--- title: "AA vs K9o: preflop equity" url: "https://georgelipoker.com/equity/aa-vs-k9o.md" canonical_url: "https://georgelipoker.com/equity/aa-vs-k9o" last_updated: "2026-10-23" type: "reference" summary: "AA is a big favorite over K9o before the flop: 86.87% to 13.13% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/aa-vs-q9s.md", "https://georgelipoker.com/equity/aa-vs-jts.md", "https://georgelipoker.com/equity/kk-vs-k9o.md"] --- # AA vs K9o: preflop equity AA is a big favorite over K9o before the flop: 86.87% to 13.13% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, AA is ahead of K9o by 73.74 points of equity, 86.87% to 13.13%. ## AA against K9o: the numbers **Exact preflop results for AA against K9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AA | 86.685 | 0.370 | 12.945 | 86.870 | | K9o | 12.945 | 0.370 | 86.685 | 13.130 | AA, a pocket pair, plays K9o, an offsuit hand. The pair outranks both of the other hand's cards, which is why the pair is a strong favorite. AA is a big favorite here before anyone sees a flop. Ties are part of the picture: 0.37% of boards end in a split pot, and each side counts that as half a win. By strength against a random hand, AA holds place 1 of 169 and K9o holds place 40. **Boards behind the percentages: 123,285,888 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AA | 106,870,000 | 456,000 | 15,959,000 | | K9o | 15,959,000 | 456,000 | 106,870,000 | Exact total: 72 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. **AA 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) | | --- | --- | --- | --- | --- | | AA | 6.616 | 1.154 | 7.725 | 0.151 | | K9o | 0.151 | 7.725 | 1.154 | 6.616 | 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 If you know the kind of flop that came, the numbers shift: AA holds 90.19% on low rainbow flops (nine high or lower) and 81.53% on monotone flops. AA stays ahead on all five textures. **AA against K9o by flop texture, in percent** | Flop | Share of flops | AA wins | Ties | K9o wins | AA equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 86.249 | 0.168 | 13.583 | 86.333 | | Rainbow, nine or lower | 7.042 | 89.663 | 1.059 | 9.278 | 90.193 | | Two-tone | 46.485 | 86.411 | 0.355 | 13.234 | 86.589 | | Monotone | 5.151 | 80.663 | 1.731 | 17.606 | 81.529 | | Paired | 17.334 | 88.602 | 0.007 | 11.391 | 88.605 | Rainbow flops have three suits, two-tone flops repeat one suit, monotone flops are all one suit, and paired flops repeat a rank. ## Compared with a random hand How much does the opponent matter? Compared with its random-hand 85.20%, AA changes by +1.67 points, and K9o, from 57.81%, by -44.68. **AA 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 | | --- | --- | --- | --- | --- | | AA, all flops | 86.870 | 85.204 | +1.666 | 1.01955 | | AA, rainbow, ten or higher | 86.333 | 85.204 | +1.129 | 1.01325 | | AA, rainbow, nine or lower | 90.193 | 85.204 | +4.989 | 1.05855 | | AA, two-tone | 86.589 | 85.204 | +1.385 | 1.01626 | | AA, monotone | 81.529 | 85.204 | -3.675 | 0.95687 | | AA, paired | 88.605 | 85.204 | +3.401 | 1.03992 | | K9o, all flops | 13.130 | 57.812 | -44.682 | 0.22712 | | K9o, rainbow, ten or higher | 13.667 | 57.812 | -44.145 | 0.23640 | | K9o, rainbow, nine or lower | 9.807 | 57.812 | -48.005 | 0.16964 | | K9o, two-tone | 13.411 | 57.812 | -44.401 | 0.23198 | | K9o, monotone | 18.471 | 57.812 | -39.341 | 0.31950 | | K9o, paired | 11.395 | 57.812 | -46.417 | 0.19710 | ## Does a shared suit matter? Of the deals of this matchup, 60 share a suit (AA at 87.03%) and 12 do not (86.10%). AA does better with a shared suit, by 0.93 points. **AA against K9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | AA wins | Ties | K9o wins | AA equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 60 | 83.33 | 86.832 | 0.386 | 12.782 | 87.025 | | No shared suit | 12 | 16.67 | 85.952 | 0.290 | 13.758 | 86.097 | ## How often this matchup comes up AA against K9o is made up of 72 specific-card matchups in one seat order, 0.0044% of the 1,624,350 ordered deals, and 144 counting both seat orders, 0.0089%. ## A worked example Try it with money: two players each put in $100 and the whole board runs out every possible way. AA averages $173.74 from the $200, up $73.74; K9o averages $26.26, down $73.74. Run 1,000 deals and the tally comes out near 867 for AA, 129 for K9o and 4 ties. ## The same matchup from the other side Read it from the other side: K9o against AA is the same matchup with the numbers swapped, so K9o holds 13.13% and AA holds 86.87%. That address sends you back to this page. ## Keep exploring AsAh against Kd9c is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open AsAh against Kd9c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsAh&p2=Kd9c) - [AA combos](https://georgelipoker.com/combos/aa.md) - [K9o combos](https://georgelipoker.com/combos/k9o.md) - [AA vs Q9s](https://georgelipoker.com/equity/aa-vs-q9s.md) - [AA vs JTs](https://georgelipoker.com/equity/aa-vs-jts.md) - [KK vs K9o](https://georgelipoker.com/equity/kk-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 72 specific deals of AA 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 - [AA vs Q9s: preflop equity](https://georgelipoker.com/equity/aa-vs-q9s.md) - [AA vs JTs: preflop equity](https://georgelipoker.com/equity/aa-vs-jts.md) - [KK vs K9o: preflop equity](https://georgelipoker.com/equity/kk-vs-k9o.md)