Body Composition Calculators
5 free body composition calculators in the Health & Fitness category. Each tool gives instant results and explains the formula so you can follow the calculation.
BMI Calculator
BMI = weight(kg) / height(m)^2
Open calculator โBody Fat Calculator
US Navy method using log10 of body circumferences and height
Open calculator โBody Surface Area Calculator
Du Bois: BSA = 0.007184 x weight^0.425 x height^0.725
Open calculator โFFMI Calculator
FFMI = lean mass(kg) / height(m)^2; normalised adds 6.1 x (1.8 - height_m)
Open calculator โLean Body Mass Calculator
Boer formula for lean body mass
Open calculator โAbout body composition calculations
This page groups the body composition tools within Health & Fitness. Pick a calculator above to enter your values and get an instant result, complete with the formula, a step-by-step breakdown and a worked example. All calculators are mobile-friendly, accessible and free.
What are body composition calculators used for?
These tools help you with body composition calculations in the health & fitness category, giving instant results with the formula and a worked example on each page.
Are they free and private?
Yes. They are free, require no sign-up, and run entirely in your browser so your inputs stay on your device.