you crack me up, rust.

I don't know the answer, but ran across BF computation formulae the other day by doing an internet search for "body fat formula"

What I found were formulae that had me anywhere from 19 - 34%, based on the same measurements. That's helpful, I thought. I'm either morbidly obese or starving to death! Luckily, had the BF tested at the gym, so I know it...but it was instructive to see how inaccurate the measuring systems are.