What are pot odds in poker?
Pot odds represent the ratio between the bet you have to pay to stay in the hand and the total pot you'd win if you call. They express the minimum equity you need for the call to be profitable in the long run.
Formula: Pot Odds = Bet / (Current pot + Bet)
The pot is at 100 BB. The opponent bets 50 BB. Your pot odds = 50 / (100 + 50) = 33% — you need at least 33% equity to call.
The rule of 2 and 4 to estimate your outs
At the table, you can't run a Monte Carlo simulation in real time. The rule of 2 and 4 lets you quickly estimate your equity from your number of outs:
The most common outs
| Situation | Outs | Flop equity | Turn equity |
|---|---|---|---|
| Flush draw (4 suited) | 9 | ~36% | ~18% |
| Open-ended straight draw | 8 | ~32% | ~16% |
| Gutshot (inside straight) | 4 | ~16% | ~8% |
| Overcard (higher pair) | 6 | ~24% | ~12% |
| Flush draw + straight draw | 15 | ~54% | ~30% |
Pot odds vs Implied odds: the difference
Pot odds are purely mathematical: they compare what you pay now to what the pot holds now. But they don't account for what you could win on later streets if you hit your hand.
That's where implied odds come in: the future potential value. A straight draw can be a negative call on pot odds but very profitable on implied odds if the opponent has a deep stack and will pay you off big when you hit. Conversely, implied odds are low if the board is dangerous and the opponent will be wary.
Frequently asked questions
Should I always call if my pot odds are good enough?
In pure theory, yes — a call is profitable as soon as your real equity exceeds the required equity. In practice, you also have to consider implied odds (future gains), reverse implied odds (future losses if you hit but the opponent has better), and your position. The calculator gives the mathematical basis; the context of the hand refines the decision.
How do you count your outs efficiently?
Identify the cards that make your hand the best. Flush draw = 9 outs (13 cards of the suit - 4 already visible). Open-ended straight draw = 8 outs. Subtract the outs that could also improve the opponent ("discounted outs") so you don't overestimate your equity.
Do pot odds apply in tournaments?
Pot odds in chips work the same way, but in a tournament (MTT, SNG), the real value of chips isn't linear (ICM). A +EV call in chips can be -EV in tournament-value terms depending on blind pressure, the bubble or the prize structure.