You're on the flop and your hand isn't made yet. Maybe you have two clubs and the board has two clubs — one more and you'd have a flush. Maybe you have four cards in a row and a fifth would give you a straight. You're on a draw, and the first question to answer is: how many outs do you have?
Knowing how to count outs in poker is the foundation of every math-based decision in the game. Get the count right and you can estimate your winning chances in seconds. Get it wrong and every calculation after that is off.
What Is an Out?
An out is any card remaining in the deck that would improve your hand enough to likely make you the winner. The "likely" qualifier matters — more on that in the dirty outs section below.
The deck has 52 cards. You see 2 in your hand and 3 on the flop, so 47 cards remain unknown. Your outs live in those 47 cards.
Counting Outs for Common Draws
Flush Draw (9 Outs)
You hold two cards of the same suit and two more of that suit appear on the board. One more of that suit gives you a flush.
There are 13 cards of each suit in a full deck. You've seen 4 of them (2 in your hand, 2 on the board). That leaves 9 remaining.
Flush draw = 9 outs.
This is the most important number to memorize in poker math. On the flop with two cards still to come, 9 × 4 = 36% equity — a strong enough draw to call most reasonable bets.
Open-Ended Straight Draw (8 Outs)
You have four consecutive ranks in your hand and on the board, with both ends open. A card on either end completes your straight.
Example: You hold 8♠ 9♣ and the board shows 6♦ 7♥ K♠. Any 5 makes 5-6-7-8-9, and any T makes 6-7-8-9-T. There are four 5s and four Ts in the deck.
Open-ended straight draw = 8 outs.
On the flop, 8 × 4 = 32% equity. Nearly as strong as a flush draw.
Gutshot Straight Draw (4 Outs)
You have four cards to a straight, but the missing card is in the middle — only one rank can complete it.
Example: You hold 7♠ 9♣ and the board shows 5♦ 6♥ K♠. You need an 8 to make 5-6-7-8-9. There are four 8s in the deck.
Gutshot = 4 outs.
On the flop, 4 × 4 = 16% equity. A weak draw. You need very favorable pot odds to call, and that's rare.
Combo Draw (Up to 15 Outs)
Sometimes you have both a flush draw and a straight draw at the same time. These combo draws are very powerful.
Example: You hold 6♥ 7♥ and the board is 4♥ 5♣ J♥. You have:
- A flush draw: hearts seen are 6♥, 7♥, 4♥, J♥ — that's 4 of the 13 hearts, leaving 9 hearts in the deck.
- An open-ended straight draw: any 3 or any 8 completes 3-4-5-6-7 or 4-5-6-7-8 — that's 8 cards.
- Two of those straight cards are also hearts (3♥ and 8♥), so subtract 2 to avoid double-counting.
9 + 8 − 2 = 15 outs.
On the flop, 15 outs puts you at roughly 54% equity (the rule of 2 and 4 slightly overestimates here at 60%). You're actually a favorite to win the hand. Bet or raise — don't slow-play a draw this strong.
<!-- OUTS_CALCULATOR -->Not All Outs Count Equally: Dirty Outs
Here's where counting gets more nuanced. An out is supposed to be a card that makes you the winner — but some outs are "dirty," meaning they improve your hand while improving your opponent's hand even more. Counting dirty outs at full value is one of the most common mistakes beginners make.
Drawing to a Non-Nut Flush
If three spades are on the board and you hold K♠, you're drawing to a king-high flush. That usually wins. But if your opponent holds A♠, any spade you hit gives you a flush and gives them a better one.
Before counting flush outs, ask: if I complete my flush, could a higher flush beat me? If yes, those outs are dirty. The safest flush draws are to the ace-high flush — called the "nut flush." With A♠ in your hand and spades on the board, no flush can beat you.
4-Flush Boards
When three cards of one suit are on the board, anyone holding two of that suit already has a flush. If you're drawing to a straight and one of your completing cards is that suit, it might actually complete an opponent's flush instead of winning the pot for you.
Example: The board is K♠ Q♠ 9♠ 4♦. You hold J♣ T♦ for a gutshot straight draw — an ace gives you the Broadway straight A-K-Q-J-T. But if your opponent holds two spades, they already have a flush, and your ace-high straight loses. Your one out (A♠) is the only spade ace, but an off-suit ace still wins. In this case, you have 3 clean outs (A♥, A♦, A♣) and 1 dirty one (A♠).
On boards with three cards of the same suit, always check whether your outs complete an opponent's flush.
Paired Boards
On a board with a pair — like 9♦ 9♣ 5♥ — an opponent might already have a full house (for example, holding 9♠ 5♦ gives them 9-9-9-5-5). Your completed straight loses to a full house.
If you're drawing to a straight on a paired board and suspect your opponent has a full house, your straight outs are effectively dead. You might still have implied odds if they don't have a full house and you can extract value when you hit — but count carefully.
Overcards
If you hold A♦ K♣ and the board is J♠ 9♥ 4♦, hitting an ace or king gives you top pair. That's 3 remaining aces plus 3 remaining kings = 6 potential outs.
The problem: top pair might not win. If your opponent has two pair or a set, your one pair loses. Count overcards as partial outs. On a safe, uncoordinated board against a likely one-pair hand, they're reasonably reliable. Against a likely strong hand on a dangerous board, discount them heavily or ignore them.
Going From Outs to a Decision
Once you have a confident out count, convert it to equity with the rule of 2 and 4 — multiply by 4 on the flop, by 2 on the turn. Then compare that equity to your pot odds: call ÷ (pot + bet + call). If your equity is higher than the pot odds percentage, a call is mathematically correct.
The full pot odds workflow lives at /math/pot-odds.
Practice
Counting outs gets faster with repetition. The outs trainer at /math/outs gives you a random scenario, asks how many outs you have, and explains the correct answer.
Start with the clean draws: flush (9), open-ended straight (8), gutshot (4). Get those automatic. Then practice spotting dirty outs — boards that look like they help you but might not. That second skill is what separates players who understand equity from players who just learned the numbers.