--- title: "KTo vs A4s: preflop equity" url: "https://georgelipoker.com/equity/kto-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/kto-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KTo or A4s? A4s leads 59.55% to 40.45% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kto-vs-a3s.md", "https://georgelipoker.com/equity/kto-vs-qjo.md", "https://georgelipoker.com/equity/qts-vs-a4s.md"] --- # KTo vs A4s: preflop equity Who is ahead, KTo or A4s? A4s leads 59.55% to 40.45% before the flop, counted exactly over every board, with the split by flop type and suit. Counting every board, the equity split is 59.55% for A4s and 40.45% for KTo, so A4s leads by 19.10 points. ## KTo against A4s: the numbers **Exact preflop results for KTo against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KTo | 40.214 | 0.480 | 59.306 | 40.454 | | A4s | 59.306 | 0.480 | 40.214 | 59.546 | The matchup pits an offsuit hand against a suited hand. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. A 19.10 point lead is real, and KTo still takes about 402 of every 1,000 deals outright. Ties are 0.48% of the outcomes here; each tied board gives both hands half the pot. KTo ranks number 33 of 169 starting hands, and A4s ranks number 35, by equity against a random hand. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KTo | 33,052,000 | 395,000 | 48,744,000 | | A4s | 48,744,000 | 395,000 | 33,052,000 | The total is exact: 48 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. **KTo 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) | | --- | --- | --- | --- | --- | | KTo | 0.679 | 2.487 | 1.686 | 1.472 | | A4s | 1.472 | 1.686 | 2.487 | 0.679 | The final column gives the least the pot must offer for each unit called for a call to break even at this equity. ## Who is ahead on which flops Across the five flop textures A4s' equity moves by 24.02 points, from 52.11% on rainbow flops topped by a ten or better to 76.13% on low rainbow flops (nine high or lower). A4s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KTo against A4s by flop texture, in percent** | Flop | Share of flops | KTo wins | Ties | A4s wins | KTo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 47.809 | 0.169 | 52.022 | 47.893 | | Rainbow, nine or lower | 7.042 | 23.433 | 0.884 | 75.683 | 23.875 | | Two-tone | 46.667 | 40.652 | 0.307 | 59.041 | 40.805 | | Monotone | 5.212 | 42.528 | 2.401 | 55.071 | 43.728 | | Paired | 17.091 | 34.568 | 0.637 | 64.795 | 34.887 | 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 Each hand has a baseline against a random hand: 59.74% for KTo, 59.03% for A4s. Here the change is -19.29 and +0.52 points. **KTo 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 | | --- | --- | --- | --- | --- | | KTo, all flops | 40.454 | 59.739 | -19.285 | 0.67718 | | KTo, rainbow, ten or higher | 47.893 | 59.739 | -11.846 | 0.80170 | | KTo, rainbow, nine or lower | 23.875 | 59.739 | -35.864 | 0.39966 | | KTo, two-tone | 40.805 | 59.739 | -18.934 | 0.68305 | | KTo, monotone | 43.728 | 59.739 | -16.011 | 0.73198 | | KTo, paired | 34.887 | 59.739 | -24.852 | 0.58399 | | A4s, all flops | 59.546 | 59.034 | +0.512 | 1.00867 | | A4s, rainbow, ten or higher | 52.107 | 59.034 | -6.927 | 0.88266 | | A4s, rainbow, nine or lower | 76.125 | 59.034 | +17.091 | 1.28951 | | A4s, two-tone | 59.195 | 59.034 | +0.161 | 1.00273 | | A4s, monotone | 56.272 | 59.034 | -2.762 | 0.95321 | | A4s, paired | 65.113 | 59.034 | +6.079 | 1.10297 | ## Does a shared suit matter? When the hands share a suit, A4s holds 59.21%; when they do not, it holds 59.89%. A4s does better with no shared suit, by 0.68 points. **KTo against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KTo wins | Ties | A4s wins | KTo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 40.533 | 0.522 | 58.945 | 40.794 | | No shared suit | 24 | 50.00 | 39.896 | 0.438 | 59.666 | 40.115 | ## How often this matchup comes up You will meet this exact matchup 0.0059% of the time in a random heads-up deal: 96 of 1,624,350, counting either seat order. ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. A4s is worth $119.10 on average (+$19.10); KTo is worth $80.90 (-$19.10). Run 1,000 deals and the tally comes out near 593 for A4s, 402 for KTo and 5 ties. ## The same matchup from the other side Swap the hands and you get A4s with 59.55% against KTo with 40.45%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring Try KsTh 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 KsTh against Ad4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsTh&p2=Ad4d) - [KTo combos](https://georgelipoker.com/combos/kto.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [KTo vs A3s](https://georgelipoker.com/equity/kto-vs-a3s.md) - [KTo vs QJo](https://georgelipoker.com/equity/kto-vs-qjo.md) - [QTs vs A4s](https://georgelipoker.com/equity/qts-vs-a4s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 48 ways to deal one KTo and one A4s 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 - [KTo vs A3s: preflop equity](https://georgelipoker.com/equity/kto-vs-a3s.md) - [KTo vs QJo: preflop equity](https://georgelipoker.com/equity/kto-vs-qjo.md) - [QTs vs A4s: preflop equity](https://georgelipoker.com/equity/qts-vs-a4s.md)