Sex, Weight, Height
Lean Body Mass Calculator
Estimate how much of your weight is lean tissue rather than fat.
Waiting for input
How this calculator works
Lean body mass is everything in the body except fat: muscle, bone, organs and water. It is used for dosing some medicines and for setting protein targets. The Boer and Hume equations estimate it from height and weight alone, so they describe an average build and will underestimate very muscular people.
Formula
- Boer (men): 0.407 × kg + 0.267 × cm − 19.2
- Boer (women): 0.252 × kg + 0.473 × cm − 48.3
- Hume (men): 0.32810 × kg + 0.33929 × cm − 29.5336
- Hume (women): 0.29569 × kg + 0.41813 × cm − 43.2933
Worked example
Man, 80 kg, 180 cm
- Sex
- Male
- Weight
- 80 kg
- Height
- 180 cm
Result61.4 kg (135.4 lb)
Estimated lean body mass (Boer), about 77% of body weight.
Things to keep in mind
- Estimates from height and weight cannot see your actual muscle. A DEXA scan or a tape-measure body fat method is more specific.
- For general information only. It is not medical advice; talk to a health professional about your own situation.
Frequently asked questions
What is the difference between lean body mass and muscle mass?
Lean body mass includes muscle plus bone, organs, skin and body water. Skeletal muscle is only part of it, typically 40-50%.
What is a normal lean body mass percentage?
Roughly 75-85% of body weight for men and 68-80% for women, which corresponds to typical body fat ranges.
How is lean body mass used?
For dosing certain drugs and anesthetics, estimating energy needs, and setting protein intake targets.
More in Health & Fitness
Results are estimates based on the values you enter and the published method shown above. They do not replace professional medical, financial or legal advice. Method reviewed October 7, 2026. About this site