--- title: "AA vs K9s: preflop equity" url: "https://georgelipoker.com/equity/aa-vs-k9s.md" canonical_url: "https://georgelipoker.com/equity/aa-vs-k9s" last_updated: "2026-10-23" type: "reference" summary: "AA is a big favorite over K9s before the flop: 82.73% to 17.27% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/aa-vs-a5s.md", "https://georgelipoker.com/equity/aa-vs-a6s.md", "https://georgelipoker.com/equity/kk-vs-k9s.md"] --- # AA vs K9s: preflop equity AA is a big favorite over K9s before the flop: 82.73% to 17.27% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, AA takes 82.73% of the pot on average and K9s takes the other 17.27%. ## AA against K9s: the numbers **Exact preflop results for AA against K9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AA | 82.532 | 0.390 | 17.078 | 82.727 | | K9s | 17.078 | 0.390 | 82.532 | 17.273 | The matchup pits a pocket pair against a suited hand. The pair outranks both of the other hand's cards, which is why the pair is a strong favorite. A gap this wide means K9s is in trouble before the flop and has few good runouts. 0.39% of boards are ties, so the equity of each hand is its win rate plus half of that. The hand ranking puts AA at 1 and K9s at 29 out of 169 starting hands. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AA | 33,917,000 | 160,000 | 7,018,000 | | K9s | 7,018,000 | 160,000 | 33,917,000 | The total is exact: 24 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. **AA 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) | | --- | --- | --- | --- | --- | | AA | 4.789 | 1.212 | 5.855 | 0.209 | | K9s | 0.209 | 5.855 | 1.212 | 4.789 | 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 AA prefers low rainbow flops (nine high or lower), where it holds 87.42%, and likes monotone flops least, where it holds 76.67%. AA stays ahead on all five textures. **AA against K9s by flop texture, in percent** | Flop | Share of flops | AA wins | Ties | K9s wins | AA equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 84.063 | 0.165 | 15.772 | 84.145 | | Rainbow, nine or lower | 7.042 | 86.915 | 1.016 | 12.069 | 87.423 | | Two-tone | 46.545 | 80.920 | 0.327 | 18.753 | 81.084 | | Monotone | 5.212 | 75.464 | 2.410 | 22.126 | 76.669 | | Paired | 17.334 | 85.097 | 0.007 | 14.896 | 85.101 | 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 Start from the random-hand figures, 85.20% for AA and 59.99% for K9s. This opponent changes them by -2.47 and -42.72 points. **AA 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 | | --- | --- | --- | --- | --- | | AA, all flops | 82.727 | 85.204 | -2.477 | 0.97093 | | AA, rainbow, ten or higher | 84.145 | 85.204 | -1.059 | 0.98757 | | AA, rainbow, nine or lower | 87.423 | 85.204 | +2.219 | 1.02604 | | AA, two-tone | 81.084 | 85.204 | -4.120 | 0.95165 | | AA, monotone | 76.669 | 85.204 | -8.535 | 0.89983 | | AA, paired | 85.101 | 85.204 | -0.103 | 0.99879 | | K9s, all flops | 17.273 | 59.988 | -42.715 | 0.28794 | | K9s, rainbow, ten or higher | 15.855 | 59.988 | -44.133 | 0.26430 | | K9s, rainbow, nine or lower | 12.577 | 59.988 | -47.411 | 0.20966 | | K9s, two-tone | 18.916 | 59.988 | -41.072 | 0.31533 | | K9s, monotone | 23.331 | 59.988 | -36.657 | 0.38893 | | K9s, paired | 14.899 | 59.988 | -45.089 | 0.24837 | ## Does a shared suit matter? The suit split reads 83.37% for AA with a shared suit and 82.09% without one. AA does better with a shared suit, by 1.28 points. **AA against K9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | AA wins | Ties | K9s wins | AA equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 83.151 | 0.432 | 16.417 | 83.367 | | No shared suit | 12 | 50.00 | 81.913 | 0.348 | 17.739 | 82.087 | ## How often this matchup comes up How often does it happen? 24 of the 1,624,350 ordered deals (0.0015%) are AA against K9s, and 48 (0.0030%) if either hand may sit in either seat. ## A worked example With $100 from each side, the $200 pot is split on average as $165.46 for AA and $34.54 for K9s; the first side gains $65.46 per all-in and the second gives up $65.46. Think in thousands: about 825 of 1,000 go to AA, about 171 go to K9s, and about 4 are chopped. ## The same matchup from the other side K9s versus AA is this same page seen from the other hand: 17.27% for K9s, 82.73% for AA. ## Keep exploring AsAh against Kd9d 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 Kd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsAh&p2=Kd9d) - [AA combos](https://georgelipoker.com/combos/aa.md) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [AA vs A5s](https://georgelipoker.com/equity/aa-vs-a5s.md) - [AA vs A6s](https://georgelipoker.com/equity/aa-vs-a6s.md) - [KK vs K9s](https://georgelipoker.com/equity/kk-vs-k9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 24 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 - [AA vs A5s: preflop equity](https://georgelipoker.com/equity/aa-vs-a5s.md) - [AA vs A6s: preflop equity](https://georgelipoker.com/equity/aa-vs-a6s.md) - [KK vs K9s: preflop equity](https://georgelipoker.com/equity/kk-vs-k9s.md)