FFMI is just (lbm in kg)/(height in meters)^2
In my case I'm 207ish lbs (94.1kg), 5'9 (175cm), and if I'm really lucky right now I'm in the 16-18% range, so let's say 17% BF. LBM = 78.1kg give or take.
So it'd be (78.1kg)/(1.75 * 1.75) = 25.5 FFMI
That is of course depending on my estimate of chunkiness, but it's been fairly consistent for me. It's a bit more useful since body comp is actually taken into account.
There's been some research done to normalize the scores among various populations, including European white-bread like myself, and there's also been an effort to correlate AAS usage by judging the FFMI, since it's apparently uncommon to see any scores above 24-25 in naturals.
Tee hee.
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