Win percentage against opponent

I need some explanation as how to figure your win percentage against your opponents potential hand and thier number of outs. When you refer your percent of hitting your out to your opponents potential outs how do you do the math to figure your win perctage? Thanks to all who help.

A simple way of getting a ballpark figure is multiplying the number of outs after the flop by 4 to get a rough % to win. Say if someone has 8 outs, their win% after the flop is ~32%. It's not exact (in this case it's actually 31.5%), but it's not far off. For detailed charts which show exact win %s for different numbers of outs, just google "poker outs chart" or something.