--- title: "A9s vs J9s: preflop equity" url: "https://georgelipoker.com/equity/a9s-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/a9s-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "A9s is a big favorite over J9s before the flop: 68.36% to 31.64% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9s-vs-jto.md", "https://georgelipoker.com/equity/a9s-vs-t9s.md", "https://georgelipoker.com/equity/ato-vs-j9s.md"] --- # A9s vs J9s: preflop equity A9s is a big favorite over J9s before the flop: 68.36% to 31.64% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, A9s takes 68.36% of the pot on average and J9s takes the other 31.64%. ## A9s against J9s: the numbers **Exact preflop results for A9s against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9s | 67.457 | 1.802 | 30.741 | 68.358 | | J9s | 30.741 | 1.802 | 67.457 | 31.642 | A9s meets J9s, and both are suited hands. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing. A lead of 36.72 points is large but not decisive: J9s still takes about 307 of every 1,000 deals. 1.80% of boards are ties, so the equity of each hand is its win rate plus half of that. Ranked by equity against a random hand, A9s is number 18 of the 169 starting hands and J9s is number 55. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A9s | 13,861,000 | 370,000 | 6,317,000 | | J9s | 6,317,000 | 370,000 | 13,861,000 | 12 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. **A9s 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) | | --- | --- | --- | --- | --- | | A9s | 2.160 | 1.482 | 3.253 | 0.463 | | J9s | 0.463 | 3.253 | 1.482 | 2.160 | 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 Across the five flop textures A9s' equity moves by 18.87 points, from 62.15% on monotone flops to 81.02% on low rainbow flops (nine high or lower). A9s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **A9s against J9s by flop texture, in percent** | Flop | Share of flops | A9s wins | Ties | J9s wins | A9s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 65.555 | 1.349 | 33.096 | 66.230 | | Rainbow, nine or lower | 6.314 | 79.475 | 3.099 | 17.426 | 81.024 | | Two-tone | 46.543 | 66.163 | 1.478 | 32.359 | 66.902 | | Monotone | 5.215 | 60.170 | 3.951 | 35.879 | 62.146 | | Paired | 17.333 | 71.444 | 2.196 | 26.360 | 72.542 | 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 A random hand would give A9s 62.78% and J9s 55.66%. Against each other the change is +5.58 points for A9s and -24.02 for J9s. **A9s 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 | | --- | --- | --- | --- | --- | | A9s, all flops | 68.358 | 62.781 | +5.577 | 1.08883 | | A9s, rainbow, ten or higher | 66.230 | 62.781 | +3.449 | 1.05494 | | A9s, rainbow, nine or lower | 81.024 | 62.781 | +18.243 | 1.29058 | | A9s, two-tone | 66.902 | 62.781 | +4.121 | 1.06564 | | A9s, monotone | 62.146 | 62.781 | -0.635 | 0.98989 | | A9s, paired | 72.542 | 62.781 | +9.761 | 1.15548 | | J9s, all flops | 31.642 | 55.662 | -24.020 | 0.56847 | | J9s, rainbow, ten or higher | 33.770 | 55.662 | -21.892 | 0.60670 | | J9s, rainbow, nine or lower | 18.976 | 55.662 | -36.686 | 0.34091 | | J9s, two-tone | 33.098 | 55.662 | -22.564 | 0.59462 | | J9s, monotone | 37.854 | 55.662 | -17.808 | 0.68007 | | J9s, paired | 27.458 | 55.662 | -28.204 | 0.49330 | ## Does a shared suit matter? Every legal deal of A9s against J9s leaves the hands with no suit in common, so the suit split does not apply here. **A9s against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9s wins | Ties | J9s wins | A9s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 67.457 | 1.802 | 30.741 | 68.358 | ## How often this matchup comes up Exactly 12 specific deals fit this matchup in one seat order, which is 0.0007% of 1,624,350; both orders together give 24, or 0.0015%. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says A9s gets $136.72 of it on average and J9s gets $63.28. A thousand deals look like this: A9s takes 675, J9s takes 307, 18 are ties. ## The same matchup from the other side Swap the hands and you get J9s with 31.64% against A9s with 68.36%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring Try As9s 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 As9s against Jh9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9s&p2=Jh9h) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [A9s vs JTo](https://georgelipoker.com/equity/a9s-vs-jto.md) - [A9s vs T9s](https://georgelipoker.com/equity/a9s-vs-t9s.md) - [ATo vs J9s](https://georgelipoker.com/equity/ato-vs-j9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Each figure is a complete count over boards. Take the 12 specific deals, group them by suit pattern, deal all 1,712,304 boards against each, and compare the two seven-card hands. Equity counts a tie as half a win; the flop rows use every one of a board's ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A9s vs JTo: preflop equity](https://georgelipoker.com/equity/a9s-vs-jto.md) - [A9s vs T9s: preflop equity](https://georgelipoker.com/equity/a9s-vs-t9s.md) - [ATo vs J9s: preflop equity](https://georgelipoker.com/equity/ato-vs-j9s.md)