Lean Body Mass Calculator
Estimate lean body mass (LBM) using empirical formulas or calculate directly from body fat percentage.
Body Settings
Body Composition Analysis
| Formula | Lean Mass (LBM) | Fat Mass | Body Fat % |
|---|---|---|---|
| Boer Formula (1984) | 58.0 kg (128.0 lbs) | 17.0 kg (37.4 lbs) | 22.6% |
| James Formula (1976) | 59.0 kg (130.1 lbs) | 16.0 kg (35.3 lbs) | 21.3% |
| Hume Formula (1966) | 54.4 kg (120.0 lbs) | 20.6 kg (45.3 lbs) | 27.4% |
Body Mass Breakdown
Lean: 76.2%Fat: 23.8%
Daily Protein Recommendations
101g - 151g
Based on an active guideline of 0.8g to 1.2g of protein per pound of lean body mass. Adjust according to training density.
LBM Formulas: The Boer, James, and Hume algorithms calculate target fat-free limits using height-weight regression matrices.
Understanding Lean Body Mass benchmarks
Lean body mass represents the weight of muscles, bones, ligaments, tendons, organs, and water — everything in the body except stored fat.
Tracking body composition is key for strength athletes. Protein intake calculations leverage lean mass metrics to prevent muscle breakdown.
Private & free — this tool runs entirely in your browser.
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