Calculate your FFMI (Fat-Free Mass Index) to see how much lean muscle you carry for your height — and how close you are to the natural limit.
≈ 25 je tipična prirodna granica — vrijednosti iznad gotovo uvijek zahtijevaju sredstva.
Dobij kompletan plan od ovih brojeva →FFMI measures your lean (fat-free) mass relative to your height — like a BMI for muscle. It's the best simple metric for how muscular you actually are, independent of fat.
Research on drug-free athletes shows a normalised FFMI around 25 is the typical natural upper limit. Most lifters land between 18 and 23; sustained values above 25 are very rarely achieved naturally.
We take your lean mass (weight minus fat), divide by height squared, then normalise to a 1.8 m reference so tall and short people compare fairly. You'll need your body-fat % — use our body-fat calculator first.
Around 18 is average, 20–22 is well-trained, 22–24 is excellent and approaching the natural limit (~25).
It's very rare. Sustained values above ~25 almost always indicate performance-enhancing drugs — which we never recommend.
Normalising to 1.8 m height removes the bias that taller people score lower, so the number is comparable across heights.