Quote Originally Posted by vegaas2
Well, one thing that has helped me is the 4 and 2 rule. After the flop multiply your outs by 4, after the turn multiply your outs by 2. This gives you the rough percentage of how often you will hit. So if I have 9 outs after the flop, x4 tells me I have a 36% chance to hit by the end.
It is not exact but very close, so gives you a good guideline.
The thing I need to memorize is percentages for starting hands improving on the flop.
This has helped me a lot too and it is accurate when you don't have too many outs. Where there are tons of outs then it is a little off. For example, if you are 4 to a flush and open eneded for a stright then you have 9+(8-2) or 15 outs. The 4-2 rule would say your chances are 60% for turn or river and 30% for river. The actual percentages from the http://www.flopturnriver.com/chart_pot_odds.html chart are 54.1 and 32.6