bodyfat formula using calipers

[power up]

I have a set of bodyfat calipers what is the formula to determine % I use this site http://www.linear-software.com/online.html but I want to know how they get their answer. It is not add em and divide by number of entries..

 

[vin01]

Check out this link. Pretty extensive info on measuring with calipers.

http://www.abcbodybuilding.com/magazine/ultimatebodyfattestingguide.htm