How to use the Lean Body Mass Calculator
Lean body mass is everything except fat. This tool estimates it with the Boer and James formulas.
Open the Lean Body Mass Calculator →
What you need to enter
- Sex
- Height (cm)
- Weight (kg)
The formula
Boer (men): 0.407 × weight + 0.267 × height − 19.2. Women: 0.252 × weight + 0.473 × height − 48.3.
Worked example
Using the default values in the calculator:
- Sex: Male
- Height (cm): 175
- Weight (kg): 75
| Lean mass (Boer) | 58 kg |
| Lean mass (James) | 59 kg |
| Body fat (Boer) | 22.6% |
Tips for better results
- Use it with body fat to track composition.
- Strength training raises lean mass.
Common mistakes to avoid
- Using the result as a precise measurement.
- Ignoring the difference between formulas.
Please note: Health calculators and guides give general estimates, not medical advice. Talk to a doctor or other qualified professional about your own health. See our Disclaimer.