FFMI Calculator
Calculate Fat-Free Mass Index to evaluate your muscular development relative to height.
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FFMI
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Fat-Free Mass
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Adjusted FFMI
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Rating
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What Is FFMI?
FFMI (Fat-Free Mass Index) measures your amount of muscle relative to your height. It's a better indicator of muscularity than BMI.
Formula
FFMI = Fat-Free Mass / Height² (in meters)Example
An 80 kg person at 178 cm with 15% body fat has an FFMI of 21.5 — above average muscularity.
Frequently Asked Questions
What's a natural FFMI limit?
Natural lifters rarely exceed an FFMI of 25. Values above 25 strongly suggest anabolic steroid use.
What's a good FFMI?
Average is 18-20, good is 20-22, excellent is 22-25 for men.