Use our Lean Body Mass Calculator to estimate your muscle mass and track your fitness progress. Get accurate results based on weight, height, and gender
Enter weight and height to calculate.
Lean Body Mass (LBM) is the weight of your body minus fat. It includes muscles, bones, water, and organs. The Lean Body Mass Calculator by ToolsGen helps you estimate your LBM based on your weight and body fat percentage.
Knowing your lean mass is useful for athletes, bodybuilders, and anyone tracking their fitness progress.
LBM is calculated by subtracting body fat from total body weight:
LBM = Total Weight × (1 - Body Fat %)
For example, if you weigh 80 kg with 20% body fat:
LBM = 80 × (1 - 0.20) = 64 kg
Lean body mass is important because:
✔ Strength training with progressive overload
✔ Adequate protein intake (1.6-2.2g per kg)
✔ Sufficient sleep (7-9 hours)
✔ Proper hydration
✔ Caloric surplus for muscle building
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