--- title: "KK vs J9s: preflop equity" url: "https://georgelipoker.com/equity/kk-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/kk-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "KK is a big favorite over J9s before the flop: 80.55% to 19.45% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kk-vs-jto.md", "https://georgelipoker.com/equity/kk-vs-t9s.md", "https://georgelipoker.com/equity/qq-vs-j9s.md"] --- # KK vs J9s: preflop equity KK is a big favorite over J9s before the flop: 80.55% to 19.45% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, KK takes 80.55% of the pot on average and J9s takes the other 19.45%. ## KK against J9s: the numbers **Exact preflop results for KK against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KK | 80.355 | 0.396 | 19.249 | 80.553 | | J9s | 19.249 | 0.396 | 80.355 | 19.447 | The first hand is a pocket pair; the second is a suited hand. Here a pair faces two cards that are both smaller, so the other hand needs to pair up and still be behind. KK is a big favorite here before anyone sees a flop. 0.40% of boards are ties, so the equity of each hand is its win rate plus half of that. Place 2 of 169 belongs to KK and place 55 belongs to J9s in the ranking against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KK | 33,022,000 | 163,000 | 7,910,000 | | J9s | 7,910,000 | 163,000 | 33,022,000 | 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. **KK 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) | | --- | --- | --- | --- | --- | | KK | 4.142 | 1.244 | 5.195 | 0.241 | | J9s | 0.241 | 5.195 | 1.244 | 4.142 | 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 KK prefers low rainbow flops (nine high or lower), where it holds 85.15%, and likes monotone flops least, where it holds 74.84%. KK stays ahead on all five textures. **KK against J9s by flop texture, in percent** | Flop | Share of flops | KK wins | Ties | J9s wins | KK equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 81.370 | 0.159 | 18.471 | 81.450 | | Rainbow, nine or lower | 7.042 | 84.659 | 0.979 | 14.362 | 85.149 | | Two-tone | 46.545 | 78.539 | 0.318 | 21.143 | 78.698 | | Monotone | 5.212 | 73.639 | 2.406 | 23.955 | 74.842 | | Paired | 17.334 | 84.105 | 0.092 | 15.803 | 84.151 | 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, 82.40% for KK and 55.66% for J9s. This opponent changes them by -1.85 and -36.21 points. **KK 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 | | --- | --- | --- | --- | --- | | KK, all flops | 80.553 | 82.396 | -1.843 | 0.97763 | | KK, rainbow, ten or higher | 81.450 | 82.396 | -0.946 | 0.98852 | | KK, rainbow, nine or lower | 85.149 | 82.396 | +2.753 | 1.03341 | | KK, two-tone | 78.698 | 82.396 | -3.698 | 0.95512 | | KK, monotone | 74.842 | 82.396 | -7.554 | 0.90832 | | KK, paired | 84.151 | 82.396 | +1.755 | 1.02130 | | J9s, all flops | 19.447 | 55.662 | -36.215 | 0.34938 | | J9s, rainbow, ten or higher | 18.550 | 55.662 | -37.112 | 0.33326 | | J9s, rainbow, nine or lower | 14.851 | 55.662 | -40.811 | 0.26681 | | J9s, two-tone | 21.302 | 55.662 | -34.360 | 0.38270 | | J9s, monotone | 25.158 | 55.662 | -30.504 | 0.45198 | | J9s, paired | 15.849 | 55.662 | -39.813 | 0.28474 | ## Does a shared suit matter? Split by suits, the deals give KK 81.14% when the hands overlap in a suit and 79.97% when they do not. KK does better with a shared suit, by 1.17 points. **KK against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KK wins | Ties | J9s wins | KK equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 80.919 | 0.437 | 18.644 | 81.137 | | No shared suit | 12 | 50.00 | 79.791 | 0.356 | 19.853 | 79.969 | ## How often this matchup comes up How often does it happen? 24 of the 1,624,350 ordered deals (0.0015%) are KK against J9s, and 48 (0.0030%) if either hand may sit in either seat. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says KK gets $161.10 of it on average and J9s gets $38.90. Out of 1,000 deals you should see around 804 outright wins for KK, 192 for J9s, and 4 split pots. ## The same matchup from the other side Read it from the other side: J9s against KK is the same matchup with the numbers swapped, so J9s holds 19.45% and KK holds 80.55%. That address sends you back to this page. ## Keep exploring KsKh against Jd9d 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 KsKh against Jd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsKh&p2=Jd9d) - [KK combos](https://georgelipoker.com/combos/kk.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [KK vs JTo](https://georgelipoker.com/equity/kk-vs-jto.md) - [KK vs T9s](https://georgelipoker.com/equity/kk-vs-t9s.md) - [QQ vs J9s](https://georgelipoker.com/equity/qq-vs-j9s.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 24 specific deals of KK against J9s, 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 - [KK vs JTo: preflop equity](https://georgelipoker.com/equity/kk-vs-jto.md) - [KK vs T9s: preflop equity](https://georgelipoker.com/equity/kk-vs-t9s.md) - [QQ vs J9s: preflop equity](https://georgelipoker.com/equity/qq-vs-j9s.md)