Lean Body Mass Calculator

Lean body mass is everything you weigh that is not fat: muscle, bone, organs and water. Enter sex, height and weight in metric or imperial to get three published estimates, from the Boer, James and Hume equations, plus their average and the fat mass that leaves. All three are regressions fitted to population samples, so they are estimates and they disagree by a kilogram or two, which is why the spread is shown. If you already have a measured body fat percentage, the body fat calculator gives a firmer answer.