FFMI Calculator
Calculate your Fat-Free Mass Index (FFMI) and normalized FFMI. Estimate lean mass relative to height and see how it compares to population norms.
BodyStd · https://bodystd.com/ · 9/5/2026
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FFMI Calculator
Calculate your Fat-Free Mass Index (FFMI) and normalized FFMI. Estimate lean mass relative to height and see how it compares to population norms.
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in
%
FFMI Result
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Normalized FFMI Classification (male)
Below average< 18
Average18 - 20
Above average20 - 22
Excellent22 - 23
Superior23 - 26
Suspicious (potential PED)>= 26
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Authority Source
FFMI computation and reference ranges follow the validated cut-offs reported in fat-free mass index research.FFMI validation study.
Frequently Asked Questions
FFMI (Fat-Free Mass Index) measures the amount of lean (non-fat) mass relative to height, while BMI measures total weight relative to height. FFMI is more useful for athletic populations because it distinguishes muscle mass from fat mass.
Disclaimer: This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition.