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Poker maths · 5 min

Counting outs

Estimating your chance of winning in seconds: count your outs, times two or four, done.

An out is a card that makes your hand the best one. Counting outs plus the rule of 2 and 4 gives you a chance of winning in seconds, and that chance is the other half of the pot odds sum: together they tell you whether calling makes money.

The four numbers worth memorising

Almost every spot lands on one of these four: 4 outs for a gutshot straight draw, 8 outs for an open-ended straight draw, 9 outs for a flush draw, and 15 outs for a combined flush and straight draw. Two loose high cards that could make top pair count as six, with a pinch of salt.

The rule of 2 and 4

On the flop, with two cards still to come: outs times four is your chance of winning as a percentage. On the turn, with one card left: outs times two. A flush draw on the flop is therefore roughly 36 percent, and 18 on the turn. The true numbers are a few percent off, but at the table fast and nearly right beats slow and exact every time.

The trap: tainted outs

Not every card that improves you also makes you the winner. The classic: you count eight outs for your straight, but two of them put a third card of one suit on the table and so make a flush possible. Honest counters discount those and arrive at six. That sounds fussy, until you realise this exact difference decides whether a borderline call wins or loses. Practise the estimate with the free equity trainer, and read how chance and price come together in what is equity.

frequently asked questions

Outs questions.

What exactly is an out? +

A card that makes your hand the best one, near enough. Hold four hearts and the nine remaining hearts are your outs. The skill is in counting honestly: a card that also improves your opponent’s hand does not count in full.

How does the rule of 2 and 4 work? +

Multiply your outs by 4 when two cards are still to come (flop to river), and by 2 when only one is left. Nine outs on the flop is therefore roughly a 36 percent chance of winning; on the turn about 18 percent. Not exact, but easily precise enough for the table.

Which out counts are worth memorising? +

Four for a gutshot straight draw, eight for an open-ended straight draw, nine for a flush draw, and fifteen when you hold both at once. Those four numbers plus the rule of 2 and 4 cover almost every spot.

Why do I sometimes count too many outs? +

Because not every improving card gives you the winning hand. If the card that completes your straight also puts a flush on the table for your opponent, count it as half or not at all. Discounting honestly is the difference between counting outs and talking yourself rich.

count along with real hands

From counting to recognising.

In Pokiq’s daily practice spots you count outs until you see them without counting. Free, with an explanation after every decision.

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