All medical calculators
Search 201 free clinical and wellness tools with instant, private results. Each calculator includes plain-language guidance, formulas, and limitations for informed use.
All medical calculators
201 calculators
Adjusted Body Weight
Adjusted weight when actual BMI is elevated.
AdjBW for obesity dosing
BMI Prime
BMI relative to upper-normal reference (25).
BMI / 25
Basal Metabolic Rate (BMR)
Estimated resting daily energy expenditure.
Mifflin-St Jeor
Body Adiposity Index
Hip circumference–based adiposity index.
BAI
Body Fat Percentage
Body-fat estimate from circumference measurements.
US Navy method
Body Mass Index (BMI)
Screening index for weight status using height and weight.
BMI = weight / height²
Body Surface Area
Surface area estimate used in dosing and physiology.
Mosteller
Harris-Benedict BMR
Classic resting metabolic rate estimate.
Classic Harris-Benedict
Ideal Body Weight
Reference weight estimate based on height and sex.
Devine equation
Lean Body Mass Estimate
Estimated lean mass from height, weight, and sex.
Boer formula
Maintenance Calories
Quick maintenance calorie estimate from weight.
TDEE shortcut
Ponderal Index
Alternative to BMI in some populations.
PI = weight / height³
Target Weight for BMI
Weight needed to reach a target BMI.
Weight at target BMI
Total Daily Energy Expenditure
Estimated daily calories including activity.
TDEE = BMR × activity
Waist-to-Height Ratio
Central adiposity screening index.
WtHR = waist / height
Waist-to-Hip Ratio
Fat distribution pattern estimate.
WHR = waist / hip
Weekly Weight Change
Expected weekly weight change from daily calorie balance.
Calorie balance
CHA₂DS₂-VASc Score
Estimates stroke risk to guide anticoagulation discussions.
Stroke risk in atrial fibrillation
Cardiac Index
Cardiac output indexed to body surface area.
CI = CO/BSA
Cardiac Output (Fick)
Cardiac output from Fick principle.
CO = VO₂/(Ca−Cv)
Corrected QT (Bazett)
QT interval corrected for heart rate.
QTc
Corrected QT (Framingham)
Alternative QT correction formula.
QTc = QT + 0.154×(1−RR)
Corrected QT (Fridericia)
QT interval corrected with Fridericia.
QTc = QT / RR^(1/3)
E/e′ Ratio
Diastolic function estimate from echo indices.
E/e′