This is generally what goes on in MY mind...
(flop) multiply your outs by 4, then subtract 1 for every out after 8 outs. IE a flush draw generally has 9 outs. 9x4=36, minus the 1 out over 8 = 35.
(turn) cards that make your hand divided by cards that don't.
So for example an OESD has 8 outs divided by 47 unseen cards = approximately 1/6 chance to hit.
