--- title: "A9s vs KJs: preflop equity" url: "https://georgelipoker.com/equity/a9s-vs-kjs.md" canonical_url: "https://georgelipoker.com/equity/a9s-vs-kjs" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A9s or KJs? A9s leads 57.41% to 42.59% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9s-vs-a8s.md", "https://georgelipoker.com/equity/a9s-vs-kts.md", "https://georgelipoker.com/equity/ato-vs-kjs.md"] --- # A9s vs KJs: preflop equity Who is ahead, A9s or KJs? A9s leads 57.41% to 42.59% before the flop, counted exactly over every board, with the split by flop type and suit. In equity, A9s against KJs stands at 57.41% to 42.59%, a gap of 14.82 points. ## A9s against KJs: the numbers **Exact preflop results for A9s against KJs, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9s | 57.162 | 0.502 | 42.336 | 57.413 | | KJs | 42.336 | 0.502 | 57.162 | 42.587 | A9s and KJs are both suited hands. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. A 14.82 point lead is real, and KJs still takes about 423 of every 1,000 deals outright. About 0.50% of boards chop the pot, which is why equity sits slightly above the win figure for both hands. For context, A9s sits at number 18 of 169 starting hands and KJs at number 20 when each is run against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A9s | 15,661,000 | 138,000 | 11,599,000 | | KJs | 11,599,000 | 138,000 | 15,661,000 | The total is exact: 16 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **A9s against KJs 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 | 1.348 | 1.749 | 2.362 | 0.742 | | KJs | 0.742 | 2.362 | 1.749 | 1.348 | The final column gives the least the pot must offer for each unit called for a call to break even at this equity. ## Who is ahead on which flops If you know the kind of flop that came, the numbers shift: A9s holds 74.49% on low rainbow flops (nine high or lower) and 51.57% on rainbow flops topped by a ten or better. 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 KJs by flop texture, in percent** | Flop | Share of flops | A9s wins | Ties | KJs wins | A9s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 51.513 | 0.121 | 48.366 | 51.573 | | Rainbow, nine or lower | 7.042 | 74.035 | 0.916 | 25.049 | 74.493 | | Two-tone | 46.727 | 56.070 | 0.266 | 43.664 | 56.203 | | Monotone | 5.273 | 52.938 | 3.411 | 43.651 | 54.644 | | Paired | 17.091 | 62.389 | 0.612 | 36.999 | 62.695 | 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 How much does the opponent matter? Compared with its random-hand 62.78%, A9s changes by -5.37 points, and KJs, from 62.57%, by -19.98. **A9s and KJs 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 | 57.413 | 62.781 | -5.368 | 0.91450 | | A9s, rainbow, ten or higher | 51.573 | 62.781 | -11.208 | 0.82147 | | A9s, rainbow, nine or lower | 74.493 | 62.781 | +11.712 | 1.18655 | | A9s, two-tone | 56.203 | 62.781 | -6.578 | 0.89522 | | A9s, monotone | 54.644 | 62.781 | -8.137 | 0.87039 | | A9s, paired | 62.695 | 62.781 | -0.086 | 0.99863 | | KJs, all flops | 42.587 | 62.567 | -19.980 | 0.68066 | | KJs, rainbow, ten or higher | 48.427 | 62.567 | -14.140 | 0.77400 | | KJs, rainbow, nine or lower | 25.507 | 62.567 | -37.060 | 0.40767 | | KJs, two-tone | 43.797 | 62.567 | -18.770 | 0.70000 | | KJs, monotone | 45.356 | 62.567 | -17.211 | 0.72492 | | KJs, paired | 37.305 | 62.567 | -25.262 | 0.59624 | ## Does a shared suit matter? When the hands share a suit, A9s holds 59.38%; when they do not, it holds 56.76%. A9s does better with a shared suit, by 2.62 points. **A9s against KJs by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9s wins | Ties | KJs wins | A9s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 59.086 | 0.580 | 40.334 | 59.376 | | No shared suit | 12 | 75.00 | 56.521 | 0.476 | 43.003 | 56.759 | ## How often this matchup comes up This page stands for 16 specific-card matchups (0.0010% of 1,624,350 ordered deals), or 32 once you count the seats both ways (0.0020%). ## A worked example Put $100 each into a $200 pot and deal every board once: A9s averages $114.82 back, ahead of its $100 by $14.82, while KJs averages $85.18, short of its $100 by $14.82. Out of 1,000 deals you should see around 572 outright wins for A9s, 423 for KJs, and 5 split pots. ## The same matchup from the other side Swap the hands and you get KJs with 42.59% against A9s with 57.41%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring Open the calculator with As9s against KhJh 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 As9s against KhJh in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9s&p2=KhJh) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [KJs combos](https://georgelipoker.com/combos/kjs.md) - [A9s vs A8s](https://georgelipoker.com/equity/a9s-vs-a8s.md) - [A9s vs KTs](https://georgelipoker.com/equity/a9s-vs-kts.md) - [ATo vs KJs](https://georgelipoker.com/equity/ato-vs-kjs.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 16 specific A9s against KJs 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 - [A9s vs A8s: preflop equity](https://georgelipoker.com/equity/a9s-vs-a8s.md) - [A9s vs KTs: preflop equity](https://georgelipoker.com/equity/a9s-vs-kts.md) - [ATo vs KJs: preflop equity](https://georgelipoker.com/equity/ato-vs-kjs.md)