FFMI Calculator Online

Fat Free Mass Index (FFMI) Calculator Description

The formula for calculating Fat Free Mass Index is

Total body fat = Weight * (
body fat / 100
)

Fat Free Mass = Weight * (1 - (
body fat / 100
)

Fat Free Mass Index (FFMI) =
Fat Free Mass / height2


Normalized FFMI = FFMI + 6.1 * (1.8 - height)

Example of Calculations:

Height: 1.7 m

Weight: 43 kg

Body Fat: 23%

Total body fat = 43 * (
23 / 100
) = 9.9 kg

Fat Free Mass = 43 * (1 - (
23 / 100
) = 33.1 kg

Fat Free Mass Index (FFMI) =
33.1 / 1.72
= 11.5 kg/m2

Normalized FFMI = 11.5 + 6.1 * (1.8 - 1.7) = 12.1 kg/m2

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