Lean Body Mass Calculator
Estimate your lean body mass (fat-free mass) using three scientific formulas.
Frequently Asked Questions
What is lean body mass (LBM)?
Lean body mass is your total body weight minus your fat mass. It includes muscles, bones, organs, skin, and body water. LBM is important for metabolism, strength, and overall health.
How is LBM different from muscle mass?
LBM includes all non-fat tissue, not just muscles. While muscle is the largest component, LBM also includes bones (~15%), organs, skin, and water. Pure muscle mass is typically 40-50% of LBM.
Why is knowing my LBM useful?
LBM helps you set realistic fitness goals, calculate accurate calorie needs, and track body composition changes. It's more meaningful than total weight because it shows changes in muscle vs fat.
How accurate are these LBM estimates?
These formulas provide estimates with ~5-10% accuracy for most people. For precise measurements, consider DEXA scans, hydrostatic weighing, or BIA scales. Use these estimates for general guidance.
About LBM Calculation
These formulas estimate LBM based on height and weight, using statistical relationships derived from body composition studies. They work well for average populations but may be less accurate for athletes or those with unusual body compositions.