Muscle Mass Calculator
Calculate your estimated skeletal muscle mass, Fat-Free Mass Index (FFMI), and protein requirements.
Body Measurements
If unknown, use body fat calculator or estimate
Estimated Skeletal Muscle Mass
32.3 kg
43.1% of body weight
Fat-Free Mass
61.5 kg
Fat Mass
13.5 kg
Fat-Free Mass Index (FFMI)
20.08
kg/m2
Above Average
Adjusted FFMI: 20.39
Skeletal Muscle Index
10.55
kg/m2
Average
Protein Requirements
Daily protein: 90g
Per meal (4 meals): ~23g
Muscle gain potential: 0.12-0.25 kg/week
Expected Muscle Mass Range
For men: 40-50% of body weight
Disclaimer: These calculations provide estimates based on population equations. Actual muscle mass can only be accurately measured with DEXA, BIA, or MRI. Results may vary based on individual body composition and measurement accuracy.