Lean Body Mass (LBM) is your total body weight minus fat mass — includes muscle, bone, organs, and water. Boer Formula (Men): LBM = 0.407 × weight(kg) + 0.267 × height(cm) - 19.2. Women: LBM = 0.252 × weight(kg) + 0.473 × height(cm) - 48.3.
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💪 Lean Body Mass Calculator
Calculate your lean body mass using the scientifically validated Boer formula. Essential for tracking muscle mass and fitness progress.
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Uses the scientifically validated Boer formula. Free for fitness tracking. Not a medical diagnostic tool. No sign-up needed.
🤔 How Does This Work?
Boer Formula (Men): LBM = 0.407W + 0.267H - 19.2
Boer Formula (Women): LBM = 0.252W + 0.473H - 48.3
❓ Frequently Asked Questions
What is lean body mass used for?▼
LBM helps track fitness progress beyond just scale weight. If you gain muscle while losing fat, total weight might stay the same but LBM increases — a sign of positive body composition change that weight alone cannot show.
How is LBM different from muscle mass?▼
LBM includes ALL non-fat tissue: muscle, bone, organs, water, connective tissue. Muscle mass is just the muscle component. LBM is typically 70-90% muscle in most people but also includes significant bone and organ weight.
LBM helps track fitness progress beyond just scale weight. If you gain muscle while losing fat, total weight might stay the same but LBM increases — a sign of positive body composition change that weight alone cannot show.
How is LBM different from muscle mass?▼
LBM includes ALL non-fat tissue: muscle, bone, organs, water, connective tissue. Muscle mass is just the muscle component. LBM is typically 70-90% muscle in most people but also includes significant bone and organ weight.