Outs after the flop Part II

[Tom1975]

Sounds like you're looking for something like the rule of four, which is very easy to use, though not deadly accurate. If you know your number of outs and there are two cards to come, multiple your number of outs by four to get the percent of hitting. This works nicely for your flush draw example, e.g. 9 * 4 = 36%. If you have only one card to come, multiple by two instead of four.