Lean Body Mass Calculator
Estimate lean body mass from your body weight and body fat percentage. Informational only, not medical advice.
Lean Body Mass Calculator tool
Lean body mass is estimated as total weight × (1 − body fat fraction).
Privacy: runs locally in your browser. No values are stored or transmitted.
This calculator uses lean body mass = total body weight × (1 − body fat fraction). Fat mass is then the remainder of total body weight.
Examples
- 70 kg at 20% body fat → lean body mass ≈ 56 kg
- 154 lb at 18% body fat → lean body mass ≈ 126.28 lb
- Useful for simple body composition estimates
FAQ
- What is lean body mass?
Lean body mass is body weight minus fat mass. It includes muscle, bone, organs, water, and other non-fat tissue.
- Is this the same as muscle mass?
No. Lean body mass includes muscle, but it also includes other non-fat tissue such as bone, water, and organs.
- How is lean body mass estimated here?
This calculator uses your body weight and body fat percentage to estimate how much of your weight is non-fat mass.
- Can I use pounds or kilograms?
Yes. This calculator supports both metric and imperial input.
- Are my values stored?
No. All calculations run locally in your browser.