LBM Formula
Lean body mass is calculated as total weight multiplied by one minus body fat percentage.
All calculators
Body Composition
Lean Body Mass Calculator
Lean body mass includes muscle, bone, organs, and water. It helps separate real physique progress from simple scale changes.
Live Preview
Your Lean Body Mass
Estimated lean body mass is 64 kg.
Lean Body Mass
64 kg
Fat Mass
14 kg
Lean Mass Percent
82%
Result Breakdown
Lean64 kg
Fat14 kg
Use lean mass alongside strength progress, photos, and measurements for a better body composition picture.
Using LBM in Nutrition
Lean mass can inform protein targets, body recomposition plans, and FFMI estimates.
Lean Body Mass Calculator FAQ
What is lean body mass?
Lean body mass is total body weight minus fat mass. It includes muscle and other non-fat tissue.
How do I increase lean body mass?
Lift progressively, eat enough protein, recover well, and use a calorie surplus or maintenance phase when appropriate.
Why track lean mass?
Lean mass helps you see whether weight change is likely coming from muscle, fat, or both.