Muscle gainCalculator
FFMI Calculator
Your fat-free mass index, normalised for height, the measure behind the often quoted ceiling of about 25 for drug-free men.
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Read it with care
The ceiling of about 25 comes from one sample of 157 men, so it is a rough upper edge, not a rule, and the study included no women. FFMI also inherits every error in the body fat estimate you give it: a few points of body fat moves the result by a full point or more.
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Formula sources
- Kouri, E.M. et al. (1995). Fat-free mass index in users and nonusers of anabolic-androgenic steroids. Clin J Sport Med 5(4).157 male athletes. Non-users topped out around 25; many users went past it. The 6.3 height correction is from this paper.