OddsCalc

Poker Odds Calculator

How often does that draw actually get there?

Number of Outs

Cards left in the deck that complete your hand.

Cards to Come

Chance to Hit

35%

For entertainment and informational purposes only.

Odds Against: 1.86 : 1
Rule-of-Thumb Estimate: ~36%

What you entered

Outs: 9Cards to come: 2

1
Cards you cannot use
47 - 9= 38
2
Probability of missing both cards
(38/47) x (37/46)= 0.6503
3
Probability of hitting by the river
1 - 0.6503= 34.9676%
4
Compare with the rule of 4
9 x 4= ~36%
5
Odds against hitting
(1 - 0.3497) / 0.3497= 1.8598 : 1

Result

Chance to Hit: 35%

With 9 outs you complete your hand about 35% of the time, so you need roughly 1.9-to-1 pot odds to call profitably.

Chance of completing a draw by outs

After the flop there are 47 unseen cards. Your outs are the cards that complete your hand; the calculator works out the chance of hitting one.

Draw	Outs	By the river (2 cards)	Next card only	Rule of 4 estimate
Gutshot straight	4	16.47%	8.51%	16%
Open-ended straight	8	31.45%	17.02%	32%
Flush draw	9	34.97%	19.15%	36%
Flush + gutshot	12	44.96%	25.53%	48%
Flush + open-ended	15	54.12%	31.91%	60%

The rule of 4 (outs times 4 for two cards) is accurate to within a point up to about 8 outs, then drifts high: at 15 outs it overstates the real 54% as 60%. Use outs times 2 for a single card, which stays accurate throughout. Gambling odds always favour the house over time. Treat any stake as money spent on entertainment, and never as an expected return.

The rule of 4 and 2

With two cards to come, multiplying your outs by 4 approximates your percentage; with one card left, multiply by 2. A nine-out flush draw gives roughly 36% by the river against a true 35% — close enough to use at the table and quick enough to do in your head.

Odds only matter next to pot odds

Knowing you will hit 20% of the time says nothing about whether to call. Compare it to the price: if the pot lays you 4-to-1 and you are 4-to-1 against, you break even. Anything better is a call, anything worse is a fold.

Frequently asked questions

I have a flush draw on the flop with 9 outs — should I call a pot-sized bet?

A pot-sized bet gives you 2:1 odds (you need to win 33% of the time). With 9 outs and two cards to come, your chance is about 35% — it's a marginal call that's slightly profitable. With one card to come, you'd hit only 19.6%, making it a clear fold.

How is the poker odds calculator different from the roulette odds calculator?

Poker odds change with every card dealt — your outs decrease as the deck shrinks, and other players' cards matter. Roulette odds are fixed and independent — every spin has the same probabilities regardless of previous results.

What are 'outs' in poker?

Outs are the unseen cards that would complete your hand. For example, a flush draw has 9 outs (13 suited cards minus the 4 you can already see). An open-ended straight draw has 8 outs, and a gut-shot has 4.

Does the rule of 4 and 2 always work?

It's accurate enough for most situations. The approximation gets slightly less precise above 12 outs — with 15 outs, the rule of 4 gives 60% but the true probability is about 54%. For everyday play decisions, it's close enough.