Lean Body Mass Calculator

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

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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.

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How to Use

About the LBM Calculator

What it calculates

This lbm calculator estimates health and fitness metrics from your personal inputs. Calculate lean body mass and fat-free mass.

When to use it

Use for personal wellness tracking and education. Consult a healthcare provider for medical advice.

Example

Adjust the inputs above to model your specific scenario with the LBM Calculator.

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