--- title: "AJo vs 55: preflop equity" url: "https://georgelipoker.com/equity/ajo-vs-55.md" canonical_url: "https://georgelipoker.com/equity/ajo-vs-55" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, AJo or 55? 55 leads 53.92% to 46.09% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajo-vs-qjs.md", "https://georgelipoker.com/equity/ajo-vs-k9s.md", "https://georgelipoker.com/equity/kqs-vs-55.md"] --- # AJo vs 55: preflop equity Who is ahead, AJo or 55? 55 leads 53.92% to 46.09% before the flop, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, 55 is ahead of AJo by 7.82 points of equity, 53.91% to 46.09%. ## AJo against 55: the numbers **Exact preflop results for AJo against 55, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJo | 45.870 | 0.429 | 53.701 | 46.085 | | 55 | 53.701 | 0.429 | 45.870 | 53.915 | AJo, an offsuit hand, plays 55, a pocket pair. One hand holds a pair and the other holds two cards that both outrank it, which keeps the equity closer than most people expect. That is a slim edge: neither hand is far ahead. Ties are part of the picture: 0.43% of boards end in a split pot, and each side counts that as half a win. The hand ranking puts AJo at 15 and 55 at 27 out of 169 starting hands. **Boards behind the percentages: 123,285,888 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AJo | 56,551,000 | 529,000 | 66,206,000 | | 55 | 66,206,000 | 529,000 | 56,551,000 | The board total is exact, 72 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **AJo 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) | | --- | --- | --- | --- | --- | | AJo | 0.855 | 2.180 | 1.862 | 1.170 | | 55 | 1.170 | 1.862 | 2.180 | 0.855 | The last column is the smallest pot odds, written as a pot-to-call ratio, at which a call breaks even with this equity. ## Who is ahead on which flops The flop changes the picture. 55 does best on low rainbow flops (nine high or lower), at 80.19%, and worst on rainbow flops topped by a ten or better, at 47.00%. The lead reverses on rainbow flops topped by a ten or better: there AJo is the favorite even though 55 is ahead overall. **AJo against 55 by flop texture, in percent** | Flop | Share of flops | AJo wins | Ties | 55 wins | AJo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.717 | 52.904 | 0.201 | 46.895 | 53.005 | | Rainbow, nine or lower | 6.314 | 19.412 | 0.790 | 79.798 | 19.807 | | Two-tone | 46.485 | 46.418 | 0.309 | 53.273 | 46.573 | | Monotone | 5.151 | 48.193 | 1.834 | 49.973 | 49.110 | | Paired | 17.333 | 43.316 | 0.528 | 56.156 | 43.580 | Read the flop types this way: rainbow has three suits, two-tone has two cards of one suit, monotone has three, and paired repeats a rank. ## Compared with a random hand The table below sets each hand against its own random-hand baseline: a change of -17.47 points for AJo, from 63.56%, and -6.42 for 55, from 60.33%. **AJo 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 | | --- | --- | --- | --- | --- | | AJo, all flops | 46.085 | 63.563 | -17.478 | 0.72503 | | AJo, rainbow, ten or higher | 53.005 | 63.563 | -10.558 | 0.83390 | | AJo, rainbow, nine or lower | 19.807 | 63.563 | -43.756 | 0.31161 | | AJo, two-tone | 46.573 | 63.563 | -16.990 | 0.73271 | | AJo, monotone | 49.110 | 63.563 | -14.453 | 0.77262 | | AJo, paired | 43.580 | 63.563 | -19.983 | 0.68562 | | 55, all flops | 53.915 | 60.325 | -6.410 | 0.89374 | | 55, rainbow, ten or higher | 46.995 | 60.325 | -13.330 | 0.77903 | | 55, rainbow, nine or lower | 80.193 | 60.325 | +19.868 | 1.32935 | | 55, two-tone | 53.427 | 60.325 | -6.898 | 0.88565 | | 55, monotone | 50.890 | 60.325 | -9.435 | 0.84360 | | 55, paired | 56.420 | 60.325 | -3.905 | 0.93527 | ## Does a shared suit matter? Suit overlap shows up in the numbers. With a suit in common 55 has 53.83% equity, and with none in common it has 54.32%. 55 does better with no shared suit, by 0.49 points. **AJo against 55 by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJo wins | Ties | 55 wins | AJo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 60 | 83.33 | 45.944 | 0.444 | 53.612 | 46.166 | | No shared suit | 12 | 16.67 | 45.499 | 0.356 | 54.145 | 45.677 | ## How often this matchup comes up Counting specific cards, AJo against 55 appears in 72 of the 1,624,350 ordered heads-up deals (0.0044%), and in 144 when the seats are swapped too (0.0089%). ## A worked example Say each player puts $100 in before the flop, making a $200 pot. On average 55 takes back $107.82 of it, which is $7.82 more than it put in, and AJo takes back $92.18, $7.82 less than it put in. In 1,000 deals of exactly this matchup, expect about 537 won outright by 55, about 459 won outright by AJo and about 4 split. ## The same matchup from the other side Read it from the other side: 55 against AJo is the same matchup with the numbers swapped, so 55 holds 53.91% and AJo holds 46.09%. That address sends you back to this page. ## Keep exploring Open the calculator with AsJh against 5d5c 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 AsJh against 5d5c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJh&p2=5d5c) - [AJo combos](https://georgelipoker.com/combos/ajo.md) - [55 combos](https://georgelipoker.com/combos/55.md) - [AJo vs QJs](https://georgelipoker.com/equity/ajo-vs-qjs.md) - [AJo vs K9s](https://georgelipoker.com/equity/ajo-vs-k9s.md) - [KQs vs 55](https://georgelipoker.com/equity/kqs-vs-55.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 72 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJo vs QJs: preflop equity](https://georgelipoker.com/equity/ajo-vs-qjs.md) - [AJo vs K9s: preflop equity](https://georgelipoker.com/equity/ajo-vs-k9s.md) - [KQs vs 55: preflop equity](https://georgelipoker.com/equity/kqs-vs-55.md)