--- title: "ATs vs J9s: preflop equity" url: "https://georgelipoker.com/equity/ats-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/ats-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "ATs is a big favorite over J9s before the flop: 61.02% to 38.98% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ats-vs-jto.md", "https://georgelipoker.com/equity/ats-vs-t9s.md", "https://georgelipoker.com/equity/aqo-vs-j9s.md"] --- # ATs vs J9s: preflop equity ATs is a big favorite over J9s before the flop: 61.02% to 38.98% equity, counted exactly over every board, with the split by flop type and suit. In equity, ATs against J9s stands at 61.02% to 38.98%, a gap of 22.04 points. ## ATs against J9s: the numbers **Exact preflop results for ATs against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATs | 60.779 | 0.482 | 38.739 | 61.020 | | J9s | 38.739 | 0.482 | 60.779 | 38.980 | Here suited hands face each other, ATs on one side and J9s on the other. 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 0.48%: on those boards the pot is chopped and neither hand wins outright. Among the 169 starting hands, ATs is number 13 and J9s is number 55 by strength against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATs | 16,652,000 | 132,000 | 10,613,000 | | J9s | 10,613,000 | 132,000 | 16,652,000 | 16 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand. **ATs 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) | | --- | --- | --- | --- | --- | | ATs | 1.565 | 1.645 | 2.581 | 0.639 | | J9s | 0.639 | 2.581 | 1.645 | 1.565 | 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 The flop changes the picture. ATs does best on paired flops, at 64.45%, and worst on low rainbow flops (nine high or lower), at 57.96%. ATs stays ahead on all five textures. **ATs against J9s by flop texture, in percent** | Flop | Share of flops | ATs wins | Ties | J9s wins | ATs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 61.850 | 0.146 | 38.004 | 61.923 | | Rainbow, nine or lower | 7.042 | 57.614 | 0.689 | 41.697 | 57.958 | | Two-tone | 46.727 | 59.991 | 0.241 | 39.768 | 60.111 | | Monotone | 5.273 | 56.271 | 3.400 | 40.329 | 57.971 | | Paired | 17.091 | 64.133 | 0.624 | 35.243 | 64.445 | 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 The table below sets each hand against its own random-hand baseline: a change of -3.58 points for ATs, from 64.60%, and -16.68 for J9s, from 55.66%. **ATs 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 | | --- | --- | --- | --- | --- | | ATs, all flops | 61.020 | 64.602 | -3.582 | 0.94455 | | ATs, rainbow, ten or higher | 61.923 | 64.602 | -2.679 | 0.95853 | | ATs, rainbow, nine or lower | 57.958 | 64.602 | -6.644 | 0.89715 | | ATs, two-tone | 60.111 | 64.602 | -4.491 | 0.93048 | | ATs, monotone | 57.971 | 64.602 | -6.631 | 0.89736 | | ATs, paired | 64.445 | 64.602 | -0.157 | 0.99757 | | J9s, all flops | 38.980 | 55.662 | -16.682 | 0.70030 | | J9s, rainbow, ten or higher | 38.077 | 55.662 | -17.585 | 0.68408 | | J9s, rainbow, nine or lower | 42.042 | 55.662 | -13.620 | 0.75531 | | J9s, two-tone | 39.889 | 55.662 | -15.773 | 0.71663 | | J9s, monotone | 42.029 | 55.662 | -13.633 | 0.75508 | | J9s, paired | 35.555 | 55.662 | -20.107 | 0.63877 | ## Does a shared suit matter? Split by suits, the deals give ATs 63.29% when the hands overlap in a suit and 60.27% when they do not. ATs does better with a shared suit, by 3.02 points. **ATs against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATs wins | Ties | J9s wins | ATs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 63.007 | 0.557 | 36.436 | 63.286 | | No shared suit | 12 | 75.00 | 60.036 | 0.457 | 39.507 | 60.265 | ## How often this matchup comes up Counting specific cards, ATs against J9s appears in 16 of the 1,624,350 ordered heads-up deals (0.0010%), and in 32 when the seats are swapped too (0.0020%). ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, ATs' average share is $122.04 (a gain of $22.04) and J9s' is $77.96 (a loss of $22.04). Over a long run, 1,000 deals split into about 608 for ATs, 387 for J9s and 5 tied. ## The same matchup from the other side If you came looking for J9s against ATs, the numbers are the same with the hands swapped: 38.98% and 61.02%. ## Keep exploring Try AsTs against Jh9h in the calculator: the hands share no suit, and every card can be changed. The links after it are the closest matchups in the ranking. - [Open AsTs against Jh9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTs&p2=Jh9h) - [ATs combos](https://georgelipoker.com/combos/ats.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [ATs vs JTo](https://georgelipoker.com/equity/ats-vs-jto.md) - [ATs vs T9s](https://georgelipoker.com/equity/ats-vs-t9s.md) - [AQo vs J9s](https://georgelipoker.com/equity/aqo-vs-j9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 16 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATs vs JTo: preflop equity](https://georgelipoker.com/equity/ats-vs-jto.md) - [ATs vs T9s: preflop equity](https://georgelipoker.com/equity/ats-vs-t9s.md) - [AQo vs J9s: preflop equity](https://georgelipoker.com/equity/aqo-vs-j9s.md)