To figure the percentage of hitting your hand after the flop, you can use a very simple method of counting your “outs” (cards that will make your hand) and then multiplying it by 4 or 2, depending on whether you have one or two cards to come. This method will get you very close to your exact percentage, and close enough for any situation you’ll ever face. (Technically speaking, it may be off by a percent or two in a lot of situations, but that isn’t enough for you to worry about.)
As an example of this is, let’s say you’re dealt two suited cards (Kd and 3d)
The flop comes 10d-6d-9h
You’ve flopped a flush draw. To make your hand though, you need another diamond to come on either the “turn” (the fourth board card) or “river” (the fifth board card)…thus giving you two chances to hit a diamond. In a 52 card deck there are 13 diamonds. You have two in your hand, and there are two on the board, leaving 9 remaining diamond in the deck. The simple way to figure your odds for hitting a diamond is to take the nine remaining diamonds and multiply them by 4…giving you a 36% (precise percentage is 34.97%) chance of hitting your hand by the river. If a non diamond comes on the turn, you only have one more card in which to get a diamond..so you figure the odds by multiplying the 9 diamonds by 2, giving 18% (precise percentage is 19.6)
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