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Lean Body Mass (Boer vs James vs Hume)
Compare your lean body mass side-by-side using Boer, James, and Hume scientific formulas.
Comparing Scientific LBM Calculations
Your **Lean Body Mass (LBM)** represents the weight of everything in your body except fat. Three main equations dominate medical research: the **Boer formula** (accurate for standard physiques), the **James formula** (developed in 1976, which can underestimate LBM in extremely obese individuals), and the **Hume formula** (often used for medication dosages).
Frequently Asked Questions
The Boer and Hume formulas are widely considered the most consistent for modern bodybuilder physiques.
No. LBM includes bone, organs, skin, water, and skeletal muscle tissue. Muscle mass is a sub-component of LBM.