I'm confused. I took my measurements for my hips and abdomen and did all the calculations in The Zone book in appedix B and it calculated to 26% body fat. I just put in the same measurements into the online tool and it says 50% body fat. Thats significantly off. Which one should I go by?

Nevermind, I found out what I did wrong..I did these calculations 5 times last night and missed it but redid it this morning and caught it.