All calculators
One for every body and life stage — all free, all private.
Adult BMI Calculator
The standard WHO BMI calculation with healthy range and category.
→BMI for Women
BMI with female-specific ranges and body composition context.
→BMI for Men
BMI for adult men with muscle-mass notes and healthy range.
→Child & Teen BMI
Age- and sex-specific BMI percentile for kids and teens.
→Senior BMI
Adjusted healthy range for adults 65+.
→Asian BMI
WHO-aligned thresholds for Asian populations.
→Athlete BMI
BMI with muscle-mass context for athletic builds.
→Ideal Weight
Find your healthy weight with 5 evidence-based formulas.
→Healthy Weight Range
See your healthy weight range based on a target BMI.
→Body Fat Percentage
Estimate BF% from BMI, age, and sex (Deurenberg 1991).
→Waist-to-Hip Ratio
WHO cardiometabolic risk thresholds by sex.
→Waist-to-Height Ratio
Single 0.5 cutoff across populations (Ashwell & Hsieh).
→BMI Prime
BMI / 25 — quick relative-to-healthy comparison.
→Body Surface Area
Mosteller formula. Used in chemo dosing, cardiac index.
→BMR Calculator
Mifflin-St Jeor resting energy expenditure.
→TDEE Calculator
Total daily calories with activity factor (1.2–1.9).
→Macro Split
Convert calorie target to grams of protein/carbs/fat.
→Calorie Deficit
Plan a safe weight-loss deficit and timeline.
→Lean Body Mass
Estimate fat-free mass via the Boer equation.
→Ponderal Index
The cube-based alternative to BMI (Rohrer).
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