Apparently it is some pretty simple calculus, anyone doing maths at uni should be able to tell you. Basically pi is the ratio between the diameter of a circle and it's circumference. So divide the circumference by the diameter and you have pi. And there are various mathematical ways of doing that accurately, which I'm not quite sure of. Anyway, you boys have obviously never heard of Super-Pi, my computer can work out Pi to 1 million places in 42 seconds. I'm cool, usually