--- title: "ATo vs J9s: preflop equity" url: "https://georgelipoker.com/equity/ato-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/ato-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, ATo or J9s? ATo leads 58.45% to 41.55% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ato-vs-jto.md", "https://georgelipoker.com/equity/ato-vs-t9s.md", "https://georgelipoker.com/equity/kjs-vs-j9s.md"] --- # ATo vs J9s: preflop equity Who is ahead, ATo or J9s? ATo leads 58.45% to 41.55% before the flop, counted exactly over every board, with the split by flop type and suit. The exact count puts ATo at 58.45% and J9s at 41.55% when the two hands see all five board cards. ## ATo against J9s: the numbers **Exact preflop results for ATo against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATo | 58.229 | 0.435 | 41.336 | 58.447 | | J9s | 41.336 | 0.435 | 58.229 | 41.553 | Here an offsuit hand (ATo) meets a suited hand (J9s). With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. That is a modest edge, the kind that shows up over many hands and is easy to miss in one. The tie share is 0.44%: on those boards the pot is chopped and neither hand wins outright. ATo ranks number 19 of 169 starting hands, and J9s ranks number 55, by equity against a random hand. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATo | 47,859,000 | 358,000 | 33,974,000 | | J9s | 33,974,000 | 358,000 | 47,859,000 | The board total is exact, 48 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **ATo against J9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | ATo | 1.407 | 1.717 | 2.419 | 0.711 | | J9s | 0.711 | 2.419 | 1.717 | 1.407 | 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 Across the five flop textures ATo's equity moves by 6.33 points, from 55.92% on monotone flops to 62.25% on paired flops. ATo stays ahead on all five textures. **ATo against J9s by flop texture, in percent** | Flop | Share of flops | ATo wins | Ties | J9s wins | ATo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 60.426 | 0.151 | 39.423 | 60.501 | | Rainbow, nine or lower | 7.042 | 55.669 | 0.712 | 43.619 | 56.025 | | Two-tone | 46.667 | 56.516 | 0.256 | 43.228 | 56.644 | | Monotone | 5.212 | 54.742 | 2.361 | 42.897 | 55.922 | | Paired | 17.091 | 61.942 | 0.624 | 37.434 | 62.254 | 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 Start from the random-hand figures, 62.72% for ATo and 55.66% for J9s. This opponent changes them by -4.27 and -14.11 points. **ATo and J9s 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 | | --- | --- | --- | --- | --- | | ATo, all flops | 58.447 | 62.722 | -4.275 | 0.93184 | | ATo, rainbow, ten or higher | 60.501 | 62.722 | -2.221 | 0.96459 | | ATo, rainbow, nine or lower | 56.025 | 62.722 | -6.697 | 0.89323 | | ATo, two-tone | 56.644 | 62.722 | -6.078 | 0.90310 | | ATo, monotone | 55.922 | 62.722 | -6.800 | 0.89159 | | ATo, paired | 62.254 | 62.722 | -0.468 | 0.99254 | | J9s, all flops | 41.553 | 55.662 | -14.109 | 0.74652 | | J9s, rainbow, ten or higher | 39.499 | 55.662 | -16.163 | 0.70962 | | J9s, rainbow, nine or lower | 43.975 | 55.662 | -11.687 | 0.79004 | | J9s, two-tone | 43.356 | 55.662 | -12.306 | 0.77892 | | J9s, monotone | 44.078 | 55.662 | -11.584 | 0.79189 | | J9s, paired | 37.746 | 55.662 | -17.916 | 0.67813 | ## Does a shared suit matter? Of the deals of this matchup, 24 share a suit (ATo at 58.95%) and 24 do not (57.94%). ATo does better with a shared suit, by 1.01 points. **ATo against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATo wins | Ties | J9s wins | ATo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 58.716 | 0.476 | 40.808 | 58.954 | | No shared suit | 24 | 50.00 | 57.742 | 0.395 | 41.863 | 57.940 | ## How often this matchup comes up Exactly 48 specific deals fit this matchup in one seat order, which is 0.0030% of 1,624,350; both orders together give 96, or 0.0059%. ## A worked example Try it with money: two players each put in $100 and the whole board runs out every possible way. ATo averages $116.90 from the $200, up $16.90; J9s averages $83.10, down $16.90. Run 1,000 deals and the tally comes out near 582 for ATo, 414 for J9s and 4 ties. ## The same matchup from the other side Swap the hands and you get J9s with 41.55% against ATo with 58.45%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring AsTh against Jd9d is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open AsTh against Jd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTh&p2=Jd9d) - [ATo combos](https://georgelipoker.com/combos/ato.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [ATo vs JTo](https://georgelipoker.com/equity/ato-vs-jto.md) - [ATo vs T9s](https://georgelipoker.com/equity/ato-vs-t9s.md) - [KJs vs J9s](https://georgelipoker.com/equity/kjs-vs-j9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 48 specific ATo against J9s deals meets all 1,712,304 boards, and the better five-card hand wins; a split pot is half a win each. The flop table reads each board under all ten of its three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATo vs JTo: preflop equity](https://georgelipoker.com/equity/ato-vs-jto.md) - [ATo vs T9s: preflop equity](https://georgelipoker.com/equity/ato-vs-t9s.md) - [KJs vs J9s: preflop equity](https://georgelipoker.com/equity/kjs-vs-j9s.md)