Lean Body Mass Calculator

Estimate lean body mass from the measurements entered, helping separate estimated non-fat mass from total body weight.

Lean Body Mass Calculator

Lean body mass (LBM) is an estimate of body weight excluding body fat. The Lean Body Mass Calculator uses your entered measurements and a standard estimation formula to calculate an approximate lean mass value.

How lean mass is estimated

Different LBM equations use combinations of height, weight, age, sex, or other measurements. Because formulas vary, the exact result depends on the method implemented by the calculator.

Using the calculator

Enter the requested measurements in the displayed units and check each value before calculating. Keep units consistent if you are comparing results over time.

Understanding the result

Lean body mass is not identical to skeletal muscle mass. It includes tissues and body components other than stored body fat, so the result should not be interpreted as a direct measurement of muscle.

Frequently Asked Questions FAQ

What is lean body mass?
Lean body mass is an estimate of body weight excluding body fat.
Is lean body mass the same as muscle mass?
No. Lean body mass includes more than skeletal muscle, so the two terms should not be treated as identical.
How is lean body mass estimated?
LBM can be estimated with equations using measurements such as height, weight, age, and sex, depending on the selected formula.
Can lean body mass change over time?
Yes. Changes in body weight and body composition can change estimated lean body mass.

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