Fat-Free Mass

Fat-Free Mass is everything in your body that is not fat, including muscle, organs, bone, and water.

Formula and example

Item	Value
Formula	Fat-free mass = Body weight − Fat mass
Example	80 kg at 20% body fat → fat mass 16 kg, fat-free mass 64 kg

Lean Mass commonly refers to all non-fat tissues

Body Fat Percentage is the share of your body that is fat mass.

Body Composition describes how much of you is fat mass and fat-free mass.