FFMI Calculator
Fat-Free Mass Index, an advanced measure of muscle development relative to your height.
Your Composition
FFMI compares muscle mass relative to your height.
Enter height, weight and body fat % to see your FFMI.
What your result means
FFMI reflects how much muscle you carry relative to height, a better physique marker than BMI for trained people.
Good to know
It relies on body-fat estimates and means less for beginners or those with high body fat.
A number is a starting point, not a plan. Discuss your result with a doctor
Measure your Fat-Free Mass Index to evaluate muscularity and physique development. Popular among athletes and advanced fitness enthusiasts.
How this is calculated
Formula: FFMI = LBM (kg) ÷ Height² (m)
Adjusted FFMI = FFMI + 6.1 × (1.8 − height in m), normalizing to a 1.8 m reference height.
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