Body Fat & Weight Calculators
Measure and track your body composition. Calculate BMI, body fat percentage, basal metabolic rate, ideal weight range, and lean body mass using clinically validated formulas.
11 free calculators · no sign-up · instant results
Body Composition
BMI Calculator
Body Mass Index with weight category
Body Fat Calculator
Body fat % using the US Navy method
Waist-to-Hip Ratio Calculator
WHR, body shape, and cardiovascular health risk
BMR Calculator
Basal metabolic rate — Mifflin-St Jeor & Harris-Benedict
Lean Body Mass Calculator
Weight minus fat using Boer formula or body fat %
Body Surface Area Calculator
BSA in m² using 4 validated medical formulas
Army Body Fat Calculator
Military tape-test body fat and AR 600-9 pass limits
Weight Goals
Frequently asked questions
Is BMI or body fat percentage better?
BMI is a fast screening tool but does not distinguish muscle from fat. For a fuller picture, pair it with the Body Fat and Lean Body Mass calculators, especially if you are muscular.
What is BMR and why does it matter?
Basal metabolic rate is the calories your body burns at rest. It is the starting point for setting calorie targets — use the BMR Calculator, then TDEE for your daily total.