get some calipers and im sure tehres a javascript program out there some where that will do all the math for you i have a program that does it i just need the calipers, there pretty accurate, about 2000 times more accurate than those electrocal impotence tests, a billion things makes those things inaccurate. the only true 100% way to get it is to go to a docter and get a water displacement test done. they put you in a tub a measure how much water you displace, then after some math they get your bodyfat.