FFMI Calculator

The FFMI Calculator

With the Free Online FFMI Calculator, you can determine your Fat-Free Mass Index.

The FFMI is a valuable measure for assessing muscle mass relative to height. You have the option to choose between two calculation methods: either by inputting your body fat percentage or your lean body mass. If you're unsure about these values, you can calculate them here: Body Fat Percentage Calculator and Lean Body Mass Calculator.

Instructions

How to Interpret Your FFMI

The Fat-Free Mass Index (FFMI) calculates the fat-free mass relative to height, supplemented by a small correction factor.

Studies show that there is a natural upper limit for FFMI, which is 25 for men. An FFMI above this value could indicate possible doping use, which is why FFMI is also used in the realm of natural bodybuilding to monitor illegal substances.

FFMI also reflects the remaining potential for muscle building. It is recommended that men aim for an FFMI above 20 and women above 17.

FFMI Ranges for Men by Manuel Fally
FFMI Ranges for Women by Manuel Fally