Lean Body Mass Calculator
Estimate your lean body mass using multiple validated formulas.
Results
Boer Formula-
James Formula-
Hume Formula-
Average LBM-
LBM Percentage-
What is Lean Body Mass?
Lean Body Mass (LBM) is everything in your body except fat mass. It includes muscles, bones, organs, and water. Knowing your LBM helps with protein intake planning, medication dosing, and tracking fitness progress.
How to Use
- Select your preferred units (metric or imperial).
- Enter your gender, weight, and height.
- Click Calculate to see LBM estimates from Boer, James, and Hume formulas.
FAQ
Which formula is most accurate?
All three are validated estimation methods. The average of all three often provides a reasonable estimate for most people.
What is a healthy LBM percentage?
It varies by gender and fitness level. Men typically range 75-90% and women 65-85%.
Does LBM include water weight?
Yes. LBM includes all non-fat tissue, which contains a significant amount of water.
Can I use this for medication dosing?
This calculator provides estimates. Always consult a healthcare provider for clinical dosing decisions.