Loading calculator…
Use this lean body mass calculator for a clear health & fitness estimate. Results update instantly in your browser.
What this calculator does
Estimate weight excluding body fat.
How to use this calculator
- Enter body weight and body-fat percentage.
- Review the calculation assumptions before using the result.
- Lean mass is useful for tracking composition changes.
How to calculate
Lean body mass uses the Boer equation: 0.407W + 0.267H − 19.2 (men) or 0.252W + 0.473H − 48.3 (women).
Enter the values requested by the lean body mass calculator.
Worked example
Use the default values as a worked example, then replace them with your own figures.
Understanding your result
Lean mass is useful for tracking composition changes.
- Its accuracy depends on the body-fat estimate.
- Double-check values and units before calculating.
This calculator is educational and is not financial or medical advice.
Frequently asked questions
What does this lean body mass calculator do?
Estimate weight excluding body fat.
How do I use this lean body mass calculator?
Enter body weight and body-fat percentage.
What does the result mean?
Lean mass is useful for tracking composition changes.
What should I check before relying on it?
Its accuracy depends on the body-fat estimate.