Fat-Free Mass Index Calculator
Fat-Free Mass Index (FFMI)
Measures muscle and other fat-free tissue relative to height — a "muscle BMI" for lifters
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StartAbout FFMI
FFMI measures fat-free mass relative to height — a "muscle BMI". The normalized value removes height bias for fair comparison.
Formulafat-free mass(kg) ÷ height(m)² → normalized to 1.8m
Standards
Below Average<18Average18-20Good20-22Excellent22-24Very High≥24
- ~25 for men and ~22 for women is already very high; rarely exceeded naturally, very high values may suggest enhancement
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About this tool
What is Fat-Free Mass Index Calculator?
An index of fat-free mass (muscle, bone, etc.) relative to height — essentially a "muscle BMI".
What is it for?
Lets lifters gauge muscle mass and growth potential, and see how close they are to the natural muscle ceiling.
How to read your result
For men: ~18 average, 20 good, 22–23 near the natural limit, >25 rare (often involves drugs). Women run about 3–4 points lower.