FFMI Calculator: Fat-Free Mass Index
Calculate your Fat-Free Mass Index to measure muscle potential.
What is FFMI?
Fat-Free Mass Index (FFMI) is an alternative to BMI that accounts for muscle mass. It is used to determine the amount of muscle a person carries relative to their height.
The Scale
- 118 - 20: Average male.
- 220 - 22: Athletic / Distinct musculature.
- 323 - 25: Elite natural bodybuilder limit.
- 426+: Generally considered unattainable naturally (suggests steroid use).
Fitness FAQs
Q
Why is BMI bad for bodybuilders?
BMI only looks at weight and height. A muscular athlete might be classified as 'obese' by BMI, whereas FFMI correctly identifies that weight as muscle.
Q
Is 25 truly the natural limit?
It is a statistical guideline based on pre-steroid era bodybuilders. Some genetic outliers may push slightly past 25, but it is rare.