Lean Body Mass Calculator
Boer LBM in kg from height and weight — not Navy body-fat %. Click any i for detail.
Size
Sex
i
Sex
Picks Boer/James coefficients. |
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|---|---|
Units
i
Units
US or metric. |
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Height (ft)
i
Feet
Whole feet. |
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Height (in)
i
Inches
Extra inches. |
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Weight (lb)
i
Pounds
Scale weight. |
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Height (cm)
i
cm
Height. |
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Weight (kg)
i
kg
Weight. |
How to use this calculator
- Pick sex for Boer/James coefficients.
- Enter height and weight in US or metric units.
- Read Boer lean body mass in kg.
- Compare James in the breakdown when shown.
Results explained
Estimates fat-free mass from height and weight only. Navy body-fat uses circumferences. DEXA is the lab gold standard.
Quick reference: Boer LBM
Men: LBM ≈ 0.407W + 0.267H − 19.2 (kg, cm).
| Item | Detail |
|---|---|
| Men Boer | 0.407W + 0.267H − 19.2 |
| Women Boer | 0.252W + 0.473H − 48.3 |
| W, H units | kg and cm internally |
| Athletes | height-weight LBM misses muscularity detail |
Edema and amputation break simple formulas.
How the estimate is built
Boer LBM from weight_kg and height_cm per sex-specific coefficients.
Example scenario
80 kg, 178 cm, male → Boer about 64 kg lean mass.
FAQ
How is this different from body fat %?
Body fat pages estimate fat percent; this estimates lean mass directly.
Can I use it for protein targets?
Some diets cite g/kg LBM; confirm with a clinician or dietitian.
Why two formulas?
Boer and James are both published height-weight estimates; they can differ by a few kg.