💪 Lean Body Mass Calculator
Calculate your lean body mass (fat-free weight)
How Lean Body Mass Calculation Works
Formula
LBM (Boer) = 0.407 × weight(kg) + 0.267 × height(cm) − 19.2 (men)
- 1Enter your weight, height, and gender.
- 2The calculator applies multiple LBM formulas (Boer, James, Hume).
- 3LBM is estimated by subtracting estimated fat mass from total weight.
- 4Results show LBM in kg/lbs and as a percentage of total weight.
- 5A comparison of results from different formulas is provided.
About Lean Body Mass Calculator
Calculate your lean body mass (LBM) — the weight of everything in your body except fat. Uses the Boer, James, and Hume formulas based on height, weight, and gender.
Frequently Asked Questions
What is lean body mass?
Lean body mass is your total weight minus fat weight. It includes muscles, bones, organs, water, and everything except stored fat. A higher LBM generally indicates more muscle mass and better metabolic health.
What is a normal lean body mass percentage?
For men, LBM is typically 70-90% of total weight (10-30% body fat). For women, LBM is typically 65-85% of total weight (15-35% body fat). Athletes tend to have higher LBM percentages.
Why is lean body mass important?
LBM determines your basal metabolic rate (more muscle burns more calories), helps set protein intake goals, and provides better insight than total weight alone since muscle weighs more than fat.