Lean Body Mass Calculator
Lean body mass is everything in your body except fat. That includes muscle, bone, organs and water. This calculator estimates it from your sex, weight and height.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
The Boer formula estimates lean mass in kilograms from weight in kilograms and height in centimeters. Men and women use different coefficients, so the sex setting changes the answer.
Body fat is not part of this formula. The result is an estimate for a typical adult of your size, not a measure of your actual muscle or bone.
Worked example
At 160 lb and 68 in tall, the estimated lean body mass is 124.5 lb.
Questions
Is lean body mass the same as muscle?
No. It also counts bone, organs and water. Muscle is only one part of it.
What is lean mass used for?
Some fitness plans use it to set protein goals. A dietitian or trainer can build a plan from your own measurements.
Why do the formulas differ for men and women?
On average, men carry more lean mass at the same height and weight, so the two formulas use different numbers.
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