--- title: "KJs vs A8s: preflop equity" url: "https://georgelipoker.com/equity/kjs-vs-a8s.md" canonical_url: "https://georgelipoker.com/equity/kjs-vs-a8s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KJs or A8s? A8s leads 56.90% to 43.10% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kjs-vs-kts.md", "https://georgelipoker.com/equity/kjs-vs-kqo.md", "https://georgelipoker.com/equity/ato-vs-a8s.md"] --- # KJs vs A8s: preflop equity Who is ahead, KJs or A8s? A8s leads 56.90% to 43.10% before the flop, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, A8s holds 56.90% equity against KJs, which leaves KJs with 43.10%. ## KJs against A8s: the numbers **Exact preflop results for KJs against A8s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KJs | 42.853 | 0.492 | 56.655 | 43.099 | | A8s | 56.655 | 0.492 | 42.853 | 56.901 | This is a contest between two suited hands, KJs and A8s. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. The lead is steady rather than large, and the flop still has plenty of say in who wins. Ties are 0.49% of the outcomes here; each tied board gives both hands half the pot. For context, KJs sits at number 20 of 169 starting hands and A8s at number 21 when each is run against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KJs | 11,740,000 | 135,000 | 15,522,000 | | A8s | 15,522,000 | 135,000 | 11,740,000 | The total is exact: 16 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. **KJs against A8s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | KJs | 0.757 | 2.334 | 1.765 | 1.320 | | A8s | 1.320 | 1.765 | 2.334 | 0.757 | 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 The flop changes the picture. A8s does best on low rainbow flops (nine high or lower), at 74.60%, and worst on rainbow flops topped by a ten or better, at 50.75%. A8s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KJs against A8s by flop texture, in percent** | Flop | Share of flops | KJs wins | Ties | A8s wins | KJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 49.193 | 0.121 | 50.686 | 49.254 | | Rainbow, nine or lower | 7.042 | 24.978 | 0.847 | 74.175 | 25.402 | | Two-tone | 46.727 | 44.178 | 0.254 | 55.568 | 44.305 | | Monotone | 5.273 | 43.959 | 3.406 | 52.635 | 45.662 | | Paired | 17.091 | 37.399 | 0.616 | 61.985 | 37.707 | 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 The table below sets each hand against its own random-hand baseline: a change of -19.47 points for KJs, from 62.57%, and -5.04 for A8s, from 61.94%. **KJs and A8s 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 | | --- | --- | --- | --- | --- | | KJs, all flops | 43.099 | 62.567 | -19.468 | 0.68885 | | KJs, rainbow, ten or higher | 49.254 | 62.567 | -13.313 | 0.78722 | | KJs, rainbow, nine or lower | 25.402 | 62.567 | -37.165 | 0.40600 | | KJs, two-tone | 44.305 | 62.567 | -18.262 | 0.70812 | | KJs, monotone | 45.662 | 62.567 | -16.905 | 0.72981 | | KJs, paired | 37.707 | 62.567 | -24.860 | 0.60267 | | A8s, all flops | 56.901 | 61.944 | -5.043 | 0.91859 | | A8s, rainbow, ten or higher | 50.746 | 61.944 | -11.198 | 0.81922 | | A8s, rainbow, nine or lower | 74.598 | 61.944 | +12.654 | 1.20428 | | A8s, two-tone | 55.695 | 61.944 | -6.249 | 0.89912 | | A8s, monotone | 54.338 | 61.944 | -7.606 | 0.87721 | | A8s, paired | 62.293 | 61.944 | +0.349 | 1.00563 | ## Does a shared suit matter? Split by suits, the deals give A8s 58.79% when the hands overlap in a suit and 56.27% when they do not. A8s does better with a shared suit, by 2.52 points. **KJs against A8s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KJs wins | Ties | A8s wins | KJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 40.931 | 0.569 | 58.500 | 41.215 | | No shared suit | 12 | 75.00 | 43.493 | 0.466 | 56.041 | 43.726 | ## How often this matchup comes up You will meet this exact matchup 0.0020% of the time in a random heads-up deal: 32 of 1,624,350, counting either seat order. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says A8s gets $113.80 of it on average and KJs gets $86.20. Scaled to 1,000 deals, that is roughly 567 wins for A8s, 428 for KJs and 5 chopped pots. ## The same matchup from the other side A8s against KJs adds nothing new: it is 56.90% for A8s and 43.10% for KJs, the same figures reversed. ## Keep exploring Open the calculator with KsJs against Ah8h already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking. - [Open KsJs against Ah8h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsJs&p2=Ah8h) - [KJs combos](https://georgelipoker.com/combos/kjs.md) - [A8s combos](https://georgelipoker.com/combos/a8s.md) - [KJs vs KTs](https://georgelipoker.com/equity/kjs-vs-kts.md) - [KJs vs KQo](https://georgelipoker.com/equity/kjs-vs-kqo.md) - [ATo vs A8s](https://georgelipoker.com/equity/ato-vs-a8s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 16 ways to deal one KJs and one A8s without reusing a card, grouped by suit pattern, every one of the 1,712,304 possible boards is dealt and both seven-card hands are compared. A tie counts as half a win in the equity column, and each board is counted once under each of its ten three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [KJs vs KTs: preflop equity](https://georgelipoker.com/equity/kjs-vs-kts.md) - [KJs vs KQo: preflop equity](https://georgelipoker.com/equity/kjs-vs-kqo.md) - [ATo vs A8s: preflop equity](https://georgelipoker.com/equity/ato-vs-a8s.md)