Fat-Free Mass Index Calculator
Calculate your Fat-Free Mass Index (FFMI) - a measure of muscle mass that helps assess muscular development and natural potential.
Your Information
FFMI Formula
FFMI = Fat-Free Mass / Height²
Normalized FFMI = FFMI + 6.1 × (1.8 - Height)
About FFMI
FFMI was developed to compare muscularity across different heights. Research suggests a normalized FFMI of ~25 represents the natural limit for drug-free male athletes, while values above this may indicate performance-enhancing substance use.
Fat-Free Mass Index
22.2
FFMI
22.5
Normalized
Excellent
Superior muscular development - very fit.
Natural Limit Progress
90.0%of estimated natural limit
Estimated natural limit: 25 (normalized FFMI)
Body Composition
Fat-Free Mass68.0 kg
Fat Mass12.0 kg
BMI26.1
FFMI Reference (Males)
Average18-20
Above Average20-22
Excellent22-25
Suspected Natural Limit~25
Elite/Enhanced25+