I suppose I could look it up, but chatting is more fund - how does one work out ones body fat %ge?
The best way is with a DEXA scan (
http://en.wikipedia.org/wiki/Dual-energy_X-ray_absorptiometry), but I can't fit one of those in my garage and get the Volvo in.
So, for the layman at home - you have body fat scales, eg: Tanita - which are widely viewed as pretty rubbish for this purpose (and with good reason), manual calipers using one three or seven body sites (one - pretty inaccurate, three and seven - increasingly accurate; all require practice to get consistent results) and finally, the good old tape measure.
The scales are very susceptible to variations due to hydration, but if you use some over a period of time you get a "feel" for how they react to you, and you can get a reasonable estimation of bf%.
Calipers are pretty accurate once you get practiced, so you're consistent.
Tape measure is obvious. This doesn't give you a bf% of course, but it gives you an idea of changes in shape that are going on.