Free Medical Calculators for Physicians
150 validated clinical calculators across 23 calculator categories, built for clinicians working across 34 specialties and 200+ mapped subspecialties. Each implements the published formula from its original reference paper. Free to use, no signup required.
Get AI-Powered Clinical InsightsSurgery(20)
Caprini VTE Risk Score
Venous thromboembolism risk assessment for surgical patients
Parkland Formula
Fluid resuscitation calculation for burn patients
Clavien-Dindo Classification
Surgical complication grading system (Grade I-V)
Modified Baux Score
Burn mortality prediction (age + %TBSA + inhalation injury)
Rutherford Classification
Chronic limb ischemia severity classification (Category 0-6)
Fontaine Staging
Peripheral arterial disease staging (Stage I-IV)
Glasgow Aneurysm Score
AAA repair mortality prediction
Surgical Apgar Score
Intraoperative risk from EBL, lowest HR, lowest MAP (0-10)
Harris Hip Score
Hip arthroplasty outcome assessment (0-100)
WOMAC Osteoarthritis Index
Osteoarthritis severity for hip/knee (pain/stiffness/function)
Lysholm Knee Score
Knee ligament injury functional outcome (0-100)
Wallace Rule of Nines (TBSA)
Total body surface area estimation for burn patients using anatomical region percentages
Abbreviated Burn Severity Index (ABSI)
Burn mortality prediction from sex, age, TBSA, inhalation, full-thickness
P-POSSUM
Perioperative mortality and morbidity prediction (Portsmouth POSSUM)
Hardman Index
Ruptured AAA mortality prediction (5 yes/no criteria)
QuickDASH
Upper extremity disability assessment (11 items, score 0-100)
Ankle-Brachial Index (ABI)
Peripheral arterial disease diagnostic interpretation
Oxford Knee Score
Knee replacement patient-reported outcome measure
Oxford Hip Score
Hip replacement patient-reported outcome measure
EuroSCORE II
Cardiac surgery operative mortality prediction
Cardiovascular(17)
CHA₂DS₂-VASc Score
Stroke risk stratification in atrial fibrillation
HAS-BLED Score
Major bleeding risk for patients on anticoagulation
HEART Score
Risk stratification for chest pain patients in the ED
TIMI Score (UA/NSTEMI)
Risk stratification for unstable angina/NSTEMI
TIMI Score (STEMI)
30-day mortality risk for STEMI
GRACE Score
ACS mortality prediction
ASCVD 10-Year Risk
Pooled Cohort Equations for CV risk
QTc Correction
Heart rate-corrected QT interval
Framingham Risk Score
10-year coronary heart disease risk
Sgarbossa Criteria
MI diagnosis in LBBB/paced rhythm
Mean Arterial Pressure (MAP)
Mean arterial pressure from systolic and diastolic blood pressure
Revised Cardiac Risk Index (RCRI/Lee)
Preoperative cardiac risk for non-cardiac surgery
Tisdale Risk Score for QT Prolongation
Drug-induced QT prolongation risk in hospitalized patients
NYHA Functional Classification
Heart failure functional classification
Killip Classification
Heart failure classification in acute MI
Duke Criteria for Endocarditis
Infective endocarditis diagnostic criteria
ORBIT Bleeding Risk Score
Bleeding risk for AF patients on oral anticoagulation
Pulmonary(13)
Wells Criteria for PE
Pre-test probability of pulmonary embolism
Pulmonary Embolism Severity Index (PESI)
30-day mortality risk stratification for acute pulmonary embolism
Simplified PESI (sPESI)
Simplified 6-point PE severity index for identifying low-risk patients
CURB-65 Score
Pneumonia severity and disposition
PERC Rule
PE rule-out criteria for low-risk patients
A-a Gradient
Alveolar-arterial oxygen gradient
Light's Criteria
Pleural effusion classification — transudative vs exudative
PSI/PORT Score (Pneumonia Severity Index)
Pneumonia severity and admission decision
CRB-65 Score
Community pneumonia severity for GP/primary care (no BUN required)
YEARS Algorithm
Simplified PE exclusion with adjusted D-dimer thresholds
mMRC Dyspnea Scale
Modified Medical Research Council dyspnea grading for COPD
Epworth Sleepiness Scale
Excessive daytime sleepiness assessment
GOLD COPD Classification
COPD severity staging by spirometry
Critical Care(11)
qSOFA Score
Quick sepsis screening outside ICU
Glasgow Coma Scale
Level of consciousness assessment
SOFA Score
Sequential Organ Failure Assessment
NEWS2 Score
National Early Warning Score for deterioration
APACHE II Score
ICU mortality prediction using acute physiology and chronic health evaluation
Predicted Body Weight (ARDSNet)
Predicted body weight for lung-protective ventilation tidal volume
Richmond Agitation-Sedation Scale (RASS)
ICU sedation-agitation level assessment (-5 to +4)
CIWA-Ar (Alcohol Withdrawal)
Alcohol withdrawal severity assessment guiding benzodiazepine dosing
4AT Delirium Score
Rapid delirium screening tool
Padua Prediction Score
VTE risk assessment for hospitalized medical patients
CAM-ICU
Confusion Assessment Method for ICU delirium screening
Emergency Medicine(10)
Ottawa Ankle Rule
Ankle/foot X-ray decision rule
Ottawa Knee Rule
Knee X-ray decision rule
Canadian C-Spine Rule
Cervical spine imaging decision rule
NEXUS Criteria
Cervical spine clearance criteria
SIRS Criteria
Systemic inflammatory response syndrome
Canadian Syncope Risk Score
Syncope 30-day serious adverse event risk and disposition
Injury Severity Score (ISS)
Trauma severity scoring using Abbreviated Injury Scale
Alvarado Score (MANTRELS)
Appendicitis likelihood scoring for right iliac fossa pain
Revised Trauma Score (RTS)
Trauma triage and outcome prediction
Canadian CT Head Rule
CT decision rule for adult minor head injury
Psychiatry(9)
PHQ-9 (Patient Health Questionnaire-9)
Depression screening and severity assessment
GAD-7 (Generalized Anxiety Disorder-7)
Anxiety screening and severity assessment
AUDIT-C
Alcohol use disorder screening
MDQ (Mood Disorder Questionnaire)
Bipolar disorder screening
C-SSRS (Columbia Suicide Severity Rating Scale)
Suicide risk assessment
MMSE (Mini-Mental State Examination)
Cognitive impairment screening
CAGE Questionnaire
Alcohol use disorder screening (4 yes/no questions)
DAST-10
Drug Abuse Screening Test
PCL-5 (PTSD Checklist)
PTSD screening and symptom severity assessment
General(7)
Body Mass Index
Weight classification based on height and weight
Body Surface Area
Body surface area calculation (Mosteller)
Ideal Body Weight
Ideal body weight (Devine formula)
LDL Cholesterol (Friedewald)
Calculated LDL when TG < 400
Estimated Average Glucose
Convert HbA1c to average glucose
ASA Physical Status Classification
Preoperative physical status assessment
Charlson Comorbidity Index
Comorbidity burden and 10-year mortality prediction
Neurology(7)
ABCD² Score
Stroke risk after TIA
NIH Stroke Scale
Stroke severity assessment
Hunt & Hess Classification
Subarachnoid hemorrhage clinical grading
ICH Score
Intracerebral hemorrhage 30-day mortality prediction
Modified Rankin Scale (mRS)
Functional disability after stroke/neurosurgery (0-6)
ASIA Impairment Scale (AIS)
Spinal cord injury classification (A-E)
Hoehn & Yahr Staging
Parkinson's disease staging
Pediatrics(7)
PECARN Pediatric Head CT Rule
Pediatric head CT decision for minor trauma
Apgar Score
Newborn assessment at birth
Pediatric Glasgow Coma Scale
Level of consciousness for children
Schwartz Equation (Pediatric eGFR)
Estimated GFR for children using height and creatinine
APLS Weight Estimation
Emergency pediatric weight estimation from age (AU/NZ/UK formulas)
Pediatric Early Warning Score (PEWS)
Pediatric clinical deterioration detection on wards
Broselow Pediatric Weight Estimation
Weight estimation from body length for pediatric emergencies
Gastroenterology(6)
Ranson Criteria
Pancreatitis severity and mortality
Glasgow-Blatchford Bleeding Score
Upper GI bleed risk stratification and need for intervention
Rockall Score
Upper GI bleed mortality and rebleed risk prediction
AIMS65 Score
Upper GI bleed in-hospital mortality prediction (bedside)
Forrest Classification
Endoscopic classification of peptic ulcer bleeding
BISAP Score
Bedside Index for Severity in Acute Pancreatitis
Renal(5)
eGFR (CKD-EPI 2021)
Estimated glomerular filtration rate using CKD-EPI 2021 equation (race-free)
Creatinine Clearance (Cockcroft-Gault)
Estimated creatinine clearance for drug dosing
Fractional Excretion of Sodium
Differentiates prerenal vs intrinsic renal AKI
Free Water Deficit
Free water deficit in hypernatremia
KDIGO AKI Staging
Acute kidney injury staging
Electrolytes(5)
Corrected Calcium
Calcium correction for hypoalbuminemia
Anion Gap
Unmeasured anions for metabolic acidosis workup
Sodium Correction for Hyperglycemia
True sodium in DKA/HHS
Calculated Serum Osmolality
Estimated serum osmolality and osmolar gap
Winter's Formula
Expected pCO₂ in metabolic acidosis for mixed acid-base disorder detection
Obstetrics(5)
Bishop Score
Cervical favorability for labor induction
Gestational Age Calculator
Calculate gestational age and EDD from LMP
VBAC Success Predictor
Vaginal birth after cesarean success probability
Robson Classification
WHO-recommended cesarean section indication grouping (Groups 1-10)
Edinburgh Postnatal Depression Scale
Postnatal depression screening
Hepatology(4)
Hematology(3)
Rheumatology(3)
Drug Dosing(3)
Anesthesiology(3)
Urology(3)
Endocrinology(3)
Infectious Disease(2)
Oncology(2)
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