In poker, particularly Texas Hold’em, an “out” refers to the number of cards that remain in the deck that will complete your hand.
For example, if your pocket cards are the Jack and 10 of spades, and the community cards already on the table are the King and 4 of spades and the Queen of diamonds you know you need one more spade to make a flush. You must quickly figure out how many spades are left in the deck. Each suit has 13 cards; in this example there are already four same-suited cards on the table. That means there are still nine spades left in the deck or in the hands of your opponents. These remaining spades are the outs.
In the simplest terms, figuring how to work outs in a game of poker is a matter of basic mathematics. There are 52 cards in a standard deck. By the turn, six of those cards are known – the two pocket cards you have in-hand and the four community cards sitting on the table – leaving 46 cards in the deck. Going back to the example, the odds of hitting a spade on the turn are nine out of 46, or about 20 per cent. You can improve your odds by staying in the game to see the river card, but this could leave you open to be drawn out by an opponent who is betting to eliminate you.
To play outs effectively, figure your odds of hitting your best possible hand. If you are not pleased with the percentage it is best to fold and protect your bankroll.