About the Pot Odds Calculator
This pot odds calculator answers the most common question at a poker table: is this call worth it? Enter the pot before your opponent bet, the size of the bet you face and the number of outs that would give you the best hand. It shows the pot odds as a ratio, the equity you need to break even, your exact chance of hitting from the flop or turn, and whether calling has positive expected value.
It is for Texas Hold’em players learning the maths of drawing hands — flush draws, straight draws, overcards — and for anyone checking the rule of 2 and 4 shortcut against the exact numbers. It also estimates the implied odds you would need: how much more you must win on later streets when you hit to make a marginal call profitable.
Outs assume every out is live and that the unseen cards are random (47 unseen on the flop, 46 on the turn). The “flop, see both cards” option is only fair when no more betting will happen, such as when you or your opponent is all-in; otherwise use the one-card figure and add implied odds.
With the default inputs, the equity needed to call is 25%. Change any value above to recalculate instantly.
How to use the pot odds calculator
- 1Enter the pot size before your opponent’s bet.
- 2Enter the amount you have to call.
- 3Count your outs (for example 9 for a flush draw) and enter them.
- 4Pick the street: turn, flop with one card, or flop all-in for two cards.
- 5Compare your chance to hit with the equity needed and read the verdict and EV.
Formula and method
When an opponent bets B into a pot of P, calling costs B and wins the pot plus the bet, P + B. Your call breaks even when your chance of winning equals B ÷ (P + B + B), the share of the final pot that you contributed. If your chance to hit is higher than that, calling has positive expected value on the direct odds alone.
The exact chance of hitting counts unseen cards: 52 minus your 2 hole cards minus the board leaves 47 on the flop and 46 on the turn. Seeing both turn and river, you miss only if both cards are blanks. The rule of 2 and 4 is a quick approximation: multiply outs by 2 for one card and by 4 for two cards. Implied odds solve for the extra chips you would need to win later, X, so that hit × (P + B + X) = (1 − hit) × B.
- P
- Pot before the opponent’s bet
- B
- Bet you must call
- outs
- Unseen cards that make your hand
- hit
- Probability of hitting at least one out
Worked examples
Flush draw on the turn facing a half-pot bet
Calling 50 to win 150 needs 50 ÷ 200 = 25% equity. A flush draw hits 9 of 46 unseen cards, 19.6%, so the call loses about 10.87 chips on average. You would need to win about 56 more chips on the river when you hit to break even.
Open-ended draw, all-in on the flop
Calling 40 to win 100 needs 40 ÷ 140 = 28.6%. With both cards to come, 8 outs hit 1 − (39 × 38) ÷ (47 × 46) = 31.5%, so the call is profitable by about 4 chips.
Gutshot on the flop facing a pot-sized bet
A pot-sized bet gives 2 : 1, requiring 33.3% equity. A gutshot hits only 4 of 47 cards on the turn (8.5%), so calling is a clear fold — it loses almost 60 chips per call on average.
Frequently asked questions
How do you calculate pot odds?+
Compare what you can win with what you must call. If the pot is 100 and the bet is 50, you call 50 to win 150, so the pot odds are 3 : 1 and you need to win at least 50 ÷ 200 = 25% of the time.
What is the rule of 2 and 4?+
A quick way to estimate equity from outs: multiply your outs by 4 on the flop when you will see both remaining cards, or by 2 when only one card is to come. It is close to exact for up to about 8–9 outs and overestimates larger draws.
How many outs does a flush draw have?+
Nine. There are 13 cards of each suit; with four of your suit between your hand and the board, 9 remain unseen. An open-ended straight draw has 8 outs and a gutshot has 4.
What are implied odds?+
Implied odds count the extra chips you expect to win on later streets when you hit. A call that is unprofitable on direct pot odds can become correct if you are likely to get paid off heavily when your draw completes.
Should I use the turn and river odds on the flop?+
Only when no more betting can happen, such as when someone is all-in. If you may face another bet on the turn, use the one-card chance (outs ÷ 47) for the current decision.