--- title: "KK vs A4s: preflop equity" url: "https://georgelipoker.com/equity/kk-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/kk-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "KK is a big favorite over A4s before the flop: 67.03% to 32.98% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kk-vs-a3s.md", "https://georgelipoker.com/equity/kk-vs-qjo.md", "https://georgelipoker.com/equity/qq-vs-a4s.md"] --- # KK vs A4s: preflop equity KK is a big favorite over A4s before the flop: 67.03% to 32.98% equity, counted exactly over every board, with the split by flop type and suit. In equity, KK against A4s stands at 67.03% to 32.97%, a gap of 34.06 points. ## KK against A4s: the numbers **Exact preflop results for KK against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KK | 66.801 | 0.448 | 32.751 | 67.025 | | A4s | 32.751 | 0.448 | 66.801 | 32.975 | KK and A4s are a pocket pair and a suited hand, in that order. The pair is ahead of one card and behind the other, so the board decides how that plays out. That is a clear edge, 67.03% to 32.97%, but A4s still wins often enough that one hand proves nothing. Split pots make up 0.45% of the boards, and both equity figures count them as half a win each. Among the 169 starting hands, KK is number 2 and A4s is number 35 by strength against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KK | 27,452,000 | 184,000 | 13,459,000 | | A4s | 13,459,000 | 184,000 | 27,452,000 | The total is exact: 24 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. **KK 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) | | --- | --- | --- | --- | --- | | KK | 2.033 | 1.497 | 3.053 | 0.492 | | A4s | 0.492 | 3.053 | 1.497 | 2.033 | 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. KK does best on low rainbow flops (nine high or lower), at 72.65%, and worst on monotone flops, at 62.72%. KK stays ahead on all five textures. **KK against A4s by flop texture, in percent** | Flop | Share of flops | KK wins | Ties | A4s wins | KK equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 66.979 | 0.198 | 32.823 | 67.078 | | Rainbow, nine or lower | 7.042 | 72.033 | 1.226 | 26.741 | 72.646 | | Two-tone | 46.545 | 64.975 | 0.397 | 34.628 | 65.173 | | Monotone | 5.212 | 61.491 | 2.459 | 36.050 | 62.720 | | Paired | 17.334 | 70.930 | 0.010 | 29.060 | 70.935 | 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 The table below sets each hand against its own random-hand baseline: a change of -15.37 points for KK, from 82.40%, and -26.06 for A4s, from 59.03%. **KK 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 | | --- | --- | --- | --- | --- | | KK, all flops | 67.025 | 82.396 | -15.371 | 0.81345 | | KK, rainbow, ten or higher | 67.078 | 82.396 | -15.318 | 0.81409 | | KK, rainbow, nine or lower | 72.646 | 82.396 | -9.750 | 0.88167 | | KK, two-tone | 65.173 | 82.396 | -17.223 | 0.79097 | | KK, monotone | 62.720 | 82.396 | -19.676 | 0.76120 | | KK, paired | 70.935 | 82.396 | -11.461 | 0.86090 | | A4s, all flops | 32.975 | 59.034 | -26.059 | 0.55858 | | A4s, rainbow, ten or higher | 32.922 | 59.034 | -26.112 | 0.55768 | | A4s, rainbow, nine or lower | 27.354 | 59.034 | -31.680 | 0.46336 | | A4s, two-tone | 34.827 | 59.034 | -24.207 | 0.58995 | | A4s, monotone | 37.280 | 59.034 | -21.754 | 0.63150 | | A4s, paired | 29.065 | 59.034 | -29.969 | 0.49234 | ## Does a shared suit matter? Looking only at deals where the hands share a suit, KK has 67.31%; looking only at deals where they do not, 66.74%. KK does better with a shared suit, by 0.57 points. **KK against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KK wins | Ties | A4s wins | KK equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 67.066 | 0.489 | 32.445 | 67.310 | | No shared suit | 12 | 50.00 | 66.537 | 0.407 | 33.056 | 66.740 | ## How often this matchup comes up The class pair covers 24 combinations of specific cards in a fixed seat order, 0.0015% of 1,624,350, and 48 (0.0030%) in either order. ## A worked example Take a $200 pot built from $100 each. KK's equity of 67.03% is worth $134.06, a $34.06 edge, and A4s' 32.97% is worth $65.94, which is $34.06 under its stake. Scaled to 1,000 deals, that is roughly 668 wins for KK, 328 for A4s and 4 chopped pots. ## The same matchup from the other side A4s versus KK is this same page seen from the other hand: 32.97% for A4s, 67.03% for KK. ## Keep exploring KsKh against Ad4d is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open KsKh against Ad4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsKh&p2=Ad4d) - [KK combos](https://georgelipoker.com/combos/kk.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [KK vs A3s](https://georgelipoker.com/equity/kk-vs-a3s.md) - [KK vs QJo](https://georgelipoker.com/equity/kk-vs-qjo.md) - [QQ vs A4s](https://georgelipoker.com/equity/qq-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 24 specific deals of KK 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 - [KK vs A3s: preflop equity](https://georgelipoker.com/equity/kk-vs-a3s.md) - [KK vs QJo: preflop equity](https://georgelipoker.com/equity/kk-vs-qjo.md) - [QQ vs A4s: preflop equity](https://georgelipoker.com/equity/qq-vs-a4s.md)