Lean Body Mass Calculator
Calculate your lean body mass (fat-free mass) using multiple formulas.
— kg
% of total body weight
Fat Mass
kg
Body Fat %
100.0%
Formula Comparison
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.
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.
About the LBM Calculator
This lbm calculator estimates health and fitness metrics from your personal inputs. Calculate lean body mass and fat-free mass.
Use for personal wellness tracking and education. Consult a healthcare provider for medical advice.
Adjust the inputs above to model your specific scenario with the LBM Calculator.
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