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.
Important Health Disclaimer
This calculator provides general health information based on standard medical formulas and WHO guidelines. Results are for informational and educational purposes only and should not be considered as professional medical advice, diagnosis, or treatment recommendations.
For health concerns, medical conditions, fitness plans, or dietary decisions, please consult with qualified healthcare professionals, licensed physicians, registered dietitians, or certified fitness trainers who can evaluate your individual health status and medical history.
Individual health needs vary significantly. These calculations are general estimates and may not be appropriate for everyone, especially those with existing medical conditions, pregnant women, children, or elderly individuals.
Not a substitute for professional medical advice
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
Natural Limit Progress
Estimated natural limit: 25 (normalized FFMI)
Body Composition
FFMI Reference (Males)
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