FFMI Calculator (Fat-Free Mass Index)
Calculate your Fat-Free Mass Index to assess your muscle mass relative to your height. FFMI is a more accurate indicator of muscularity than BMI for athletic individuals.
years
kg
cm
%
FFMI Formula
FFMI = (Lean Body Mass in kg) / (Height in meters)²
Lean Body Mass = Weight × (1 – Body Fat Percentage / 100)
Adjusted FFMI adds 6.1 × (1.8 – Height in meters) to account for height differences
| Metric | Value | Interpretation |
|---|---|---|
| Lean Body Mass | – | – |
| FFMI | – | – |
| Adjusted FFMI | – | – |
| Muscle Potential | – | – |
FFMI Classification
Your FFMI Progress
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