Fat mass
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Lean Body Mass Calculator
Calculate how much of your body weight is lean tissue —muscle, bone, and organs —versus fat mass. A key metric for athletes and body composition tracking.
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Lean body mass
Lean %
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How lean body mass is estimated
LBM = total weight minus fat mass. Uses Boer equation: Men = 0.407×kg + 0.267×cm − 19.2. Women = 0.252×kg + 0.473×cm − 48.3. Or simply subtract estimated fat from total weight.
Frequently asked questions
How accurate are the results?
Formulas used here are validated in population studies but cannot account for individual genetics, body composition, or medical conditions. Treat results as a starting point, not a medical diagnosis.
Should I consult a professional?
If you have specific health concerns, existing conditions, or are planning significant lifestyle changes, consult a qualified healthcare provider (doctor, dietitian, physiologist).
How often should I recalculate?
Recalculate when your weight changes more than 5%, activity level shifts significantly, or every 3-6 months for routine monitoring. Results are snapshots — your body changes daily.
Last updated
For general wellness information only, not medical advice — see our disclaimer.