Lean Body Mass
Fat-Free Mass
Calculate your lean body mass (muscle, bone, organs) from your weight and body fat percentage.
Free Lean Body Mass Calculator
Calculate your lean body mass (muscle, bone, and organs) and fat mass from your weight and body fat percentage.
Understanding Lean Body Mass
Lean body mass (LBM) represents everything in your body that isn't fat — muscles, bones, organs, water, and connective tissue. It's a more useful measure than total weight for assessing fitness and health.
Formula
Lean Body Mass = Weight × (1 - Body Fat % / 100) Fat Mass = Weight - Lean Body Mass
Why Lean Body Mass Matters
Higher LBM means a higher basal metabolic rate. Better indicator of fitness than weight alone. Helps set accurate protein and calorie targets. Useful for tracking body recomposition progress.
Formula
Tips & Limitations
Medical Disclaimer
This calculator provides estimates based on your input. Results depend on the accuracy of your body fat percentage measurement. For precise body composition analysis, consider DEXA scanning or consultation with a healthcare provider.