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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
Enter the values requested by the lean body mass calculator.
Worked example
With the example values shown above, the lean body mass is 56 kg, and the body fat is 19.98%.
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.
How is lean body mass different from muscle mass?
Lean body mass includes everything that isn't fat — muscle, bone, organs, and water — not muscle alone, so it's a broader measure than muscle mass specifically.
Why does the accuracy depend on my body-fat estimate?
Lean body mass is calculated as total weight minus fat mass, so any error in the body-fat percentage you enter carries directly into the lean-mass result.