Lean Body Mass Calculator
Calculate your lean body mass and muscle mass based on your weight and body fat percentage.
Adjust body fat percentage to see how it affects your lean mass calculations
Total Weight
0 kg
100%
Lean Body Mass
0 kg
85.0%
Body Fat
0 kg
15.0%
Muscle Mass Estimate
Estimated Muscle Mass
0 kg
Approximately NaN% of total body weight
Muscle mass is estimated by subtracting bone and organ mass (~15% of total weight) from lean body mass. This is an approximation and may vary based on individual factors.
Improves TDEE accuracy if known
About Lean Body Mass
Formulas:
Lean Body Mass = Weight × (1 - Body Fat % / 100)
Muscle Mass ≈ Lean Body Mass - (Weight × 0.15)
Important Notes:
• Lean Body Mass includes muscle, bones, organs, and water - everything except fat.
• Muscle mass is estimated by subtracting bone and organ mass (~15% of body weight) from LBM.
• Tracking LBM over time helps monitor muscle gain during bulking or muscle preservation during cutting.
• For accurate body fat percentage, use calipers, DEXA scan, or the Navy method calculator.