--- title: "K9s vs J9s: preflop equity" url: "https://georgelipoker.com/equity/k9s-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/k9s-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "K9s is a big favorite over J9s before the flop: 69.23% to 30.77% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/k9s-vs-jto.md", "https://georgelipoker.com/equity/k9s-vs-t9s.md", "https://georgelipoker.com/equity/a5s-vs-j9s.md"] --- # K9s vs J9s: preflop equity K9s is a big favorite over J9s before the flop: 69.23% to 30.77% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, K9s is ahead of J9s by 38.46 points of equity, 69.23% to 30.77%. ## K9s against J9s: the numbers **Exact preflop results for K9s against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | K9s | 67.840 | 2.773 | 29.387 | 69.226 | | J9s | 29.387 | 2.773 | 67.840 | 30.774 | Here suited hands face each other, K9s on one side and J9s on the other. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up. That is a clear edge, 69.23% to 30.77%, but J9s still wins often enough that one hand proves nothing. The tie share is 2.77%: on those boards the pot is chopped and neither hand wins outright. K9s ranks number 29 of 169 starting hands, and J9s ranks number 55, by equity against a random hand. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | K9s | 13,940,000 | 570,000 | 6,038,000 | | J9s | 6,038,000 | 570,000 | 13,940,000 | The total is exact: 12 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. **K9s against J9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | K9s | 2.249 | 1.474 | 3.403 | 0.445 | | J9s | 0.445 | 3.403 | 1.474 | 2.249 | 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 The flop changes the picture. K9s does best on low rainbow flops (nine high or lower), at 80.65%, and worst on monotone flops, at 62.73%. K9s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **K9s against J9s by flop texture, in percent** | Flop | Share of flops | K9s wins | Ties | J9s wins | K9s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 66.844 | 2.123 | 31.033 | 67.905 | | Rainbow, nine or lower | 6.314 | 78.818 | 3.656 | 17.526 | 80.646 | | Two-tone | 46.543 | 66.833 | 2.181 | 30.986 | 67.924 | | Monotone | 5.215 | 60.439 | 4.581 | 34.980 | 62.730 | | Paired | 17.333 | 70.185 | 4.418 | 25.397 | 72.394 | Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank. ## Compared with a random hand A random hand would give K9s 59.99% and J9s 55.66%. Against each other the change is +9.24 points for K9s and -24.89 for J9s. **K9s and J9s 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 | | --- | --- | --- | --- | --- | | K9s, all flops | 69.226 | 59.988 | +9.238 | 1.15400 | | K9s, rainbow, ten or higher | 67.905 | 59.988 | +7.917 | 1.13198 | | K9s, rainbow, nine or lower | 80.646 | 59.988 | +20.658 | 1.34437 | | K9s, two-tone | 67.924 | 59.988 | +7.936 | 1.13229 | | K9s, monotone | 62.730 | 59.988 | +2.742 | 1.04571 | | K9s, paired | 72.394 | 59.988 | +12.406 | 1.20681 | | J9s, all flops | 30.774 | 55.662 | -24.888 | 0.55287 | | J9s, rainbow, ten or higher | 32.095 | 55.662 | -23.567 | 0.57661 | | J9s, rainbow, nine or lower | 19.354 | 55.662 | -36.308 | 0.34771 | | J9s, two-tone | 32.076 | 55.662 | -23.586 | 0.57626 | | J9s, monotone | 37.270 | 55.662 | -18.392 | 0.66958 | | J9s, paired | 27.606 | 55.662 | -28.056 | 0.49596 | ## Does a shared suit matter? A shared suit is impossible for this matchup, so K9s' 69.23% is the answer for every suit pattern. **K9s against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | K9s wins | Ties | J9s wins | K9s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 67.840 | 2.773 | 29.387 | 69.226 | ## How often this matchup comes up Exactly 12 specific deals fit this matchup in one seat order, which is 0.0007% of 1,624,350; both orders together give 24, or 0.0015%. ## A worked example Put $100 each into a $200 pot and deal every board once: K9s averages $138.46 back, ahead of its $100 by $38.46, while J9s averages $61.54, short of its $100 by $38.46. Over a long run, 1,000 deals split into about 678 for K9s, 294 for J9s and 28 tied. ## The same matchup from the other side The reversed view, J9s against K9s, shows 30.77% for J9s and 69.23% for K9s. It is the same count, so it redirects here. ## Keep exploring Try Ks9s against Jh9h 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 Ks9s against Jh9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=Ks9s&p2=Jh9h) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [K9s vs JTo](https://georgelipoker.com/equity/k9s-vs-jto.md) - [K9s vs T9s](https://georgelipoker.com/equity/k9s-vs-t9s.md) - [A5s vs J9s](https://georgelipoker.com/equity/a5s-vs-j9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Each figure is a complete count over boards. Take the 12 specific deals, group them by suit pattern, deal all 1,712,304 boards against each, and compare the two seven-card hands. Equity counts a tie as half a win; the flop rows use every one of a board's ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [K9s vs JTo: preflop equity](https://georgelipoker.com/equity/k9s-vs-jto.md) - [K9s vs T9s: preflop equity](https://georgelipoker.com/equity/k9s-vs-t9s.md) - [A5s vs J9s: preflop equity](https://georgelipoker.com/equity/a5s-vs-j9s.md)