WHAT'S YOUR FFMI?

Fat-Free Mass Index (FFMI) measures all non-fat mass that you have relative your height: your skeletal muscle, body water, bones and minerals, organs, blood, connective tissue, glycogen stores. Unlike BMI, it ignores fat, so tracking it can serve as a proxy for your muscular development, and not just your size. Knowing your FFMI tells you where you stand against other adults, how close you are to your natural genetic ceiling, and gives you a number to actually train toward. Enter your stats below to find yours.