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About This Tool
The Lean Body Mass Calculator determines how much of your total body weight is lean tissue (muscle, bone, organs, water) versus fat. Simply enter your body weight and body fat percentage to get your lean mass and fat mass breakdown.
Lean body mass (LBM) is calculated as: LBM = Weight × (1 - Body Fat Percentage / 100). This metric is crucial for setting accurate protein intake goals, monitoring muscle gain during training programs, and assessing overall body composition.
Lean body mass is a better indicator of metabolic rate and physical fitness than total weight alone. Higher lean mass generally means a higher metabolic rate, better insulin sensitivity, and improved physical performance.