Body & Weight Calculators

Calculate your BMI from height and weight in feet/inches or centimetres. See your CDC weight category, BMI Prime, and the healthy weight range for your height.

Estimate your body fat percentage from tape measurements using the US Navy formula. See your fat mass, lean mass, and where you sit against ACE fitness categories.

See your ideal body weight by the Devine, Robinson, Miller, and Hamwi formulas, alongside the healthy BMI weight range clinicians actually use.

Divide your waist by your height to assess central body fat — the measure NICE recommends alongside BMI, using a single 0.5 threshold that works across sexes.

Divide your waist by your hips to see how your body stores fat. Uses the WHO cut-offs — 0.90 for men, 0.85 for women — and checks your waist against WHO thresholds too.

Estimate your lean body mass from height, weight and sex with the Boer formula, compared against James and Hume, plus your implied body fat percentage and fat mass.

Find your moderate and vigorous exercise heart rate from age and resting pulse. Uses the Tanaka max heart rate formula with the Karvonen or percent-of-max method, plus five training zones.