Power supplies

I'm getting into doing simple builds and was wondering is there an easy way to know how powerful a power supply should be for what your getting?

 

Much appreciated

There are several good psu calculators out there. I really like the one on the Asus website:

http://support.asus.com/powersupply.aspx

Awesome thanks logan!

Huge fan of the Beard btw!

We all are.