVancomycin Extrapolated Post-Distribution Peak
Back-extrapolates a measured vancomycin concentration to a selected post-infusion reference time.
Open toolVancomycin Loading Dose
Calculates a protocol-selected weight-based vancomycin loading dose
Open toolVancomycin Maintenance Dose
Calculates a protocol-selected weight-based vancomycin maintenance dose
Open toolVancomycin Projected Trough Concentration
Projects a measured vancomycin concentration to the end of the dosing interval.
Open toolVancomycin Trapezoidal AUC24 Estimate
Estimates vancomycin AUC24 from a post-distribution peak, trough, elimination rate constant, infusion duration and dosing interval using a one-compartment first-order method.
Open toolVancomycin Two-Level Elimination Rate Constant
Calculates a vancomycin elimination rate constant from two post-distribution concentrations.
Open toolVancomycin Two-Level Half-Life
Calculates apparent vancomycin half-life from two post-distribution concentrations.
Open toolVasoactive-Inotropic Score
Calculates the vasoactive-inotropic score from current infusion rates.
Open toolVenous Oxygen Content
Calculates venous oxygen content from haemoglobin, venous oxygen saturation and venous oxygen tension.
Open toolVentilatory Ratio
Calculates ventilatory ratio.
Open toolVTE-BLEED Score
Estimates bleeding risk during stable anticoagulation after venous thromboembolism.
Open toolW
7 toolsWaterlow Score
Assesses pressure-ulcer risk using the Waterlow risk-assessment domains.
Open toolWells Score For DVT
Provides the criteria clinical calculation or assessment.
Open toolWells Score For PE
Provides the criteria clinical calculation or assessment.
Open toolWestley Croup Score
Calculates the Westley score for clinical severity of croup.
Open toolWFNS Subarachnoid Haemorrhage Grade
Grades aneurysmal subarachnoid haemorrhage using GCS and focal motor deficit.
Open toolWinter’s Formula
Calculates the expected PaCO₂ range for respiratory compensation in metabolic acidosis.
Open toolWood-Downes-Ferrés Asthma Score
Grades acute paediatric asthma severity using wheeze, retractions, respiratory rate, heart rate, air entry and cyanosis.
Open toolY
1 toolsZ
1 tools#
14 tools2010 ACR/EULAR Rheumatoid Arthritis Classification Criteria
Applies the 2010 classification score in patients with clinical synovitis not better explained by another disease.
Open tool2013 ACR/EULAR Systemic Sclerosis Classification Criteria
Applies the 2013 weighted systemic sclerosis classification criteria.
Open tool2015 ACR/EULAR Gout Classification Criteria
Applies the weighted 2015 gout classification score after the required entry criterion is met.
Open tool2016 Fibromyalgia Diagnostic Criteria
Assesses the 2016 fibromyalgia criteria using widespread pain, symptom severity and generalised pain.
Open tool2019 EULAR/ACR SLE Classification Criteria
Supports SLE classification after a positive ANA entry criterion, using the highest weighted item in each domain.
Open tool2023 Duke-ISCVID Criteria
Classifies infective endocarditis using entered pathological, major and minor Duke-ISCVID criteria.
Open tool4-2-1 Hourly Maintenance Fluids
Calculates traditional hourly paediatric maintenance fluid rate.
Open tool4AT Rapid Delirium Assessment
Rapid screening instrument for delirium and cognitive impairment.
Open tool4C Deterioration Score
Records and interprets a completed ISARIC 4C Deterioration Score.
Open tool4C Mortality Score
Estimates in-hospital mortality risk for adults admitted with COVID-19 using the ISARIC 4C Mortality Score.
Open tool4Ts Score for Heparin-Induced Thrombocytopenia
Estimates pre-test probability of immune heparin-induced thrombocytopenia.
Open tool4Ts Score for HIT
Calculates the 4Ts score for heparin-induced thrombocytopenia.
Open tool4–2–1 Hourly Maintenance Fluid Rate
Calculates estimated hourly maintenance fluid using the 4–2–1 rule.
Open toolµmol/L ↔ mg/dL Converter
Converts selected laboratory analytes between µmol/L and mg/dL.
Open tool