Fat-Free Mass Index (FFMI) Calculator

Fat-Free Mass Index (FFMI) measures how much lean mass you carry relative to your height, commonly used to assess muscularity independent of body fat.

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FFMI
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Formula

FFMI = Lean Mass(kg) / Height(m)²

Learn How This Works

Body Composition Indices Beyond BMI

Body Adiposity Index, BMI Prime, Ponderal Index, waist-to-height ratio, and FFMI — five alternative ways to assess body composition.

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