BMI(body mass index) is calculated from the height and the weight. FFMI(fat free mass index) is calculated from the height, the weight, and the fat ratio.
ffmi = weight[kg] x (1 - fat ratio) ÷ (height[m])2
= lean body mass(weight excluding fat)[kg] ÷ (height[m])2
Athletes usually check his/her FFMI.
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