
Texas Holdem Easy Way to Calculate Your Odds (AFTER THE FLOP)!!
There is an easier way to estimate odds though. It's generally called the 24 Rule.
The way it works is :
 If you are trying to figure your chances with one card to come, you multiply the number of outs you have by 2.
 If you are trying to estimate your chance for the turn and river combined, you multiply your outs by 4.
The number won't be exact, but will serve as a rough estimation.
For example,
 After the flop, you have an openended straight.
What are your odds of making the straight?
Actualy odds are 31.45%.
If you used the 24 rule, you'd come up with 32% (4 x 8 outs). Because you have 2x8=16% of making the straight on the Turn, and 4x8=32% of making the straight on the Turn OR River.
 After the flop, you have a 4card flush.
What are your odds of making the flush?
You have 9 remaining suited cards you needs (outs).
Odds of making the flush on the Turn are 2x9outs=18%
Odds of making the flush on the River are 4x9outs=36%
