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FFMI Calculator
Calculate your Fat-Free Mass Index — the muscle-to-height ratio used to assess natural muscle building potential
lbs
Your total body weight — the starting point for calculating fat-free mass
ft
in
Your standing height — used as the denominator in the FFMI formula
%
3%30%60%
Your estimated body fat percentage — accuracy here directly affects FFMI accuracy. A 5% error can shift FFMI by 2–3 points.
Note: FFMI accuracy depends heavily on an accurate body fat measurement. If you do not know your body fat %, use a body fat calculator first.
Calculate Your FFMI
Select your sex and unit system, enter your weight, height, and body fat percentage, then click Calculate FFMI to see your results.
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How to Use the FFMI Calculator
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