Clinical discovery
Find a Clinical Tool
Search and filter 200 published calculators, scores, references and decision tools.
Cardiology
23 toolsAdult ECG Rate and Interval Reference
Provides concise adult ECG rate and interval reference values.
Open toolATRIA Bleeding Score
Estimates haemorrhage risk in adults with atrial fibrillation receiving anticoagulation.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
Open toolCHA2DS2 VASc
Estimates stroke risk factors in atrial fibrillation using the CHA₂DS₂-VASc score.
Open toolCHA₂DS₂-VA Score
Estimates thromboembolic risk factors in atrial fibrillation without assigning a point for sex.
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 toolDuke Treadmill Score
Calculates the Duke Treadmill Score from exercise duration, ST deviation and exercise angina.
Open toolECG QTc Normal Ranges
Provides commonly used adult QTc interpretation thresholds.
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 presenting with suspected acute coronary syndrome using history, ECG, age, risk factors and troponin.
Open toolH₂FPEF Score
Calculates the H₂FPEF score for unexplained dyspnoea and suspected HFpEF.
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 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 toolSokolow-Lyon Index
Calculates the Sokolow-Lyon ECG voltage criterion for left ventricular hypertrophy.
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 toolClinical Pharmacology
15 toolsAdrenaline Anaphylaxis Dose Calculator
Calculates a protocol-selected intramuscular adrenaline dose for anaphylaxis.
Open toolAmoxicillin Paediatric Dose Calculator
Calculates a clinician-selected weight-based paediatric amoxicillin dose.
Open toolEnoxaparin Dose Calculator
Calculates a clinician-selected weight-based enoxaparin dose.
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 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 toolPiperacillin/Tazobactam Dose Calculator
Calculates a clinician-selected piperacillin/tazobactam dose calculator dose.
Open toolVancomycin Loading Dose
Calculates a protocol-selected weight-based vancomycin loading dose.
Open toolCritical Care
18 toolsAdult Ventilator Reference Values
Provides concise adult invasive ventilation reference concepts.
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 toolFOUR Score
Assesses consciousness using eye response, motor response, brainstem reflexes and respiration.
Open toolLactate Clearance Calculator
Calculates percentage lactate clearance between an initial and repeat measurement.
Open toolModified NUTRIC Score
Records and interprets a completed modified NUTRIC score without IL-6.
Open toolNational Early Warning Score 2
Assesses acute illness severity and risk of clinical deterioration.
Open toolNUTRIC Score
Records and interprets a completed Nutrition Risk in the Critically Ill score.
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 toolqSOFA Score
Assesses risk of poor outcomes in patients with suspected infection.
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 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 toolSIRS Criteria
Counts systemic inflammatory response syndrome criteria from temperature, pulse, respiration and white-cell findings.
Open toolSOFA Score
Assess dysfunction across six organ systems using the Sequential Organ Failure Assessment score.
Open toolVentilatory Ratio
Calculates ventilatory ratio.
Open toolEmergency Medicine
21 toolsCanadian 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 following emergency department assessment of syncope.
Open toolGlasgow Coma Scale
Assesses level of consciousness using the best observed eye, verbal and motor responses.
Open toolHestia Criteria
Identifies exclusion criteria for outpatient treatment of confirmed acute pulmonary embolism.
Open toolModified Shock Index
Calculates heart rate divided by mean arterial pressure.
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
Applies the NEXUS Chest criteria in blunt trauma.
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
Pulmonary Embolism Rule-out Criteria for identifying adults with a clinician-assessed low pretest probability of pulmonary embolism who meet all eight negative PERC criteria.
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 Geneva Score
Estimates pre-test probability of pulmonary embolism using objective clinical variables.
Open toolRevised Trauma Score
Calculates the triage Revised Trauma Score from Glasgow Coma Scale, systolic blood pressure and respiratory rate.
Open toolSan Francisco Syncope Rule
Screens for short-term serious outcome risk after syncope using 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 toolWells Score for Pulmonary Embolism
Estimates the clinical probability of pulmonary embolism.
Open toolWells-Score DVT
Estimates the clinical probability of deep vein thrombosis.
Open toolYEARS Algorithm
Applies the YEARS pulmonary embolism criteria and D-dimer threshold.
Open toolEndocrinology
3 toolsEndocrinology / 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.
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 acute pancreatitis severity.
Open toolGeneral Medicine
29 toolsAdult Pain Score Reference
Provides concise numeric, visual analogue and verbal pain-scale references.
Open toolAnion Gap
Calculates the serum anion gap with or without potassium.
Open toolBicarbonate Deficit
Estimates bicarbonate deficit.
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 toolCalculated Serum Osmolality
Calculates estimated serum osmolality from sodium, glucose and BUN.
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 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 toolDelta Ratio
Calculates the delta ratio in high-anion-gap metabolic acidosis.
Open toolIdeal Body Weight
Calculates Ideal Body Weight using the Devine formula.
Open toolkg ↔ lb ↔ stone Converter
Converts weight between kilograms, pounds and stones.
Open toolMean Arterial Pressure (MAP)
Calculates estimated 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 toolModified Early Warning Score (MEWS)
Calculates a Modified Early Warning Score from systolic blood pressure, heart rate, respiratory rate, temperature and consciousness.
Open toolMorse Fall Scale
Assesses inpatient fall risk using six Morse Fall Scale domains.
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 toolPadua Prediction Score
Assesses venous thromboembolism risk in hospitalised medical patients.
Open toolVancomycin Maintenance Dose
Calculates a protocol-selected weight-based vancomycin maintenance dose.
Open toolWaterlow Score
Assesses pressure-ulcer risk using the Waterlow risk-assessment domains.
Open toolµmol/L ↔ mg/dL Converter
Converts selected laboratory analytes between µmol/L and mg/dL.
Open toolGeneral Practice
1 toolsGeriatrics
3 toolsClinical 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 toolMini Nutritional Assessment – Short Form (MNA-SF)
Screens older adults for malnutrition using the six-item MNA Short Form.
Open toolHaematology
8 tools4Ts Score for HIT
Calculates the 4Ts score for heparin-induced thrombocytopenia.
Open toolAbsolute Eosinophil Count
Calculates absolute eosinophil count.
Open toolAbsolute Neutrophil Count
Calculates absolute neutrophil count.
Open toolCorrected Reticulocyte Count
Calculates corrected reticulocyte percentage from patient and reference haematocrit.
Open toolISTH Overt DIC Score
Records and interprets a completed ISTH overt DIC score.
Open toolMentzer Index
Calculates the Mentzer index.
Open toolPLASMIC Score
Calculates the PLASMIC score in suspected thrombotic microangiopathy.
Open toolReticulocyte Production Index
Calculates a reticulocyte production index.
Open toolHepatology
14 toolsALBI Score
Calculates the albumin-bilirubin score.
Open toolAST to Platelet Ratio Index
Calculates APRI from AST, AST upper limit and platelet count.
Open toolChild-Pugh Score
Classifies cirrhosis severity using bilirubin, albumin, INR, ascites and hepatic encephalopathy.
Open toolDe Ritis Ratio
Calculates the AST to ALT ratio.
Open toolFIB-4 Index
Calculates the FIB-4 index from age, AST, ALT and platelets.
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 toolKing's College Criteria – Non-Paracetamol
Applies the classic King’s College Criteria for non-paracetamol acute liver failure.
Open toolKing's College Criteria – Paracetamol
Open toolLille Score
Estimates corticosteroid response in severe alcohol-associated hepatitis.
Open toolMaddrey Discriminant Function
Calculates Maddrey discriminant function in alcohol-associated hepatitis.
Open toolMELD Score
Calculates the original MELD score from bilirubin, INR and creatinine.
Open toolMELD-Na Score
Calculates the established MELD-Na score from bilirubin, INR, creatinine, sodium and recent dialysis status.
Open toolNAFLD Fibrosis Score
Calculates the NAFLD Fibrosis Score from age, BMI, glucose status, AST/ALT ratio, platelets and albumin.
Open toolInfectious Diseases
1 toolsNeurology
6 toolsABCD² Score
Estimates early stroke risk after a suspected transient ischaemic attack using age, blood pressure, clinical features, symptom duration and diabetes.
Open toolAdult Glasgow Coma Scale Reference
Provides a concise adult Glasgow Coma Scale reference.
Open toolHunt & Hess Scale
Grades clinical severity after aneurysmal subarachnoid haemorrhage.
Open toolICH Score
Estimates mortality risk after spontaneous intracerebral haemorrhage using five admission variables.
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 toolNutrition
1 toolsObstetrics & Gynaecology
3 toolsOncology
3 toolsECOG Performance Status
Classifies functional status from grade 0 to 5 using the ECOG performance scale.
Open toolKarnofsky Performance Status
Classifies functional performance from 100 to 0 using the Karnofsky Performance Status scale.
Open toolModified Glasgow Prognostic Score
Calculates the modified Glasgow Prognostic Score from CRP and albumin.
Open toolOrthopaedics
1 toolsPaediatrics
8 tools4-2-1 Hourly Maintenance Fluids
Calculates traditional hourly paediatric maintenance fluid rate.
Open toolBedside Schwartz eGFR
Estimates paediatric eGFR using the bedside Schwartz equation.
Open toolHolliday-Segar Daily Maintenance Fluids
Calculates traditional daily paediatric maintenance fluid volume.
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 toolWestley Croup Score
Calculates clinical croup severity using the Westley score.
Open toolPalliative Care
1 toolsRenal / General Medicine
1 toolsRenal Medicine
12 toolsAKIN Classification
Stages AKI using AKIN criteria.
Open toolBUN to Creatinine Ratio
Calculates the blood urea nitrogen to creatinine ratio.
Open tooleGFR (CKD-EPI 2021)
Calculates estimated glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation and automatically classifies chronic kidney disease (CKD) stage.
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 toolFree Water Deficit
Estimates free water deficit in hypernatraemia.
Open toolKDIGO Acute Kidney Injury Stage
Stages acute kidney injury using KDIGO serum creatinine and urine-output criteria.
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 criteria.
Open toolSodium Deficit
Estimates sodium deficit from total body water and current and target sodium.
Open toolTranstubular Potassium Gradient
Calculates the transtubular potassium gradient.
Open toolUrea Reduction Ratio
Calculates haemodialysis urea reduction ratio from pre- and post-dialysis measurements.
Open toolRespiratory Medicine
15 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-Arterial Oxygen Gradient
Calculates the alveolar-arterial oxygen gradient.
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 toolCURB-65 Score
Assesses mortality risk in adults with community-acquired pneumonia.
Open toolCURSI Score
Calculates CURSI pneumonia severity criteria.
Open toolDECAF Score
Records and interprets a completed DECAF score.
Open toolEpworth Sleepiness Scale
Measures self-reported daytime sleepiness across eight situations.
Open toolPneumonia Severity Index (PSI/PORT)
Calculates the PSI/PORT score and risk class for adults with community-acquired pneumonia.
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.
Open toolSurgery
4 toolsAlvarado Score
Estimates the likelihood of acute appendicitis using symptoms, signs and laboratory findings.
Open toolAppendicitis Inflammatory Response Score
Estimates appendicitis probability using symptoms, examination findings and inflammatory markers.
Open toolCaprini VTE Risk Score
Calculates the 2013 Caprini venous thromboembolism risk score for surgical patients.
Open toolFournier's Gangrene Severity Index
Calculates the Fournier's Gangrene Severity Index from nine physiological and laboratory variables.
Open toolA
21 toolsABCD² Score
Estimates early stroke risk after a suspected transient ischaemic attack using age, blood pressure, clinical features, symptom duration and diabetes.
Open toolAbsolute Eosinophil Count
Calculates absolute eosinophil count.
Open toolAbsolute Neutrophil Count
Calculates absolute neutrophil count.
Open toolAdrenaline Anaphylaxis Dose Calculator
Calculates a protocol-selected intramuscular adrenaline dose for anaphylaxis.
Open toolAdult Arterial Blood Gas Reference
Provides commonly used adult arterial blood gas reference values.
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 Ventilator Reference Values
Provides concise adult invasive ventilation reference concepts.
Open toolAIMS65 Score
Estimates inpatient mortality risk in acute upper gastrointestinal bleeding using five variables.
Open toolAKIN Classification
Stages AKI using AKIN criteria.
Open toolALBI Score
Calculates the albumin-bilirubin score.
Open toolAlvarado Score
Estimates the likelihood of acute appendicitis using symptoms, signs and laboratory findings.
Open toolAlveolar-Arterial Oxygen Gradient
Calculates the alveolar-arterial oxygen gradient.
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 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 toolAppendicitis Inflammatory Response Score
Estimates appendicitis probability using symptoms, examination findings and inflammatory markers.
Open toolAST to Platelet Ratio Index
Calculates APRI from AST, AST upper limit and platelet count.
Open toolATRIA Bleeding Score
Estimates haemorrhage risk in adults with atrial fibrillation receiving anticoagulation.
Open toolB
11 toolsBedside Schwartz eGFR
Estimates paediatric eGFR using the bedside Schwartz equation.
Open toolBicarbonate Deficit
Estimates bicarbonate deficit.
Open toolBISAP Score
Calculates the Bedside Index for Severity in Acute Pancreatitis.
Open toolBishop Score
Calculates cervical favourability before induction of labour.
Open toolBMI
Body Mass Index calculator.
Open toolBODE Index
Calculates the multidimensional BODE index for prognosis in stable COPD.
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 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
26 toolsCalculated Serum Osmolality
Calculates estimated serum osmolality from sodium, glucose and BUN.
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 following emergency department assessment of syncope.
Open toolCaprini VTE Risk Score
Calculates the 2013 Caprini venous thromboembolism risk score for surgical patients.
Open toolCardiac Index
Calculates cardiac index from cardiac output and body surface area.
Open toolCardiac Power Output
Calculates cardiac power output from mean arterial pressure and cardiac output.
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 toolCHA2DS2 VASc
Estimates stroke risk factors in atrial fibrillation using the CHA₂DS₂-VASc score.
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 toolClinical Frailty Scale
Classifies baseline fitness and frailty from 1 to 9 using the Clinical Frailty Scale.
Open toolcm ↔ ft/in Converter
Converts height between centimetres and feet/inches.
Open toolCockcroft Gault
Estimates creatinine clearance using the Cockcroft–Gault formula.
Open toolCommon Electrolyte Reference Values
Provides illustrative adult reference intervals for common electrolytes.
Open toolConfusion Assessment Method (CAM)
Applies the four-feature Confusion Assessment Method algorithm for delirium screening.
Open toolCOPD Assessment Test (CAT)
Calculates the eight-item COPD Assessment Test symptom-impact score.
Open toolCorrected Calcium
Corrects serum calcium for albumin concentration.
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 toolCRB-65 Score
Assesses community-acquired pneumonia severity without requiring a blood urea result.
Open toolCURB-65 Score
Assesses mortality risk in adults with community-acquired pneumonia.
Open toolCURSI Score
Calculates CURSI pneumonia severity criteria.
Open toolD
5 toolsDAPT Score
Estimates the balance of ischaemic benefit and bleeding harm from extending dual antiplatelet therapy beyond 12 months after PCI.
Open toolDe Ritis Ratio
Calculates the AST to ALT ratio.
Open toolDECAF Score
Records and interprets a completed DECAF score.
Open toolDelta Ratio
Calculates the delta ratio in high-anion-gap metabolic acidosis.
Open toolDuke Treadmill Score
Calculates the Duke Treadmill Score from exercise duration, ST deviation and exercise angina.
Open toolE
6 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 tooleGFR (CKD-EPI 2021)
Calculates estimated glomerular filtration rate (eGFR) using the 2021 CKD-EPI creatinine equation and automatically classifies chronic kidney disease (CKD) stage.
Open toolEnoxaparin Dose Calculator
Calculates a clinician-selected weight-based enoxaparin dose.
Open toolEpworth Sleepiness Scale
Measures self-reported daytime sleepiness across eight situations.
Open toolEstimated Due Date
Estimates expected date of delivery from the last menstrual period.
Open toolF
9 toolsFIB-4 Index
Calculates the FIB-4 index from age, AST, ALT and platelets.
Open toolFlucloxacillin Dose Calculator
Calculates a clinician-selected flucloxacillin dose calculator dose.
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 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 toolFree Water Deficit
Estimates free water deficit in hypernatraemia.
Open toolFull Rockall Score
Calculates the full Rockall score for upper gastrointestinal bleeding using clinical and endoscopic findings.
Open toolG
6 toolsGentamicin Dose Calculator
Calculates a protocol-selected weight-based gentamicin dose.
Open toolGlasgow Alcoholic Hepatitis Score
Records and interprets a completed Glasgow Alcoholic Hepatitis Score.
Open toolGlasgow Coma Scale
Assesses level of consciousness using the best observed eye, verbal and motor responses.
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 toolGRACE ACS Risk Score
Calculates a bedside GRACE acute coronary syndrome risk score using the established point-based variables.
Open toolH
8 toolsHAS-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 presenting with suspected acute coronary syndrome using history, ECG, age, risk factors and troponin.
Open toolHestia Criteria
Identifies exclusion criteria for outpatient treatment of confirmed acute pulmonary embolism.
Open toolHolliday-Segar Daily Maintenance Fluids
Calculates traditional daily paediatric maintenance fluid volume.
Open toolHOMA-IR Calculator
Calculates HOMA-IR from fasting glucose and fasting insulin.
Open toolHunt & Hess Scale
Grades clinical severity after aneurysmal subarachnoid haemorrhage.
Open toolH₂FPEF Score
Calculates the H₂FPEF score for unexplained dyspnoea and suspected HFpEF.
Open toolI
6 toolsIbuprofen 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 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 toolISTH Overt DIC Score
Records and interprets a completed ISTH overt DIC score.
Open toolK
5 toolsKarnofsky Performance Status
Classifies functional performance from 100 to 0 using the Karnofsky Performance Status scale.
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 toolKing's College Criteria – Non-Paracetamol
Applies the classic King’s College Criteria for non-paracetamol acute liver failure.
Open toolKing's College Criteria – Paracetamol
Open toolL
4 toolsLactate Clearance Calculator
Calculates percentage lactate clearance between an initial and repeat measurement.
Open toolLEFt Rule for DVT in Pregnancy
Records LEFt clinical features associated with DVT in pregnancy.
Open toolLille Score
Estimates corticosteroid response in severe alcohol-associated hepatitis.
Open toolLRINEC Score
Calculates the Laboratory Risk Indicator for Necrotising Fasciitis from six laboratory measurements.
Open toolM
21 toolsMaddrey Discriminant Function
Calculates Maddrey discriminant function 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 toolMean Arterial Pressure (MAP)
Calculates estimated mean arterial pressure from systolic and diastolic blood pressure.
Open toolMELD Score
Calculates the original MELD score from bilirubin, INR and creatinine.
Open toolMELD-Na Score
Calculates the established MELD-Na score from bilirubin, INR, creatinine, sodium and recent dialysis status.
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 toolMini Nutritional Assessment – Short Form (MNA-SF)
Screens older adults for malnutrition using the six-item MNA Short Form.
Open toolMirels Score
Estimates pathological fracture risk in long-bone metastases using the Mirels score.
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 Early Warning Score (MEWS)
Calculates a Modified Early Warning Score from systolic blood pressure, heart rate, respiratory rate, temperature and consciousness.
Open toolModified Glasgow Prognostic Score
Calculates the modified Glasgow Prognostic Score from CRP and albumin.
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 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 toolN
11 toolsNAFLD Fibrosis Score
Calculates the NAFLD Fibrosis Score from age, BMI, glucose status, AST/ALT ratio, platelets and albumin.
Open toolNational Early Warning Score 2
Assesses acute illness severity and risk of clinical deterioration.
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
Applies the NEXUS Chest criteria in blunt trauma.
Open toolNIH Stroke Scale (NIHSS)
Quantifies neurological impairment in suspected or confirmed acute stroke using the 15 scored NIHSS items.
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 toolNUTRIC Score
Records and interprets a completed Nutrition Risk in the Critically Ill score.
Open toolO
6 toolsOakland Score
Records and interprets a completed Oakland Score for acute lower gastrointestinal bleeding.
Open toolORBIT Bleeding Score
Estimates major bleeding risk in adults with atrial fibrillation receiving oral anticoagulation.
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 toolOxygenation Index
Calculates oxygenation index from FiO₂, mean airway pressure and PaO₂.
Open toolP
16 toolsPadua Prediction Score
Assesses venous thromboembolism risk in hospitalised medical patients.
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 toolPalliative Performance Scale
Records the Palliative Performance Scale using standard 10% categories.
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 toolPERC Rule
Pulmonary Embolism Rule-out Criteria for identifying adults with a clinician-assessed low pretest probability of pulmonary embolism who meet all eight negative PERC criteria.
Open toolPiperacillin/Tazobactam Dose Calculator
Calculates a clinician-selected piperacillin/tazobactam dose calculator dose.
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 toolPneumonia Severity Index (PSI/PORT)
Calculates the PSI/PORT score and risk class for adults with community-acquired pneumonia.
Open toolPRECISE-DAPT Score
Estimates out-of-hospital bleeding risk during dual antiplatelet therapy after PCI.
Open toolPulmonary Embolism Severity Index (PESI)
Risk-stratifies patients with acute pulmonary embolism using the original Pulmonary Embolism Severity Index.
Open toolPulse Pressure
Calculates pulse pressure from systolic and diastolic blood pressure.
Open toolQ
1 toolsR
8 toolsRanson's Criteria
Calculates Ranson criteria for acute pancreatitis severity.
Open toolRate Pressure Product
Calculates rate-pressure product from heart rate and systolic blood pressure.
Open toolReticulocyte Production Index
Calculates a reticulocyte production index.
Open toolRevised Geneva Score
Estimates pre-test probability of pulmonary embolism using objective clinical variables.
Open toolRevised Trauma Score
Calculates the triage 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 criteria.
Open toolROX Index
Calculates the ROX Index from oxygen saturation, inspired oxygen fraction and respiratory rate.
Open toolS
12 toolsSan Francisco Syncope Rule
Screens for short-term serious outcome risk after syncope using 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 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 toolSIRS Criteria
Counts systemic inflammatory response syndrome criteria from temperature, pulse, respiration and white-cell findings.
Open toolSMART-COP Score
Records and interprets a completed SMART-COP score.
Open toolSodium Deficit
Estimates sodium deficit from total body water and current and target sodium.
Open toolSOFA Score
Assess dysfunction across six organ systems using the Sequential Organ Failure Assessment score.
Open toolSokolow-Lyon Index
Calculates the Sokolow-Lyon ECG voltage criterion for left ventricular hypertrophy.
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.
Open toolT
4 toolsTIMI 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 toolTranstubular Potassium Gradient
Calculates the transtubular potassium gradient.
Open toolU
1 toolsV
3 toolsW
4 toolsWaterlow Score
Assesses pressure-ulcer risk using the Waterlow risk-assessment domains.
Open toolWells Score for Pulmonary Embolism
Estimates the clinical probability of pulmonary embolism.
Open toolWells-Score DVT
Estimates the clinical probability of deep vein thrombosis.
Open toolWestley Croup Score
Calculates clinical croup severity using the Westley score.
Open toolY
1 tools#
5 tools4-2-1 Hourly Maintenance Fluids
Calculates traditional hourly paediatric maintenance fluid rate.
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 HIT
Calculates the 4Ts score for heparin-induced thrombocytopenia.
Open toolµmol/L ↔ mg/dL Converter
Converts selected laboratory analytes between µmol/L and mg/dL.
Open tool