--- title: "A9o vs K9o: preflop equity" url: "https://georgelipoker.com/equity/a9o-vs-k9o.md" canonical_url: "https://georgelipoker.com/equity/a9o-vs-k9o" last_updated: "2026-10-23" type: "reference" summary: "A9o is a big favorite over K9o before the flop: 74.14% to 25.86% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9o-vs-q9s.md", "https://georgelipoker.com/equity/a9o-vs-jts.md", "https://georgelipoker.com/equity/kjo-vs-k9o.md"] --- # A9o vs K9o: preflop equity A9o is a big favorite over K9o before the flop: 74.14% to 25.86% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, A9o takes 74.14% of the pot on average and K9o takes the other 25.86%. ## A9o against K9o: the numbers **Exact preflop results for A9o against K9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9o | 73.067 | 2.139 | 24.794 | 74.137 | | K9o | 24.794 | 2.139 | 73.067 | 25.863 | A9o and K9o are both offsuit hands. The two hands share a rank, and the one with the better other card dominates: it wins most kicker battles when that shared rank hits. A9o is the clear favorite, though K9o gets there on roughly one board in 4. 2.14% of boards are ties, so the equity of each hand is its win rate plus half of that. Ranked by equity against a random hand, A9o is number 25 of the 169 starting hands and K9o is number 40. **Boards behind the percentages: 184,928,832 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A9o | 135,122,000 | 3,956,000 | 45,851,000 | | K9o | 45,851,000 | 3,956,000 | 135,122,000 | Exact total: 108 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. **A9o 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) | | --- | --- | --- | --- | --- | | A9o | 2.867 | 1.369 | 4.033 | 0.349 | | K9o | 0.349 | 4.033 | 1.369 | 2.867 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops The flop changes the picture. A9o does best on low rainbow flops (nine high or lower), at 86.01%, and worst on monotone flops, at 68.48%. A9o stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **A9o against K9o by flop texture, in percent** | Flop | Share of flops | A9o wins | Ties | K9o wins | A9o equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.731 | 70.263 | 1.564 | 28.173 | 71.045 | | Rainbow, nine or lower | 6.314 | 83.892 | 4.227 | 11.881 | 86.005 | | Two-tone | 46.477 | 72.437 | 2.023 | 25.540 | 73.449 | | Monotone | 5.144 | 67.089 | 2.773 | 30.138 | 68.476 | | Paired | 17.334 | 76.587 | 2.322 | 21.091 | 77.748 | 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 Relative to a random opponent, A9o changes by +13.37 points (baseline 60.77%) and K9o by -31.95 points (baseline 57.81%). **A9o 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 | | --- | --- | --- | --- | --- | | A9o, all flops | 74.137 | 60.773 | +13.364 | 1.21990 | | A9o, rainbow, ten or higher | 71.045 | 60.773 | +10.272 | 1.16902 | | A9o, rainbow, nine or lower | 86.005 | 60.773 | +25.232 | 1.41518 | | A9o, two-tone | 73.449 | 60.773 | +12.676 | 1.20858 | | A9o, monotone | 68.476 | 60.773 | +7.703 | 1.12675 | | A9o, paired | 77.748 | 60.773 | +16.975 | 1.27932 | | K9o, all flops | 25.863 | 57.812 | -31.949 | 0.44736 | | K9o, rainbow, ten or higher | 28.955 | 57.812 | -28.857 | 0.50085 | | K9o, rainbow, nine or lower | 13.995 | 57.812 | -43.817 | 0.24208 | | K9o, two-tone | 26.551 | 57.812 | -31.261 | 0.45926 | | K9o, monotone | 31.524 | 57.812 | -26.288 | 0.54528 | | K9o, paired | 22.252 | 57.812 | -35.560 | 0.38490 | ## Does a shared suit matter? Looking only at deals where the hands share a suit, A9o has 74.24%; looking only at deals where they do not, 73.78%. A9o does better with a shared suit, by 0.46 points. **A9o against K9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9o wins | Ties | K9o wins | A9o equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 84 | 77.78 | 73.157 | 2.164 | 24.679 | 74.239 | | No shared suit | 24 | 22.22 | 72.754 | 2.050 | 25.196 | 73.779 | ## How often this matchup comes up How often does it happen? 108 of the 1,624,350 ordered deals (0.0066%) are A9o against K9o, and 216 (0.0133%) if either hand may sit in either seat. ## A worked example Take a $200 pot built from $100 each. A9o's equity of 74.14% is worth $148.28, a $48.28 edge, and K9o's 25.86% is worth $51.72, which is $48.28 under its stake. Out of 1,000 deals you should see around 731 outright wins for A9o, 248 for K9o, and 21 split pots. ## The same matchup from the other side One page covers both views. From K9o's side the equity is 25.86%, and from A9o's side it is 74.14%. ## Keep exploring As9h 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 As9h against Kd9c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9h&p2=Kd9c) - [A9o combos](https://georgelipoker.com/combos/a9o.md) - [K9o combos](https://georgelipoker.com/combos/k9o.md) - [A9o vs Q9s](https://georgelipoker.com/equity/a9o-vs-q9s.md) - [A9o vs JTs](https://georgelipoker.com/equity/a9o-vs-jts.md) - [KJo vs K9o](https://georgelipoker.com/equity/kjo-vs-k9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 108 deals of A9o against K9o fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A9o vs Q9s: preflop equity](https://georgelipoker.com/equity/a9o-vs-q9s.md) - [A9o vs JTs: preflop equity](https://georgelipoker.com/equity/a9o-vs-jts.md) - [KJo vs K9o: preflop equity](https://georgelipoker.com/equity/kjo-vs-k9o.md)