Lean Body Mass (LBM) Calculator

Use this lean body mass (lbm) calculator for an approximate adult fitness calculation. Choose US units for pounds, inches or yards, or switch to metric. Results are estimates, not medical or training prescriptions.

Your Numbers

Sex

Body Weightkg

Heightcm

Results

Lean Body Mass—

Estimated Fat Mass—

Lean Mass Percentage—

Input check—

Results update live as you type. Estimates only — not financial, tax, or investment advice.

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The Formula

Men: LBM = (0.407 × weight kg) + (0.267 × height cm) − 19.2; Women: LBM = (0.252 × weight) + (0.473 × height) − 48.3

Understanding the Lean Body Mass (LBM) Calculator

Worked example: For an 80 kg (176.4 lb), 180 cm (70.9 in) male, Boer estimates 61.42 kg (135.4 lb) lean mass.

Lean mass includes water, organs and bone, not just muscle. A population equation may be unsuitable for an individual; invalid estimates are withheld rather than treated as measured body fat.

Frequently Asked Questions

How is the result calculated?

Men: LBM = (0.407 × weight kg) + (0.267 × height cm) − 19.2; Women: LBM = (0.252 × weight) + (0.473 × height) − 48.3

What should I know about this estimate?

Lean mass includes water, organs and bone, not just muscle. A population equation may be unsuitable for an individual; invalid estimates are withheld rather than treated as measured body fat.