Lean Body Mass Calculator
Compare established lean-body-mass equations and show estimated fat-free mass in kilograms and pounds.
Enter or adjust the values above, then calculate.
Lean Body Mass: boer, Hume & James Estimates
Compare established lean-body-mass equations and show estimated fat-free mass in kilograms and pounds.
Inputs this tool uses
- Sex used by the formula
- Height
- Weight
What you get
Boer lean-body-mass estimate.
How to use the Lean Body Mass Calculator
- Enter sex used by the formula, height, weight.
- Select any method, activity level or option shown on this page, then choose Calculate.
- Read the main result together with the supporting values, method, assumptions and limitations below before using the estimate.
How this calculation works
Lean body mass is estimated with an established sex-specific equation and displayed in metric and US units.
Example calculation
The sample values loaded into the calculator produce 49.8 kg. This example exists to show how the output is structured; replace the sample values with your own inputs for your calculation.
Assumptions and limitations
- Anthropometric formulas are estimates and can differ from direct clinical measurements.
- Results are educational screening/reference values and do not diagnose health conditions.
Sources and review status
Source set last verified 2026-09-25. No clinician review is claimed unless a real named reviewer is displayed.
Connected tools
Continue with the closest related calculation without re-entering sensitive values automatically.
Estimate adult body-fat percentage with the Deurenberg BMI-age-sex model and show its uncertainty and limitations.
Open tool →◒FFMI CalculatorCalculate fat-free mass index and height-normalized FFMI from height, weight and body-fat percentage.
Open tool →◒Body Adiposity Index CalculatorCalculate Body Adiposity Index from hip circumference and height and explain the model’s population limitations.
Open tool →