What is FFMI

FFMI stands for fat free body mass index with which you can calculate the amount of muscle mass relative to height. This index used by bodybuilders to compare themselves to others. Also FFMI is a an alternative to body mass index.

FFMI formula

Total Body Fat = Weight * (body fat [%] / 100)

Lean Weight = Weight * (1 - (body fat [%] / 100)

FFMI = (Lean Weight / 2.2) / ((Feet * 12.0 + Inches) * 0.0254)2

Adjusted FFMI = FFMI + ( 6.3 * (1.8 - (Feet * 12.0 + Inches) * 0.0254)

FFMI interpretation

The calculated normalized ffmi can be interpreted using the tables below. You also need to consider that the interpretation for men and women will be different, so there are 2 tables.

This design is inspired by the next page: FFMI Calculator