Fitness

Lean Body Mass Calculator

Calculate your lean body mass (LBM) — the weight of everything except fat — using multiple validated formulas.

Input Parameters

Results

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Lean Body Mass

Boer Formula—

James Formula—

Hume Formula—

Body Fat Mass—

About Lean Body Mass

Lean Body Mass (LBM) includes muscles, bones, organs, blood, skin, and water — everything except fat. It's important for calculating accurate drug dosages, protein needs, and calorie requirements. Athletes typically have higher LBM than the general population.