How it's calculated
LBM = average of Boer, James and Hume estimates
Boer (men) = 0.407·W + 0.267·H − 19.2; James = 1.10·W − 128·(W/H)²; Hume = 0.328·W + 0.339·H − 29.5. W = weight (kg), H = height (cm); women use the female coefficients. Body fat = W − LBM.
Common questions
What is lean body mass?
It is your total weight minus your fat mass, covering muscle, bone, organs, and water.
Why three formulas?
Boer, James, and Hume each estimate slightly differently, so seeing all three gives a more reliable range than any single one.