Free clinical calculators and scores for physicians and medical students · Browse all calculators
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Clinical calculators and scores

Validated clinical scores and formulas with automatic interpretation. Every tool includes the source publication, when to use it, its limitations and a worked clinical example. Open access, no registration.

65
calculators available
13
specialties
Free
no registration
Sourced
original publications

Cardiology

13
ARC-HBR High bleeding risk (HBR) assessment for PCI and antithrombotic therapy CHA₂DS₂-VASc Stroke risk assessment in atrial fibrillation HAS-BLED Estimates annual major bleeding risk on anticoagulation for atrial fibrillation Heart Rate from R-R Interval Calculate heart rate from R-R interval duration Killip Classification Assessment of heart failure severity in acute myocardial infarction NYHA Functional Class Classification of chronic heart failure severity ORACUL Russian-derived score for bleeding risk in acute coronary syndrome PRECISE-DAPT Bleeding risk score for choosing DAPT duration after PCI PREVENT — 10-Year ASCVD Risk 10-year risk of atherosclerotic cardiovascular disease (AHA PREVENT 2024) QRS Axis (Electrical Axis of the Heart) Determines the QRS axis from amplitudes in leads I and aVF QTc — Corrected QT Corrected QT interval by 4 formulas: Bazett, Fridericia, Framingham, Hodges Sgarbossa Criteria Diagnosing AMI in the presence of left bundle branch block (LBBB) Tisdale Risk Score for QT Prolongation Predicts risk of QT prolongation in hospitalized patients

Emergency and Critical Care

13
Dobutamine Infusion Calculatorformula Converts dobutamine dose (mcg/kg/min) to infusion rate (mL/h) for cardiogenic shock. Dopamine Infusion Calculatorformula Converts dopamine dose (µg/kg/min) to infusion rate (mL/h) with dose-based interpretation. Epinephrine Infusion Calculatorformula Calculates epinephrine infusion rate (mcg/kg/min → mL/h). Not for bolus dosing. Geneva Score (PE) Clinical probability of PE (Revised Geneva Score) HEART Score Risk stratification for chest pain in the emergency department Infusion Rate Calculatorformula Calculate infusion rate in mL/h, drops/min, and drip interval with a visual metronome. Norepinephrine Infusion Calculatorformula Converts norepinephrine dose in µg/kg/min to infusion rate in mL/hour. Phenylephrine Infusion Calculatorformula Converts phenylephrine dose (mcg/kg/min) to infusion rate (mL/hr) for hypotension. Propofol Calculator (Sedation)formula Calculates propofol infusion rate (mL/h) from dose and emulsion concentration (1% or 2%). qSOFA Quick bedside sepsis risk screening tool Shock Index HR / SBP ratio for rapid hemodynamic assessment SOFA Assessment of multiorgan dysfunction (sepsis, ICU) Wells Score (PE) Assesses clinical probability of pulmonary embolism

Hepatology

10
APRI (AST to Platelet Ratio Index) Noninvasive assessment of liver fibrosis Child-Pugh Score Assesses cirrhosis severity and prognosis FIB-4 Liver fibrosis index based on age, AST, ALT, and platelet count GAHS (Glasgow Alcoholic Hepatitis Score) Prognosis of alcoholic hepatitis and selection for steroid therapy Knodell Fibrosis Score (Ishak simplified: 0–4) Fibrosis stage in the Knodell index / Ishak stage Lille Model for Alcoholic Hepatitis Predicts response to corticosteroid therapy by day 7; cutoff 0.45 Maddrey Discriminant Function (Maddrey Score) Severity of alcoholic hepatitis; DF ≥ 32 typically indicates corticosteroids MELD Score Model for End-Stage Liver Disease score for cirrhosis severity and transplant priority METAVIR Fibrosis Score Histologic stage of liver fibrosis (biopsy) Rockall Score (pre-endoscopic) Risk stratification for upper GI bleeding before endoscopy

Oncology

5
CIRS-G (Cumulative Illness Rating Scale for Geriatrics) Cumulative severity across 14 organ systems (0-4 each) CLL-IPI (International Prognostic Index for CLL) Risk stratification in chronic lymphocytic leukemia ECOG / WHO Performance Status Scale for assessing the functional status of oncology patients FIGO/WHO 2000 Prognostic Score for Gestational Trophoblastic Neoplasia (GTN) Low vs high risk stratification for gestational trophoblastic neoplasia (GTN) Karnofsky Performance Status (KPS) Percentage-based assessment of functional status and ability to work

Neurology

4
4AT Rapid bedside delirium screening tool ABCD² Stroke risk assessment in the first 2-7 days after TIA Glasgow Coma Scale (GCS) Assessment of level of consciousness Modified Rankin Scale (mRS) Assessment of disability after stroke

Screening

4
AUDIT (Full WHO Questionnaire, 10 Questions) Screening for risky and harmful alcohol use AUDIT-C Screening for risky or harmful alcohol use Body Mass Index (BMI) Calculate BMI from height and weight with WHO classification CAGE (alcohol dependence screening) Four questions, each "yes" answer = 1 point

Internal Medicine

3
Centor Score (McIsaac) Estimates likelihood of group A streptococcal pharyngitis and need for antibiotics Charlson Comorbidity Index (CCI) Overall burden of comorbid disease and survival prognosis Padua Prediction Score VTE risk assessment for hospitalized non-surgical patients

Nephrology

3
eGFR (CKD-EPI 2021) and CKD Stage Estimates GFR and CKD stage (G1-G5) from serum creatinine, age, and sex eGFR by CKD-EPI (cystatin C, 2012) Calculates eGFR from serum cystatin C alone (adults) KDIGO Risk Matrix (GFR and Albuminuria) CKD progression risk category (G + A)

Obstetrics and Neonatology

3
Apgar Score Assessment of newborn condition at 1 and 5 minutes of life Bishop Score Assessment of cervical readiness for labor induction EFI — Endometriosis Fertility Index (simplified) Predicts spontaneous pregnancy after endometriosis surgery (Adamson-Pasta, simplified)

Pulmonology

3
CURB-65 Assesses severity of community-acquired pneumonia PESI (Pulmonary Embolism Severity Index) Risk stratification in confirmed PE (30-day mortality) sPESI (simplified PESI) Simplified 6-criterion risk stratification for PE without labs except SpO2

Surgery

2
Alvarado Score Estimates probability of acute appendicitis using clinical and lab findings ASA Physical Status Classification ASA Physical Status Classification system for perioperative risk assessment

Infectious Diseases

1
Bristol Stool Form Scale Classification of stool consistency (types 1–7)

Pediatrics

1
CDS (Clinical Dehydration Scale) Assessment of dehydration in children with gastroenteritis
This calculator is intended for healthcare professionals. Do not use it for self-diagnosis or self-treatment. Management decisions are made by the treating clinician based on the full clinical picture of the individual patient.
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