--- title: "AJs vs K9s: preflop equity" url: "https://georgelipoker.com/equity/ajs-vs-k9s.md" canonical_url: "https://georgelipoker.com/equity/ajs-vs-k9s" last_updated: "2026-10-23" type: "reference" summary: "AJs is a big favorite over K9s before the flop: 62.97% to 37.03% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajs-vs-a5s.md", "https://georgelipoker.com/equity/ajs-vs-a6s.md", "https://georgelipoker.com/equity/ako-vs-k9s.md"] --- # AJs vs K9s: preflop equity AJs is a big favorite over K9s before the flop: 62.97% to 37.03% equity, counted exactly over every board, with the split by flop type and suit. If AJs and K9s get all the chips in before the flop, AJs owns 62.97% of the pot in the long run and K9s owns 37.03%. ## AJs against K9s: the numbers **Exact preflop results for AJs against K9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJs | 62.715 | 0.502 | 36.783 | 62.966 | | K9s | 36.783 | 0.502 | 62.715 | 37.034 | AJs meets K9s, and both are suited hands. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. AJs is ahead, but K9s is far from dead: it takes 368 of every 1,000 deals outright. Ties are 0.50% of the outcomes here; each tied board gives both hands half the pot. Among the 169 starting hands, AJs is number 11 and K9s is number 29 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 | | --- | --- | --- | --- | | AJs | 17,182,000 | 138,000 | 10,077,000 | | K9s | 10,077,000 | 138,000 | 17,182,000 | Exact total: 16 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. **AJs against K9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | AJs | 1.700 | 1.595 | 2.719 | 0.588 | | K9s | 0.588 | 2.719 | 1.595 | 1.700 | 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 Break the boards down by their first three cards and AJs is strongest on paired flops (65.66%) and weakest on low rainbow flops (nine high or lower) (58.48%). AJs stays ahead on all five textures. **AJs against K9s by flop texture, in percent** | Flop | Share of flops | AJs wins | Ties | K9s wins | AJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 64.639 | 0.121 | 35.240 | 64.700 | | Rainbow, nine or lower | 7.042 | 58.018 | 0.916 | 41.066 | 58.476 | | Two-tone | 46.727 | 62.020 | 0.266 | 37.714 | 62.153 | | Monotone | 5.273 | 57.887 | 3.411 | 38.702 | 59.593 | | Paired | 17.091 | 65.350 | 0.612 | 34.038 | 65.656 | Read the flop types this way: rainbow has three suits, two-tone has two cards of one suit, monotone has three, and paired repeats a rank. ## Compared with a random hand How much does the opponent matter? Compared with its random-hand 65.39%, AJs changes by -2.42 points, and K9s, from 59.99%, by -22.96. **AJs and K9s 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 | | --- | --- | --- | --- | --- | | AJs, all flops | 62.966 | 65.393 | -2.427 | 0.96289 | | AJs, rainbow, ten or higher | 64.700 | 65.393 | -0.693 | 0.98940 | | AJs, rainbow, nine or lower | 58.476 | 65.393 | -6.917 | 0.89422 | | AJs, two-tone | 62.153 | 65.393 | -3.240 | 0.95045 | | AJs, monotone | 59.593 | 65.393 | -5.800 | 0.91131 | | AJs, paired | 65.656 | 65.393 | +0.263 | 1.00402 | | K9s, all flops | 37.034 | 59.988 | -22.954 | 0.61736 | | K9s, rainbow, ten or higher | 35.300 | 59.988 | -24.688 | 0.58845 | | K9s, rainbow, nine or lower | 41.524 | 59.988 | -18.464 | 0.69221 | | K9s, two-tone | 37.847 | 59.988 | -22.141 | 0.63091 | | K9s, monotone | 40.407 | 59.988 | -19.581 | 0.67358 | | K9s, paired | 34.344 | 59.988 | -25.644 | 0.57251 | ## Does a shared suit matter? Suit overlap shows up in the numbers. With a suit in common AJs has 65.42% equity, and with none in common it has 62.15%. AJs does better with a shared suit, by 3.27 points. **AJs against K9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJs wins | Ties | K9s wins | AJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 65.125 | 0.580 | 34.295 | 65.415 | | No shared suit | 12 | 75.00 | 61.911 | 0.476 | 37.613 | 62.149 | ## How often this matchup comes up Counting specific cards, AJs against K9s 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 Take a $200 pot built from $100 each. AJs' equity of 62.97% is worth $125.94, a $25.94 edge, and K9s' 37.03% is worth $74.06, which is $25.94 under its stake. A thousand deals look like this: AJs takes 627, K9s takes 368, 5 are ties. ## The same matchup from the other side If you came looking for K9s against AJs, the numbers are the same with the hands swapped: 37.03% and 62.97%. ## Keep exploring Try AsJs against Kh9h 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 AsJs against Kh9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJs&p2=Kh9h) - [AJs combos](https://georgelipoker.com/combos/ajs.md) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [AJs vs A5s](https://georgelipoker.com/equity/ajs-vs-a5s.md) - [AJs vs A6s](https://georgelipoker.com/equity/ajs-vs-a6s.md) - [AKo vs K9s](https://georgelipoker.com/equity/ako-vs-k9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 16 ways to deal one AJs and one K9s without reusing a card, grouped by suit pattern, every one of the 1,712,304 possible boards is dealt and both seven-card hands are compared. A tie counts as half a win in the equity column, and each board is counted once under each of its ten three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJs vs A5s: preflop equity](https://georgelipoker.com/equity/ajs-vs-a5s.md) - [AJs vs A6s: preflop equity](https://georgelipoker.com/equity/ajs-vs-a6s.md) - [AKo vs K9s: preflop equity](https://georgelipoker.com/equity/ako-vs-k9s.md)