Lean Body Mass Calculator
Calculate your lean body mass using multiple formulas.
Lean body mass includes:
- Skeletal muscle
- Bones
- Organs
- Skin
- Body water
What Affects LBM?
Factors that affect lean body mass include genetics, age, hormone levels, physical activity, and nutrition. Resistance training and adequate protein intake are the most effective ways to increase LBM.
LBM and Metabolism
More lean body mass means a higher basal metabolic rate. Each pound of muscle burns approximately 6 calories per day at rest, compared to 2 calories per pound of fat.
Frequently Asked Questions
Lean body mass (LBM) is your total body weight minus your fat mass. It includes muscles, bones, organs, skin, and water—everything except fat.
LBM helps determine protein needs, medication dosages, and fitness goals. It's also useful for tracking muscle gain or loss during training or dieting.
The Boer formula and Hume formula are generally considered most accurate. Using multiple formulas and averaging them provides a reasonable estimate.
Resistance training, adequate protein intake (1.6-2.2g/kg of body weight), and progressive overload are key to building lean muscle mass.