--- title: "AJs vs K9o: preflop equity" url: "https://georgelipoker.com/equity/ajs-vs-k9o.md" canonical_url: "https://georgelipoker.com/equity/ajs-vs-k9o" last_updated: "2026-10-23" type: "reference" summary: "AJs is a big favorite over K9o before the flop: 65.92% to 34.08% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajs-vs-q9s.md", "https://georgelipoker.com/equity/ajs-vs-jts.md", "https://georgelipoker.com/equity/ako-vs-k9o.md"] --- # AJs vs K9o: preflop equity AJs is a big favorite over K9o before the flop: 65.92% to 34.08% equity, counted exactly over every board, with the split by flop type and suit. The exact count puts AJs at 65.92% and K9o at 34.08% when the two hands see all five board cards. ## AJs against K9o: the numbers **Exact preflop results for AJs against K9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJs | 65.690 | 0.458 | 33.852 | 65.919 | | K9o | 33.852 | 0.458 | 65.690 | 34.081 | The first hand is a suited hand; the second is an offsuit hand. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. A lead of 31.84 points is large but not decisive: K9o still takes about 338 of every 1,000 deals. The tie share is 0.46%: on those boards the pot is chopped and neither hand wins outright. Ranked by equity against a random hand, AJs is number 11 of the 169 starting hands and K9o is number 40. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AJs | 53,991,000 | 376,000 | 27,823,000 | | K9o | 27,823,000 | 376,000 | 53,991,000 | 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. **AJs against K9o 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 | 1.934 | 1.522 | 2.954 | 0.517 | | K9o | 0.517 | 2.954 | 1.522 | 1.934 | 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 Split by what the flop looks like, AJs peaks at 68.63% on paired flops and bottoms out at 60.41% on low rainbow flops (nine high or lower). AJs stays ahead on all five textures. **AJs against K9o by flop texture, in percent** | Flop | Share of flops | AJs wins | Ties | K9o wins | AJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 66.232 | 0.124 | 33.644 | 66.294 | | Rainbow, nine or lower | 7.042 | 59.934 | 0.948 | 39.118 | 60.408 | | Two-tone | 46.667 | 65.922 | 0.285 | 33.793 | 66.065 | | Monotone | 5.212 | 60.271 | 2.378 | 37.351 | 61.460 | | Paired | 17.091 | 68.321 | 0.612 | 31.067 | 68.627 | 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 Against one random hand instead, AJs holds 65.39% and K9o holds 57.81%. Facing each other changes that by +0.53 points for AJs and -23.73 points for K9o. **AJs and K9o 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 | 65.919 | 65.393 | +0.526 | 1.00804 | | AJs, rainbow, ten or higher | 66.294 | 65.393 | +0.901 | 1.01378 | | AJs, rainbow, nine or lower | 60.408 | 65.393 | -4.985 | 0.92377 | | AJs, two-tone | 66.065 | 65.393 | +0.672 | 1.01028 | | AJs, monotone | 61.460 | 65.393 | -3.933 | 0.93986 | | AJs, paired | 68.627 | 65.393 | +3.234 | 1.04945 | | K9o, all flops | 34.081 | 57.812 | -23.731 | 0.58951 | | K9o, rainbow, ten or higher | 33.706 | 57.812 | -24.106 | 0.58303 | | K9o, rainbow, nine or lower | 39.592 | 57.812 | -18.220 | 0.68484 | | K9o, two-tone | 33.935 | 57.812 | -23.877 | 0.58699 | | K9o, monotone | 38.540 | 57.812 | -19.272 | 0.66664 | | K9o, paired | 31.373 | 57.812 | -26.439 | 0.54267 | ## Does a shared suit matter? When the hands share a suit, AJs holds 65.69%; when they do not, it holds 66.15%. AJs does better with no shared suit, by 0.46 points. **AJs against K9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJs wins | Ties | K9o wins | AJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 65.441 | 0.499 | 34.060 | 65.690 | | No shared suit | 24 | 50.00 | 65.940 | 0.417 | 33.643 | 66.148 | ## How often this matchup comes up You will meet this exact matchup 0.0059% of the time in a random heads-up deal: 96 of 1,624,350, counting either seat order. ## A worked example Try it with money: two players each put in $100 and the whole board runs out every possible way. AJs averages $131.84 from the $200, up $31.84; K9o averages $68.16, down $31.84. Per 1,000 deals: AJs wins about 657, K9o wins about 338, and about 5 end in a split pot. ## The same matchup from the other side The mirror image, K9o against AJs, is 34.08% to 65.92%, and its address redirects to this page. ## Keep exploring The calculator link fills in AsJs against Kh9d, a deal where the two hands share no suit. Change any card to test your own hand. The neighboring matchups below swap one of the two hands for one of similar strength. - [Open AsJs against Kh9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJs&p2=Kh9d) - [AJs combos](https://georgelipoker.com/combos/ajs.md) - [K9o combos](https://georgelipoker.com/combos/k9o.md) - [AJs vs Q9s](https://georgelipoker.com/equity/ajs-vs-q9s.md) - [AJs vs JTs](https://georgelipoker.com/equity/ajs-vs-jts.md) - [AKo vs K9o](https://georgelipoker.com/equity/ako-vs-k9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed All 1,712,304 five-card boards are dealt for every suit pattern among the 48 specific deals of AJs against K9o, and both hands are scored on each. That is a full count, so the percentages are exact. Ties are half a win each, and each board appears once per flop it contains. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJs vs Q9s: preflop equity](https://georgelipoker.com/equity/ajs-vs-q9s.md) - [AJs vs JTs: preflop equity](https://georgelipoker.com/equity/ajs-vs-jts.md) - [AKo vs K9o: preflop equity](https://georgelipoker.com/equity/ako-vs-k9o.md)