Calculate your lean body mass using Boer, James, and Hume formulas.
Lean body mass (LBM) is your total weight minus fat — it includes muscle, bone, organs, and water. This calculator uses three validated formulas (Boer, James, Hume) and averages them for a more reliable estimate.
Boer, James, and Hume results side by side.
Derived from weight minus lean mass.
Averages all three for a balanced estimate.
Full dual-unit support.