Body Composition Calculators
Body composition is a fuller picture than weight alone: it answers how much of you is fat, how much is lean tissue, and where the fat sits. These calculators cover the standard measures used in clinics and gyms — BMI, body fat percentage from tape measurements, lean body mass, ideal weight and waist-to-hip ratio — plus the variants (metric, imperial, women, kids) that different guidance uses. Every tool runs in your browser and none of your measurements leave your device.
BMI Calculator
Body mass index with category and healthy weight range
BMI Calculator (Metric)
Centimetres and kilograms
BMI Calculator (Imperial)
Feet, inches and pounds
BMI for Women
With female body-composition context
BMI for Kids & Teens
Why age percentiles replace adult bands
BMI Chart
Healthy weight range by height
Body Fat Calculator
US Navy tape method with fat and lean mass
Body Fat Percentage Calculator
Compare against healthy ranges
Army Body Fat Calculator
US Army circumference method
Navy Body Fat Calculator
Exact Navy measurement sites
Lean Body Mass Calculator
Lean mass and fat mass from body fat %
Ideal Weight Calculator
Devine, Robinson, Miller and Hamwi formulas
Waist-to-Hip Ratio Calculator
WHO thresholds for fat distribution
Body Recomposition Calculator
Lose fat while holding muscle