It's not,and once again stupid information is passed on the getbig board. for men over 6', researchers say that on an average build each inch will equal 10lbs. Now for a bodybuilder, all bets are off. Size, shape, bodyfat, etc. all come into play. There is no formula. Saying that a 5'6 160 lb guy is the "same" as a 5'10 200lb guy not only sounds dumb, it is dumb.