Lean Body Mass Calculator
Lean body mass is everything you weigh except fat: muscle, bone, organs and water. Enter your height and weight, and your body fat if you know it, for a closer number.
How we got it
Without body fat: the average of the Boer (1984) and Hume (1966) formulas from height and weight, shown as plus or minus 5%. With body fat: weight x (1 - body fat %), shown with the plus or minus 4 points a tape method gives. The average formula uses the midpoint of the male and female versions.
Updated . Sources: Boer, 1984, American Journal of Physiology; Hume, 1966, Journal of Clinical Pathology.
Questions
What is a good lean body mass?
There is no single target. What matters is keeping or adding to yours, especially while losing weight or getting older.
Is lean body mass the same as muscle?
No. It also includes bone, organs and water. Muscle is usually about half of it.
How do I keep lean mass while losing weight?
Eat enough protein, train for strength 2 to 4 times a week and lose weight gently rather than fast.