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I use this thumbrule to figure my odds of making my hand. I've never seen it posted, so if its redundant, I apologize in advance.
You have about 2X% chance of hitting where X is the number of outs you have. If there are two cards to come, the thumbrule is 4X%.
For example, for a flush draw with 9 outs you've got about an 18% chance of catching on the turn, and about 36% if you are staying to the end. Then I convert to odds by rounding which is about 4.5:1 (82%/18% is 4.55) and 1.7:1, respectively.
This isn't quite right, but it's quick, easy to remember and gives you the ability to figure your odds for multiple draws that end up with weird outs. In the above (11 outs), the thumbrule suggests you have a 22% chance of hitting, or about 3.5:1.
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