Lean Body Mass Calculator
Calculate lean body mass (fat-free mass) with the Boer formula from your weight and height.
- Lean body mass (women)
- 52.1 kg
- Body fat mass (men)
- 14 kg
Formula: Men: LBM = 0.407×W + 0.267×H − 19.2 | Women: LBM = 0.252×W + 0.473×H − 48.3
About Lean Body Mass Calculator
Lean Body Mass Calculator is a free online calculator that gives you an instant, accurate result as you type. Calculate lean body mass (fat-free mass) with the Boer formula from your weight and height.
The calculation uses the standard formula Men: LBM = 0.407×W + 0.267×H − 19.2 | Women: LBM = 0.252×W + 0.473×H − 48.3 and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
The Boer formula (1984) is widely used clinically and is considered one of the best-validated lean body mass predictors for adults.
Results are estimates for educational purposes and not medical advice.
Frequently Asked Questions
Is Lean Body Mass Calculator free to use?
Yes. Lean Body Mass Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (Men: LBM = 0.407×W + 0.267×H − 19.2 | Women: LBM = 0.252×W + 0.473×H − 48.3) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
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