Which one of these is the correct one, or the one I should use? Estimate #1 based on height and weight Your "Ponderal Index" is 13.20 which gives an estimated body fat of 9.5% (11.9 pounds of fat) Estimate #2 based on waist size and weight Estimated body fat of 12.7% (15.8 pounds of fat) Estimate #1 based on height and weight Your "Ponderal Index" is 13.20 which gives an estimated body fat of 9.5% (11.9 pounds of fat) Estimate #2 based on waist size and weight Estimated body fat of 12.7% (15.8 pounds of fat) I put it twice, my bad.. I meant to put this: http://www.stevenscreek.com/goodies/pi.shtml