Free Medical Calculators — Trusted by Healthcare Professionals
Evidence-based clinical calculators with formulas, interpretations, and references.
BMI Calculator
Calculate Body Mass Index from weight and height.
GeneraleGFR Calculator (CKD-EPI)
Estimate glomerular filtration rate using the CKD-EPI equation.
RenalCreatinine Clearance (Cockcroft-Gault)
Estimate creatinine clearance using the Cockcroft-Gault formula.
RenalCorrected Calcium Calculator
Correct serum calcium for albumin level.
GeneralAnion Gap Calculator
Calculate serum anion gap from electrolytes.
GeneralMELD Score Calculator
Calculate Model for End-Stage Liver Disease score with sodium.
HepaticQTc Calculator
Calculate corrected QT interval using Bazett and Fridericia formulas.
CardiacIdeal Body Weight Calculator
Calculate ideal body weight using the Devine formula.
GeneralA-a Gradient Calculator
Calculate alveolar-arterial oxygen gradient.
PulmonaryASCVD Risk Calculator
Estimate 10-year atherosclerotic cardiovascular disease risk.
CardiacMean Arterial Pressure (MAP) Calculator
Calculate mean arterial pressure from systolic and diastolic BP.
CardiacWells Score for PE
Estimate probability of pulmonary embolism using Wells criteria.
EmergencyCHA₂DS₂-VASc Score
Assess stroke risk in patients with atrial fibrillation.
CardiacCURB-65 Score
Assess severity of community-acquired pneumonia.
EmergencyChild-Pugh Score
Classify severity of chronic liver disease and cirrhosis.
HepaticRevised Cardiac Risk Index (RCRI)
Estimate risk of major cardiac events after non-cardiac surgery.
CardiacSodium Correction for Hyperglycemia
Correct sodium for elevated glucose levels.
RenalMaintenance IV Fluid Rate (4-2-1 Rule)
Calculate maintenance IV fluid rate using the 4-2-1 rule.
GeneralAlveolar Gas Equation Calculator
Calculate alveolar partial pressure of oxygen (PAO₂).
PulmonaryFramingham Risk Score
Estimate 10-year cardiovascular disease risk.
Vascular