// FREE TOOL · FROM VIVE
Everything that isn't fat.
Your lean body mass — muscle, bone, organs, and water — estimated from your weight and, if known, your body fat %.
LEAN BODY MASS
58.0 kg
Estimated — Boer formula
ESTIMATED FAT MASS
17.0 kg
LEAN MASS SHARE
77%
of total weight
// FAQ
Good to know
Why does it matter?+
Lean mass drives your metabolism and is what strength training and adequate protein aim to preserve during a fat-loss phase — losing weight without losing lean mass is the real goal.
What if I don’t know my body fat %?+
We fall back to the Boer formula, a well-validated estimate from weight, height, and sex alone. For a more precise number, use our Body Fat % (US Navy) calculator first.
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