--- title: "KJs vs A9o: preflop equity" url: "https://georgelipoker.com/equity/kjs-vs-a9o.md" canonical_url: "https://georgelipoker.com/equity/kjs-vs-a9o" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KJs or A9o? A9o leads 54.70% to 45.30% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kjs-vs-kjo.md", "https://georgelipoker.com/equity/kjs-vs-55.md", "https://georgelipoker.com/equity/a8s-vs-a9o.md"] --- # KJs vs A9o: preflop equity Who is ahead, KJs or A9o? A9o leads 54.70% to 45.30% before the flop, counted exactly over every board, with the split by flop type and suit. The exact count puts A9o at 54.70% and KJs at 45.30% when the two hands see all five board cards. ## KJs against A9o: the numbers **Exact preflop results for KJs against A9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KJs | 45.075 | 0.456 | 54.469 | 45.303 | | A9o | 54.469 | 0.456 | 45.075 | 54.697 | The matchup pits a suited hand against an offsuit hand. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. With only 9.40 points between them, the board decides this matchup far more than the cards in hand. A split pot comes up on 0.46% of boards, so the wins and the equity differ by half of that. In the ranking of all 169 starting hands, KJs is number 20 and A9o is number 25. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KJs | 37,047,000 | 375,000 | 44,768,000 | | A9o | 44,768,000 | 375,000 | 37,047,000 | Exact total: 48 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **KJs against A9o read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | KJs | 0.828 | 2.219 | 1.836 | 1.207 | | A9o | 1.207 | 1.836 | 2.219 | 0.828 | In the last column, a pot-to-call ratio at or above the figure makes a call break even or better at this equity. ## Who is ahead on which flops The flop changes the picture. A9o does best on low rainbow flops (nine high or lower), at 73.06%, and worst on rainbow flops topped by a ten or better, at 49.93%. The overall edge for A9o hides rainbow flops topped by a ten or better, where KJs comes out in front. **KJs against A9o by flop texture, in percent** | Flop | Share of flops | KJs wins | Ties | A9o wins | KJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 50.012 | 0.124 | 49.864 | 50.074 | | Rainbow, nine or lower | 7.042 | 26.473 | 0.944 | 72.583 | 26.945 | | Two-tone | 46.667 | 47.355 | 0.282 | 52.363 | 47.496 | | Monotone | 5.212 | 46.163 | 2.375 | 51.462 | 47.351 | | Paired | 17.091 | 39.251 | 0.612 | 60.137 | 39.557 | 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, 62.57% for KJs and 60.77% for A9o. This opponent changes them by -17.27 and -6.07 points. **KJs and A9o 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 | | --- | --- | --- | --- | --- | | KJs, all flops | 45.303 | 62.567 | -17.264 | 0.72407 | | KJs, rainbow, ten or higher | 50.074 | 62.567 | -12.493 | 0.80033 | | KJs, rainbow, nine or lower | 26.945 | 62.567 | -35.622 | 0.43066 | | KJs, two-tone | 47.496 | 62.567 | -15.071 | 0.75912 | | KJs, monotone | 47.351 | 62.567 | -15.216 | 0.75680 | | KJs, paired | 39.557 | 62.567 | -23.010 | 0.63223 | | A9o, all flops | 54.697 | 60.773 | -6.076 | 0.90002 | | A9o, rainbow, ten or higher | 49.926 | 60.773 | -10.847 | 0.82152 | | A9o, rainbow, nine or lower | 73.055 | 60.773 | +12.282 | 1.20210 | | A9o, two-tone | 52.504 | 60.773 | -8.269 | 0.86394 | | A9o, monotone | 52.649 | 60.773 | -8.124 | 0.86632 | | A9o, paired | 60.443 | 60.773 | -0.330 | 0.99457 | ## Does a shared suit matter? Does suit overlap move the numbers? A9o has 55.17% when the hands share a suit and 54.23% when they do not. A9o does better with a shared suit, by 0.94 points. **KJs against A9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | KJs wins | Ties | A9o wins | KJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 44.585 | 0.497 | 54.918 | 44.833 | | No shared suit | 24 | 50.00 | 45.564 | 0.415 | 54.021 | 45.772 | ## How often this matchup comes up How often does it happen? 48 of the 1,624,350 ordered deals (0.0030%) are KJs against A9o, and 96 (0.0059%) if either hand may sit in either seat. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, A9o's average share is $109.40 (a gain of $9.40) and KJs' is $90.60 (a loss of $9.40). Over a long run, 1,000 deals split into about 545 for A9o, 451 for KJs and 4 tied. ## The same matchup from the other side Read it from the other side: A9o against KJs is the same matchup with the numbers swapped, so A9o holds 54.70% and KJs holds 45.30%. That address sends you back to this page. ## Keep exploring Try KsJs against Ah9d 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 KsJs against Ah9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsJs&p2=Ah9d) - [KJs combos](https://georgelipoker.com/combos/kjs.md) - [A9o combos](https://georgelipoker.com/combos/a9o.md) - [KJs vs KJo](https://georgelipoker.com/equity/kjs-vs-kjo.md) - [KJs vs 55](https://georgelipoker.com/equity/kjs-vs-55.md) - [A8s vs A9o](https://georgelipoker.com/equity/a8s-vs-a9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 48 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 - [KJs vs KJo: preflop equity](https://georgelipoker.com/equity/kjs-vs-kjo.md) - [KJs vs 55: preflop equity](https://georgelipoker.com/equity/kjs-vs-55.md) - [A8s vs A9o: preflop equity](https://georgelipoker.com/equity/a8s-vs-a9o.md)