Lean Body Mass Calculator

Calculate your lean body mass and track your muscle composition.
What is Lean Body Mass?
Lean body mass (LBM) is your total body weight minus fat mass. It includes muscles, bones, organs, and water content. Essential for fitness and nutrition planning.

Results

Enter your weight and body fat percentage to see your lean mass here.
Body Composition Guidelines
  • Males 70-85% lean mass typical
  • Females 65-80% lean mass typical
  • Athletes 85-95% lean mass common

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Understanding Lean Body Mass

Lean Body Mass (LBM) represents the weight of your body minus the weight of fat. It includes muscles, bones, organs, skin, blood, and other non-fat tissues.

How is LBM Calculated?

Formula: LBM = Total Body Weight × (1 - Body Fat Percentage as decimal)

Example: If you weigh 70kg with 15% body fat:
LBM = 70 × (1 - 0.15) = 70 × 0.85 = 59.5kg lean mass

Why Track Lean Body Mass?

Improving Your Lean Body Mass

Lean Body Mass Categories

Population Typical LBM %
Sedentary Men70-80%
Sedentary Women65-75%
Active Men80-85%
Active Women75-80%
Male Athletes85-95%
Female Athletes80-90%

Frequently Asked Questions

Lean body mass includes all non-fat tissues (muscle, bone, organs, water), while muscle mass refers specifically to skeletal muscle tissue. Muscle typically makes up about 40-50% of lean body mass.

Measure monthly for general fitness tracking, or bi-weekly during intensive training phases. Changes in lean mass occur slowly, so frequent measuring isn't necessary.

Yes, through body recomposition. Combine strength training with adequate protein intake while maintaining a moderate calorie deficit to lose fat while preserving or gaining muscle.

References