Php calculations in VB forum?

[aceofspades]

Hey,

Im hoping to make some small calculations for each user in their postbit. I know the equation i want but i dont know much about PHP. Is php able to do things like square root a value? If its only having to perform a fairly simple calculation like:

Ans = sqrt ( X x Y) / 10

Will it slow the forum down, i mean how long will the server take to do the maths about 15 times, for 15 peoples postbits. Are we talking 10ths of a second, 100ths of a second 100ths of a second...?

Thanks for any help you can give.

James