--- title: "KJo vs A4s: preflop equity" url: "https://georgelipoker.com/equity/kjo-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/kjo-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KJo or A4s? A4s leads 59.87% to 40.13% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kjo-vs-a3s.md", "https://georgelipoker.com/equity/kjo-vs-qjo.md", "https://georgelipoker.com/equity/55-vs-a4s.md"] --- # KJo vs A4s: preflop equity Who is ahead, KJo or A4s? A4s leads 59.87% to 40.13% before the flop, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, A4s holds 59.87% equity against KJo, which leaves KJo with 40.13%. ## KJo against A4s: the numbers **Exact preflop results for KJo against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KJo | 39.888 | 0.492 | 59.620 | 40.134 | | A4s | 59.620 | 0.492 | 39.888 | 59.866 | We compare an offsuit hand with a suited hand. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits. A4s is ahead, but KJo is far from dead: it takes 399 of every 1,000 deals outright. A split pot comes up on 0.49% of boards, so the wins and the equity differ by half of that. Ranked by equity against a random hand, KJo is number 26 of the 169 starting hands and A4s is number 35. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KJo | 32,784,000 | 404,000 | 49,002,000 | | A4s | 49,002,000 | 404,000 | 32,784,000 | The board total is exact, 48 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **KJo against A4s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | KJo | 0.670 | 2.507 | 1.677 | 1.492 | | A4s | 1.492 | 1.677 | 2.507 | 0.670 | 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 Low rainbow flops (nine high or lower) are the best for A4s (77.61%); rainbow flops topped by a ten or better are the worst (52.18%). A4s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KJo against A4s by flop texture, in percent** | Flop | Share of flops | KJo wins | Ties | A4s wins | KJo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 47.759 | 0.129 | 52.112 | 47.823 | | Rainbow, nine or lower | 7.042 | 21.841 | 1.096 | 77.063 | 22.389 | | Two-tone | 46.667 | 40.289 | 0.322 | 59.389 | 40.450 | | Monotone | 5.212 | 42.275 | 2.410 | 55.315 | 43.480 | | Paired | 17.091 | 34.451 | 0.632 | 64.917 | 34.767 | 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 -20.44 points for KJo, from 60.57%, and +0.84 for A4s, from 59.03%. **KJo and A4s 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 | | --- | --- | --- | --- | --- | | KJo, all flops | 40.134 | 60.569 | -20.435 | 0.66262 | | KJo, rainbow, ten or higher | 47.823 | 60.569 | -12.746 | 0.78956 | | KJo, rainbow, nine or lower | 22.389 | 60.569 | -38.180 | 0.36964 | | KJo, two-tone | 40.450 | 60.569 | -20.119 | 0.66783 | | KJo, monotone | 43.480 | 60.569 | -17.089 | 0.71786 | | KJo, paired | 34.767 | 60.569 | -25.802 | 0.57401 | | A4s, all flops | 59.866 | 59.034 | +0.832 | 1.01409 | | A4s, rainbow, ten or higher | 52.177 | 59.034 | -6.857 | 0.88385 | | A4s, rainbow, nine or lower | 77.611 | 59.034 | +18.577 | 1.31468 | | A4s, two-tone | 59.550 | 59.034 | +0.516 | 1.00874 | | A4s, monotone | 56.520 | 59.034 | -2.514 | 0.95741 | | A4s, paired | 65.233 | 59.034 | +6.199 | 1.10501 | ## Does a shared suit matter? Split by suits, the deals give A4s 59.53% when the hands overlap in a suit and 60.20% when they do not. A4s does better with no shared suit, by 0.67 points. **KJo against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KJo wins | Ties | A4s wins | KJo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 40.204 | 0.533 | 59.263 | 40.471 | | No shared suit | 24 | 50.00 | 39.571 | 0.451 | 59.978 | 39.797 | ## How often this matchup comes up The class pair covers 48 combinations of specific cards in a fixed seat order, 0.0030% of 1,624,350, and 96 (0.0059%) in either order. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says A4s gets $119.74 of it on average and KJo gets $80.26. Over a long run, 1,000 deals split into about 596 for A4s, 399 for KJo and 5 tied. ## The same matchup from the other side A4s versus KJo is this same page seen from the other hand: 59.87% for A4s, 40.13% for KJo. ## Keep exploring Try KsJh against Ad4d 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 KsJh against Ad4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsJh&p2=Ad4d) - [KJo combos](https://georgelipoker.com/combos/kjo.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [KJo vs A3s](https://georgelipoker.com/equity/kjo-vs-a3s.md) - [KJo vs QJo](https://georgelipoker.com/equity/kjo-vs-qjo.md) - [55 vs A4s](https://georgelipoker.com/equity/55-vs-a4s.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 48 specific deals of KJo against A4s, 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 - [KJo vs A3s: preflop equity](https://georgelipoker.com/equity/kjo-vs-a3s.md) - [KJo vs QJo: preflop equity](https://georgelipoker.com/equity/kjo-vs-qjo.md) - [55 vs A4s: preflop equity](https://georgelipoker.com/equity/55-vs-a4s.md)