How to use the calculator
Click a card slot, then click a card in the grid to fill it. The first two slots are your hole cards and the other five are the board: three for the flop, then the turn, then the river. Leave the board empty for a pre-flop calculation.
- Pick your two cards.
- Add any community cards that are showing (the flop must be complete before you add the turn).
- Choose the number of opponents, from 1 to 8.
- Press Calculate odds. A progress bar fills while the simulation runs, and the result updates as it goes.
Cards you have already used are disabled so a card cannot appear twice. Click a filled slot again to remove its card.
Worked example
These figures come from exact enumeration, which tries every possible board instead of sampling, so they carry no sampling error. They are the same maths the simulation estimates:
Pre-flop, all 1,712,304 boards A♣ A♦ vs K♥ K♠ (no shared suits): aces 81.3%, kings 18.7% A♠ A♥ vs K♠ K♥ (suits shared): aces 82.6%, kings 17.4% Q♣ Q♦ vs A♥ K♠ (ace-king offsuit): queens 57.2% Q♣ Q♦ vs A♠ K♠ (ace-king suited): queens 53.8%
So aces against kings win roughly 82 times in 100, and a pair is only a slight favourite over two higher cards. Now a flop: you hold A♥ K♥ and the board is 7♥ 2♥ Q♠, so you have four hearts and need one more.
Chance a heart arrives on the turn or river: 35.0% = 1 - (38 x 37) / (47 x 46), with 9 hearts left among 47 unseen cards Chance it arrives on the next card only: 19.6% (9 of 46) Equity against one random hand: 72.6%
The last line is higher than the flush chance alone because ace-king high already wins some of the time without improving.
How the simulation works
The tool uses a Monte Carlo simulation. Each trial it removes your known cards from a 52-card deck, shuffles the rest, deals random two-card hands to your opponents and completes the board with random cards if it is not finished. Every player's best five-card hand is found from their seven cards, using the standard rankings from high card up to straight flush. The tool counts a trial as a win if you hold the strictly best hand, a tie if you share the best hand, and a loss otherwise.
Equity counts a tie as a fraction: if you split the pot two ways, that trial counts as one half. With 20,000 trials the 95% margin of error on a win percentage is at most about 0.7 percentage points (at 50%) and smaller for lopsided results, and the page shows the margin for your result. Run it again and the last digit will change slightly; that is normal for a simulation.
Reading the results and their limits
As a sanity check against the simulation, a pair of aces against one random hand wins about 85% of the time pre-flop, while ace-king suited wins about two thirds of the time. Adding opponents lowers your chances quickly: aces against eight random hands win about 35% of the time.
Remember what the number means. It describes your chances against random hands over many deals. Real opponents fold weak hands and bet strong ones, so their hands are not random, and the odds of one specific hand cannot be predicted. The calculator also does not model betting, pot odds, position or opponent tendencies. Use it to build intuition about hand strength, not to decide with certainty.
Responsible play. This is an odds tool, not gambling advice. Poker carries a real risk of losing money. Only play with money you can afford to lose, set limits in advance and take breaks. If gambling is causing you harm, free confidential support is available, for example the National Problem Gambling Helpline (1-800-GAMBLER in the US) or GamCare in the UK.
Hand rankings reference
From strongest to weakest: straight flush, four of a kind, full house, flush, straight, three of a kind, two pair, one pair and high card. When two players have the same category, the higher ranks decide, and then the kickers. In Texas Hold'em you make the best five-card hand from any of your two hole cards and the five board cards, so the board itself can be your hand and you can split the pot.
Among all 133,784,560 possible seven-card hands, the best five-card hand is: high card in 17.4%, one pair 43.8%, two pair 23.5%, three of a kind 4.8%, straight 4.6%, flush 3.0%, full house 2.6%, four of a kind 0.17% and straight flush 0.03%.
Frequently asked questions
Why do I get slightly different numbers each time?
The tool simulates random deals, so each run is a fresh sample. With 20,000 trials the win percentage varies by well under a point. The page shows the margin of error.
Does it assume my opponents hold random cards?
Yes. Each opponent receives two random cards. Real players choose hands, so real-world results will differ.
What is the difference between win percentage and equity?
Win percentage counts only outright wins. Equity also counts your share of split pots, so a two-way tie adds half a win.
Can I use it after the flop, turn or river?
Yes. Fill in the board cards that have been dealt, in order, and the simulation only deals the missing cards.
Is the hand evaluator accurate?
We counted the best hand in every one of the 133,784,560 seven-card combinations and the totals for each category match the standard published counts, including the ace-low straight. We also check the simulation against exact enumeration.
Is this gambling advice?
No. It is an educational probability tool. Poker involves risk, so only play with money you can afford to lose.