FFMI Calculator Ajax
Estimate your Fat-Free Mass Index (FFMI) and normalized FFMI (to 1.80 m). Results update instantly.
Tip: Use your current body weight. Units convert automatically on change.
%
Tooltip: Estimated proportion of body fat. Accepts 0–70%.
cm
Tooltip: Enter either in cm, or in feet and inches. Switching modes converts values.
Reload clears inputs & results.
Live Results
Fat-free mass
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FFMI
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Normalized FFMI (to 1.80 m)
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Category
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Step-by-step derivation
Enter values to see the algebra with your numbers.
Quick summary
Results will appear here when you add your weight, body fat, and height.