How do you calculate par?

Answer 1

Par is determined by the course manager/ designer. A hole has it's par determined by how many shots it takes to get to the green, plus regulation 2 putts. There are some holes which can be par 3 or par 4 or par 5 depending on where the tees are.

Answer 2

First of all I am guessing that you mean pie, to calculate pie you must times the number by 3.14 although most scientific calculators have this pie button on them already.