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Lean Body Mass from Weight and Body Fat Calculator

LBM = weight × (1 − BF%/100).

Calculates lean body mass (LBM) and fat mass from total body weight and body fat percentage. LBM includes muscles, bones, organs, and fluids.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

LBM = W × (1 − BF/100); Fat mass = W − LBM

In depth

Calculates lean body mass (LBM) and fat mass from total body weight and body fat percentage. LBM includes muscles, bones, organs, and fluids.