FFMI Calculator
Calculate FFMI
Calculate your Fat-Free Mass Index
kg
%
cm
Formula
Lean Mass = Weight × (1 - Body Fat% / 100) | FFMI = Lean Mass / Height(m)² | Adjusted FFMI = FFMI + 6.1 × (1.8 - Height(m))
Frequently Asked Questions
What is FFMI?
Fat-Free Mass Index (FFMI) measures the amount of muscle mass relative to height. It is similar to BMI but focuses on lean tissue, making it more useful for evaluating muscular development.
What is a good FFMI score?
For men: 18-20 is average, 20-22 is above average, 22-25 is excellent. For women: 15-17 is average, 17-19 is above average, 19-22 is excellent. Values above 25 (men) or 22 (women) are considered near the natural limit.
What is the natural FFMI limit?
Research suggests that an FFMI of about 25 for men and 22 for women represents the approximate upper limit achievable without performance-enhancing drugs. A landmark 1995 study by Kouri et al. found that non-steroid users rarely exceeded 25.
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