Lean Body Mass Calculator

Calculate your lean body mass (fat-free mass) using multiple formulas.

Gender

Height

Weight

Formula

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Lean Body Mass

— kg

% of total body weight

Fat

Fat Mass

kg

Ratio

Body Fat %

100.0%

Formula Comparison

Documentation

Understanding Lean Body Mass

Lean Body Mass (LBM) is everything in your body except fat: muscles, bones, organs, and water. Higher LBM typically indicates better metabolic health and athletic performance.

Ideal LBM %

Men: 75-85% LBM. Women: 68-78% LBM. Athletes may have higher values.

Formula Notes

Boer: Most commonly used, good general accuracy
James: Alternative formula, may be better for some populations
Hume: Based on body water content studies

Disclaimer: These formulas provide estimates. For accurate body composition, consider DEXA scans or other professional methods.