Estimate lean body mass from weight, height and sex using Boer formula — see LBM, body fat mass and ideal weight range.
Estimate lean body mass from weight, height and sex using Boer formula — see LBM, body fat mass and ideal weight range.
Enter values above and click Calculate — results will appear here with the formula explained.
Lean body mass is total mass minus estimated fat mass, where fat percentage is derived from the Boer or James equations that regress on height, weight, sex and sometimes circumference. The calculator first estimates body fat using those anthropometric formulas, then subtracts fat mass to yield LBM in kilograms — so a 80 kg person at 18% body fat carries roughly 65.6 kg of lean tissue including muscle, organs, bone and water. It is screening arithmetic, not DEXA imaging, and accuracy is typically within a few kilograms for population use.
LBM reframes protein, calorie and drug dosing decisions that should scale with lean tissue rather than total weight — an 80 kg athletic build and an 80 kg higher-fat build warrant different prescriptions but share the same scale number. Track LBM directionally during a cut: if LBM holds while total mass falls, the deficit is preferentially fat.
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Lean body mass is total mass minus estimated fat mass, where fat percentage is derived from the Boer or James equations that regress on height, weight, sex and sometimes circumference. The calculator first estimates body fat using those anthropometric formulas, then subtracts fat mass to yield LBM in kilograms — so a 80 kg person at 18% body fat carries roughly 65.6 kg of lean tissue including muscle, organs, bone and water. It is screening arithmetic, not DEXA imaging, and accuracy is typically within a few kilograms for population use. Formula: Boer: Male LBM = 0.407*weight + 0.267*height -19.2; Female = 0.252*weight + 0.473*height -48.3
Lean Body Mass Calculator: Estimate lean body mass from weight, height and sex using Boer formula — see LBM, body fat mass and ideal weight range. Formula: Boer: Male LBM = 0. Example: At 80kg, 178cm, male: LBM about 60.
Estimate lean body mass from weight, height and sex using Boer formula — see LBM, body fat mass and ideal weight range. Formula: Boer: Male LBM = 0.407*weight + 0.267*height -19.2; Female = 0.252*weight + 0.473*height -48.3
| Field | What to enter |
|---|---|
| Weight (kg) | e.g. 80 |
| Height (cm) | e.g. 178 |
| Sex | Enter a value |
All fields use the exact formulas shown below — results include step-by-step breakdowns you can verify by hand.
Lean body mass is total mass minus estimated fat mass, where fat percentage is derived from the Boer or James equations that regress on height, weight, sex and sometimes circumference. The calculator first estimates body fat using those anthropometric formulas, then subtracts fat mass to yield LBM in kilograms — so a 80 kg person at 18% body fat carries roughly 65.6 kg of lean tissue including muscle, organs, bone and water. It is screening arithmetic, not DEXA imaging, and accuracy is typically within a few kilograms for population use.
LBM reframes protein, calorie and drug dosing decisions that should scale with lean tissue rather than total weight — an 80 kg athletic build and an 80 kg higher-fat build warrant different prescriptions but share the same scale number. Track LBM directionally during a cut: if LBM holds while total mass falls, the deficit is preferentially fat.
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At 80kg, 178cm, male: LBM about 60.1kg, fat mass ~19.9kg, LBM 75.1% of weight.
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