Thanks, Goldie. I snuck in here (am a guy) to ask on behalf of my girlfriend. Our calipers just arrived and in the booklet I just read about what looks like the basis for Scooby's online calculator, developed by Jackson and Pollock. The three sites to measure are different for women, as are the calculations. And yes, I understand that this is far from being truly accurate. But if taken regularly, in the same manner, at the very least one can observe the progression, I think.
Anyway, in googling the keywords
Jackson Pollock bodyfat and calculator I came up with a site that has the online version for both men and women. I checked my own readings and they were the same as the one Scooby has used, so I assume its the same javascript. Anyway, here it is (about a third of the way down the page):
http://www.bodybuilding.com/fun/drobson98.htm