--- title: "K9o vs J9s: preflop equity" url: "https://georgelipoker.com/equity/k9o-vs-j9s.md" canonical_url: "https://georgelipoker.com/equity/k9o-vs-j9s" last_updated: "2026-10-23" type: "reference" summary: "K9o is a big favorite over J9s before the flop: 68.07% to 31.94% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/k9o-vs-jto.md", "https://georgelipoker.com/equity/k9o-vs-t9s.md", "https://georgelipoker.com/equity/q9s-vs-j9s.md"] --- # K9o vs J9s: preflop equity K9o is a big favorite over J9s before the flop: 68.07% to 31.94% equity, counted exactly over every board, with the split by flop type and suit. In equity, K9o against J9s stands at 68.07% to 31.93%, a gap of 36.14 points. ## K9o against J9s: the numbers **Exact preflop results for K9o against J9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | K9o | 66.636 | 2.858 | 30.506 | 68.065 | | J9s | 30.506 | 2.858 | 66.636 | 31.935 | The matchup pits an offsuit hand against a suited hand. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing. A lead of 36.14 points is large but not decisive: J9s still takes about 305 of every 1,000 deals. About 2.86% of boards chop the pot, which is why equity sits slightly above the win figure for both hands. For context, K9o sits at number 40 of 169 starting hands and J9s at number 55 when each is run against a random hand. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | K9o | 41,076,000 | 1,762,000 | 18,805,000 | | J9s | 18,805,000 | 1,762,000 | 41,076,000 | The board total is exact, 36 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **K9o 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) | | --- | --- | --- | --- | --- | | K9o | 2.131 | 1.501 | 3.278 | 0.469 | | J9s | 0.469 | 3.278 | 1.501 | 2.131 | The last column is the smallest pot odds, written as a pot-to-call ratio, at which a call breaks even with this equity. ## Who is ahead on which flops K9o prefers low rainbow flops (nine high or lower), where it holds 80.01%, and likes monotone flops least, where it holds 63.84%. K9o stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **K9o against J9s by flop texture, in percent** | Flop | Share of flops | K9o wins | Ties | J9s wins | K9o equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.634 | 65.868 | 2.181 | 31.951 | 66.959 | | Rainbow, nine or lower | 6.314 | 78.099 | 3.811 | 18.090 | 80.005 | | Two-tone | 46.527 | 65.064 | 2.360 | 32.576 | 66.244 | | Monotone | 5.192 | 61.958 | 3.766 | 34.276 | 63.841 | | Paired | 17.333 | 69.174 | 4.536 | 26.290 | 71.442 | Read the flop types this way: rainbow has three suits, two-tone has two cards of one suit, monotone has three, and paired repeats a rank. ## Compared with a random hand Each hand has a baseline against a random hand: 57.81% for K9o, 55.66% for J9s. Here the change is +10.26 and -23.73 points. **K9o 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 | | --- | --- | --- | --- | --- | | K9o, all flops | 68.065 | 57.812 | +10.253 | 1.17735 | | K9o, rainbow, ten or higher | 66.959 | 57.812 | +9.147 | 1.15822 | | K9o, rainbow, nine or lower | 80.005 | 57.812 | +22.193 | 1.38388 | | K9o, two-tone | 66.244 | 57.812 | +8.432 | 1.14585 | | K9o, monotone | 63.841 | 57.812 | +6.029 | 1.10429 | | K9o, paired | 71.442 | 57.812 | +13.630 | 1.23576 | | J9s, all flops | 31.935 | 55.662 | -23.727 | 0.57373 | | J9s, rainbow, ten or higher | 33.041 | 55.662 | -22.621 | 0.59360 | | J9s, rainbow, nine or lower | 19.995 | 55.662 | -35.667 | 0.35922 | | J9s, two-tone | 33.756 | 55.662 | -21.906 | 0.60645 | | J9s, monotone | 36.159 | 55.662 | -19.503 | 0.64962 | | J9s, paired | 28.558 | 55.662 | -27.104 | 0.51306 | ## Does a shared suit matter? Does suit overlap move the numbers? K9o has 69.09% when the hands share a suit and 67.55% when they do not. K9o does better with a shared suit, by 1.54 points. **K9o against J9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | K9o wins | Ties | J9s wins | K9o equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 33.33 | 67.622 | 2.940 | 29.438 | 69.092 | | No shared suit | 24 | 66.67 | 66.143 | 2.816 | 31.041 | 67.551 | ## How often this matchup comes up You will meet this exact matchup 0.0044% of the time in a random heads-up deal: 72 of 1,624,350, counting either seat order. ## A worked example Take a $200 pot built from $100 each. K9o's equity of 68.07% is worth $136.14, a $36.14 edge, and J9s' 31.93% is worth $63.86, which is $36.14 under its stake. In 1,000 deals of exactly this matchup, expect about 666 won outright by K9o, about 305 won outright by J9s and about 29 split. ## The same matchup from the other side If you came looking for J9s against K9o, the numbers are the same with the hands swapped: 31.93% and 68.07%. ## Keep exploring The calculator link fills in Ks9h against Jd9d, a deal where the two hands share no suit. Change any card to test your own hand. The neighboring matchups below swap one of the two hands for one of similar strength. - [Open Ks9h against Jd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=Ks9h&p2=Jd9d) - [K9o combos](https://georgelipoker.com/combos/k9o.md) - [J9s combos](https://georgelipoker.com/combos/j9s.md) - [K9o vs JTo](https://georgelipoker.com/equity/k9o-vs-jto.md) - [K9o vs T9s](https://georgelipoker.com/equity/k9o-vs-t9s.md) - [Q9s vs J9s](https://georgelipoker.com/equity/q9s-vs-j9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 36 deals of K9o against J9s 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 - [K9o vs JTo: preflop equity](https://georgelipoker.com/equity/k9o-vs-jto.md) - [K9o vs T9s: preflop equity](https://georgelipoker.com/equity/k9o-vs-t9s.md) - [Q9s vs J9s: preflop equity](https://georgelipoker.com/equity/q9s-vs-j9s.md)