Lean Body Mass Calculator
Enter your weight and body fat percentage to calculate lean body mass — the foundation of strength and metabolism.
Don’t know your body fat? Use our Body Fat Calculator first.
Frequently Asked Questions
Why does lean body mass matter?
LBM determines your basal metabolic rate (BMR) — the more lean mass you have, the more calories you burn at rest. It’s also the foundation of strength and athletic performance. Preserving LBM during fat loss is critical.
What is a healthy lean body mass?
LBM varies by body size, so there is no universal target. More useful is tracking body fat percentage — aiming for 10-20% for men and 18-28% for women indicates healthy LBM-to-fat ratios.
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