--- title: "AJs vs 55: preflop equity" url: "https://georgelipoker.com/equity/ajs-vs-55.md" canonical_url: "https://georgelipoker.com/equity/ajs-vs-55" last_updated: "2026-10-23" type: "reference" summary: "AJs vs 55 is close to a coin flip before the flop: 48.68% to 51.32% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajs-vs-qjs.md", "https://georgelipoker.com/equity/ajs-vs-k9s.md", "https://georgelipoker.com/equity/ako-vs-55.md"] --- # AJs vs 55: preflop equity AJs vs 55 is close to a coin flip before the flop: 48.68% to 51.32% equity, counted exactly over every board, with the split by flop type and suit. Counting every board, the equity split is 51.32% for 55 and 48.68% for AJs, so 55 leads by 2.64 points. ## AJs against 55: the numbers **Exact preflop results for AJs against 55, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJs | 48.449 | 0.456 | 51.095 | 48.677 | | 55 | 51.095 | 0.456 | 48.449 | 51.323 | AJs is a suited hand and 55 is a pocket pair. This is a pair against two overcards, a matchup that stays close because the other hand only needs one of its ranks to appear. 55 leads by less than 3 points of equity, so the result of any one deal is close to a toss-up. Ties are part of the picture: 0.46% of boards end in a split pot, and each side counts that as half a win. Among the 169 starting hands, AJs is number 11 and 55 is number 27 by strength against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AJs | 19,910,000 | 187,000 | 20,998,000 | | 55 | 20,998,000 | 187,000 | 19,910,000 | The board total is exact, 24 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **AJs against 55 read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | AJs | 0.948 | 2.064 | 1.957 | 1.054 | | 55 | 1.054 | 1.957 | 2.064 | 0.948 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops Break the boards down by their first three cards and 55 is strongest on low rainbow flops (nine high or lower) (77.51%) and weakest on rainbow flops topped by a ten or better (45.54%). AJs takes over on rainbow flops topped by a ten or better and two-tone flops, so the favorite before the flop is the underdog on those boards. **AJs against 55 by flop texture, in percent** | Flop | Share of flops | AJs wins | Ties | 55 wins | AJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 54.359 | 0.195 | 45.446 | 54.457 | | Rainbow, nine or lower | 6.314 | 22.107 | 0.757 | 77.136 | 22.486 | | Two-tone | 46.545 | 49.996 | 0.288 | 49.716 | 50.140 | | Monotone | 5.212 | 47.728 | 2.590 | 49.682 | 49.023 | | Paired | 17.334 | 45.717 | 0.528 | 53.755 | 45.981 | Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank. ## Compared with a random hand Compared with a random opponent, this matchup shifts AJs from 65.39% by -16.71 points and 55 from 60.33% by -9.01 points. **AJs and 55 here compared with each against a random hand, in percent** | Case | Equity here | Against a random hand | Change in points | Times the random-hand equity | | --- | --- | --- | --- | --- | | AJs, all flops | 48.677 | 65.393 | -16.716 | 0.74438 | | AJs, rainbow, ten or higher | 54.457 | 65.393 | -10.936 | 0.83276 | | AJs, rainbow, nine or lower | 22.486 | 65.393 | -42.907 | 0.34386 | | AJs, two-tone | 50.140 | 65.393 | -15.253 | 0.76675 | | AJs, monotone | 49.023 | 65.393 | -16.370 | 0.74967 | | AJs, paired | 45.981 | 65.393 | -19.412 | 0.70315 | | 55, all flops | 51.323 | 60.325 | -9.002 | 0.85077 | | 55, rainbow, ten or higher | 45.543 | 60.325 | -14.782 | 0.75496 | | 55, rainbow, nine or lower | 77.514 | 60.325 | +17.189 | 1.28494 | | 55, two-tone | 49.860 | 60.325 | -10.465 | 0.82652 | | 55, monotone | 50.977 | 60.325 | -9.348 | 0.84504 | | 55, paired | 54.019 | 60.325 | -6.306 | 0.89547 | ## Does a shared suit matter? When the hands share a suit, 55 holds 51.50%; when they do not, it holds 51.15%. 55 does better with a shared suit, by 0.35 points. **AJs against 55 by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJs wins | Ties | 55 wins | AJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 48.249 | 0.499 | 51.252 | 48.498 | | No shared suit | 12 | 50.00 | 48.648 | 0.414 | 50.938 | 48.855 | ## How often this matchup comes up How often does it happen? 24 of the 1,624,350 ordered deals (0.0015%) are AJs against 55, and 48 (0.0030%) if either hand may sit in either seat. ## A worked example With $100 from each side, the $200 pot is split on average as $102.64 for 55 and $97.36 for AJs; the first side gains $2.64 per all-in and the second gives up $2.64. Scaled to 1,000 deals, that is roughly 511 wins for 55, 484 for AJs and 5 chopped pots. ## The same matchup from the other side The mirror image, 55 against AJs, is 51.32% to 48.68%, and its address redirects to this page. ## Keep exploring Open the calculator with AsJs against 5h5d already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking. - [Open AsJs against 5h5d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJs&p2=5h5d) - [AJs combos](https://georgelipoker.com/combos/ajs.md) - [55 combos](https://georgelipoker.com/combos/55.md) - [AJs vs QJs](https://georgelipoker.com/equity/ajs-vs-qjs.md) - [AJs vs K9s](https://georgelipoker.com/equity/ajs-vs-k9s.md) - [AKo vs 55](https://georgelipoker.com/equity/ako-vs-55.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 24 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJs vs QJs: preflop equity](https://georgelipoker.com/equity/ajs-vs-qjs.md) - [AJs vs K9s: preflop equity](https://georgelipoker.com/equity/ajs-vs-k9s.md) - [AKo vs 55: preflop equity](https://georgelipoker.com/equity/ako-vs-55.md)