Fat-Free Mass Index Calculator
FFMI from Body Fat %
Calculate FFMI using weight, height, and body fat percentage
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FFMI from Lean Mass
Calculate FFMI directly from lean body mass and height
Formula
FFMI = Lean Mass (kg) / Height (m)^2 | Adjusted FFMI = FFMI + 6.1 * (1.8 - height_m)
Frequently Asked Questions
What is FFMI?
Fat-Free Mass Index (FFMI) measures your lean body mass relative to your height. It is similar to BMI but focuses on muscle mass. An FFMI of 25 is considered near the natural limit for men.
What is a good FFMI score?
For men: 18-20 is average, 20-22 is above average, 22-25 is excellent to superior. For women: 14-16 is average, 16-18 is above average, 18-20 is excellent. Values above 25 (men) or 22 (women) may indicate anabolic steroid use.
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