Lean Body Mass Calculator
Lean body mass is the weight of everything in your body except fat — muscles, bones, water and organs. Estimate it three ways: from your body fat percentage, or with the Boer, James and Hume formulas that use height, weight and sex.
Enter your details above and the result will appear here.
How to use
- Enter your weight, height and sex.
- Optionally enter a body fat percentage for the direct figure.
- All lean mass estimates appear instantly.
Note
Boer, James and Hume are published regression formulas using weight, height and sex. The body-fat method (weight x (1 - body fat)) is only as good as the body fat measurement behind it. Estimate only — not medical advice.