Lean Body Mass Calculator
Estimate lean body mass using validated clinical formulas
Choose your units and profile, then compare LBM from Boer, James, Hume, Janmahasatian, and Peters (child mode). All calculations run in your browser.Input details
Results
Typical range check pendingAverage LBM across active formulas
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Average LBM percentage
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| Formula | LBM (kg) | LBM (lb) | LBM % | Body Fat % |
|---|---|---|---|---|
| Enter values to see results. | ||||
Graphical representation (LBM in kg)
Formulas: Boer (1984), James (1976), Hume (1966), Janmahasatian (2005), Peters (children under 14).
Reference Notes
Typical Reference Values (Lean Body Mass %)
- Men: LBM is often around 70% to 85% of body weight.
- Women: LBM is often around 60% to 75% of body weight.
- Athletes: often higher due to more muscle mass.
Why Multiple Formulas?
- Boer: common clinical use, including drug dosing contexts.
- James: pharmacology context; may underestimate in obesity.
- Hume: simple and commonly used in hospital contexts.
- Janmahasatian: often performs better in overweight/obese populations.