--- title: "KJs vs A4s: preflop equity" url: "https://georgelipoker.com/equity/kjs-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/kjs-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KJs or A4s? A4s leads 57.09% to 42.91% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kjs-vs-a3s.md", "https://georgelipoker.com/equity/kjs-vs-qjo.md", "https://georgelipoker.com/equity/a8s-vs-a4s.md"] --- # KJs vs A4s: preflop equity Who is ahead, KJs or A4s? A4s leads 57.09% to 42.91% before the flop, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, A4s holds 57.09% equity against KJs, which leaves KJs with 42.91%. ## KJs against A4s: the numbers **Exact preflop results for KJs against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KJs | 42.648 | 0.533 | 56.819 | 42.914 | | A4s | 56.819 | 0.533 | 42.648 | 57.086 | This is a contest between two suited hands, KJs and A4s. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits. A4s is ahead, but KJs is far from dead: it takes 427 of every 1,000 deals outright. Ties are part of the picture: 0.53% of boards end in a split pot, and each side counts that as half a win. Place 20 of 169 belongs to KJs and place 35 belongs to A4s in the ranking 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 | 11,684,000 | 146,000 | 15,567,000 | | A4s | 15,567,000 | 146,000 | 11,684,000 | The board total is exact, 16 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **KJs 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) | | --- | --- | --- | --- | --- | | KJs | 0.752 | 2.345 | 1.760 | 1.330 | | A4s | 1.330 | 1.760 | 2.345 | 0.752 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops Low rainbow flops (nine high or lower) are the best for A4s (75.13%); rainbow flops topped by a ten or better are the worst (50.88%). A4s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KJs against A4s by flop texture, in percent** | Flop | Share of flops | KJs wins | Ties | A4s wins | KJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 49.063 | 0.124 | 50.813 | 49.125 | | Rainbow, nine or lower | 7.042 | 24.344 | 1.052 | 74.604 | 24.870 | | Two-tone | 46.727 | 43.946 | 0.298 | 55.756 | 44.095 | | Monotone | 5.273 | 43.757 | 3.442 | 52.801 | 45.478 | | Paired | 17.091 | 37.339 | 0.633 | 62.028 | 37.656 | A rainbow flop shows three suits, a two-tone flop repeats one suit, a monotone flop is a single suit, and a paired flop repeats a rank. ## Compared with a random hand How much does the opponent matter? Compared with its random-hand 62.57%, KJs changes by -19.66 points, and A4s, from 59.03%, by -1.94. **KJs 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 | | --- | --- | --- | --- | --- | | KJs, all flops | 42.914 | 62.567 | -19.653 | 0.68589 | | KJs, rainbow, ten or higher | 49.125 | 62.567 | -13.442 | 0.78516 | | KJs, rainbow, nine or lower | 24.870 | 62.567 | -37.697 | 0.39749 | | KJs, two-tone | 44.095 | 62.567 | -18.472 | 0.70476 | | KJs, monotone | 45.478 | 62.567 | -17.089 | 0.72687 | | KJs, paired | 37.656 | 62.567 | -24.911 | 0.60185 | | A4s, all flops | 57.086 | 59.034 | -1.948 | 0.96700 | | A4s, rainbow, ten or higher | 50.875 | 59.034 | -8.159 | 0.86179 | | A4s, rainbow, nine or lower | 75.130 | 59.034 | +16.096 | 1.27266 | | A4s, two-tone | 55.905 | 59.034 | -3.129 | 0.94700 | | A4s, monotone | 54.522 | 59.034 | -4.512 | 0.92357 | | A4s, paired | 62.344 | 59.034 | +3.310 | 1.05607 | ## Does a shared suit matter? Does suit overlap move the numbers? A4s has 58.99% when the hands share a suit and 56.45% when they do not. A4s does better with a shared suit, by 2.54 points. **KJs against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KJs wins | Ties | A4s wins | KJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 40.704 | 0.615 | 58.681 | 41.011 | | No shared suit | 12 | 75.00 | 43.296 | 0.505 | 56.199 | 43.549 | ## How often this matchup comes up This page stands for 16 specific-card matchups (0.0010% of 1,624,350 ordered deals), or 32 once you count the seats both ways (0.0020%). ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. A4s is worth $114.18 on average (+$14.18); KJs is worth $85.82 (-$14.18). In 1,000 deals of exactly this matchup, expect about 568 won outright by A4s, about 427 won outright by KJs and about 5 split. ## The same matchup from the other side A4s versus KJs is this same page seen from the other hand: 57.09% for A4s, 42.91% for KJs. ## Keep exploring Try KsJs against Ah4h 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 KsJs against Ah4h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsJs&p2=Ah4h) - [KJs combos](https://georgelipoker.com/combos/kjs.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [KJs vs A3s](https://georgelipoker.com/equity/kjs-vs-a3s.md) - [KJs vs QJo](https://georgelipoker.com/equity/kjs-vs-qjo.md) - [A8s vs A4s](https://georgelipoker.com/equity/a8s-vs-a4s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 16 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [KJs vs A3s: preflop equity](https://georgelipoker.com/equity/kjs-vs-a3s.md) - [KJs vs QJo: preflop equity](https://georgelipoker.com/equity/kjs-vs-qjo.md) - [A8s vs A4s: preflop equity](https://georgelipoker.com/equity/a8s-vs-a4s.md)