Free tool · body composition
FFMI calculator
Fat-free mass index — a height-normalized benchmark of how much muscle you carry, from your weight, height, and body fat.
FAQ
What is a good FFMI?
Roughly 18–20 is average, 20–22 is fit, 22–25 is very muscular, and a normalized FFMI much above ~25 is uncommon without exceptional genetics or enhancement. It's a benchmark, not a verdict.
What does 'normalized' mean?
Normalized FFMI adjusts the raw value to a standard 1.8 m height so taller and shorter people can be compared on the same scale.
Educational benchmark, not medical advice.