--- title: "A5s vs A4s: preflop equity" url: "https://georgelipoker.com/equity/a5s-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/a5s-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A5s or A4s? A5s leads 55.09% to 44.91% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a5s-vs-a3s.md", "https://georgelipoker.com/equity/a5s-vs-qjo.md", "https://georgelipoker.com/equity/a6s-vs-a4s.md"] --- # A5s vs A4s: preflop equity Who is ahead, A5s or A4s? A5s leads 55.09% to 44.91% before the flop, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, A5s holds 55.09% equity against A4s, which leaves A4s with 44.91%. ## A5s against A4s: the numbers **Exact preflop results for A5s against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A5s | 35.608 | 38.962 | 25.430 | 55.089 | | A4s | 25.430 | 38.962 | 35.608 | 44.911 | A5s and A4s are both suited hands. The two hands share a rank, and the one with the better other card dominates: it wins most kicker battles when that shared rank hits. The lead is steady rather than large, and the flop still has plenty of say in who wins. About 38.96% of boards chop the pot, which is why equity sits slightly above the win figure for both hands. For context, A5s sits at number 30 of 169 starting hands and A4s at number 35 when each is run against a random hand. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A5s | 7,317,000 | 8,006,000 | 5,225,000 | | A4s | 5,225,000 | 8,006,000 | 7,317,000 | The total is exact: 12 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. **A5s 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) | | --- | --- | --- | --- | --- | | A5s | 1.227 | 2.808 | 3.932 | 0.815 | | A4s | 0.815 | 3.932 | 2.808 | 1.227 | 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 Across the five flop textures A5s' equity moves by 7.45 points, from 52.34% on paired flops to 59.79% on low rainbow flops (nine high or lower). A5s stays ahead on all five textures. **A5s against A4s by flop texture, in percent** | Flop | Share of flops | A5s wins | Ties | A4s wins | A5s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.526 | 33.216 | 44.147 | 22.637 | 55.289 | | Rainbow, nine or lower | 6.383 | 47.973 | 23.626 | 28.401 | 59.786 | | Two-tone | 46.543 | 38.061 | 34.815 | 27.124 | 55.469 | | Monotone | 5.215 | 40.484 | 27.282 | 32.234 | 54.125 | | Paired | 17.333 | 26.382 | 51.923 | 21.695 | 52.343 | 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 How much does the opponent matter? Compared with its random-hand 59.92%, A5s changes by -4.83 points, and A4s, from 59.03%, by -14.12. **A5s 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 | | --- | --- | --- | --- | --- | | A5s, all flops | 55.089 | 59.923 | -4.834 | 0.91933 | | A5s, rainbow, ten or higher | 55.289 | 59.923 | -4.634 | 0.92267 | | A5s, rainbow, nine or lower | 59.786 | 59.923 | -0.137 | 0.99771 | | A5s, two-tone | 55.469 | 59.923 | -4.454 | 0.92567 | | A5s, monotone | 54.125 | 59.923 | -5.798 | 0.90324 | | A5s, paired | 52.343 | 59.923 | -7.580 | 0.87350 | | A4s, all flops | 44.911 | 59.034 | -14.123 | 0.76076 | | A4s, rainbow, ten or higher | 44.711 | 59.034 | -14.323 | 0.75738 | | A4s, rainbow, nine or lower | 40.214 | 59.034 | -18.820 | 0.68120 | | A4s, two-tone | 44.531 | 59.034 | -14.503 | 0.75433 | | A4s, monotone | 45.875 | 59.034 | -13.159 | 0.77709 | | A4s, paired | 47.657 | 59.034 | -11.377 | 0.80728 | ## Does a shared suit matter? These two classes cannot share a suit in any legal deal, so there is only one row to read: A5s holds 55.09% in every deal of this matchup. **A5s against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | A5s wins | Ties | A4s wins | A5s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 35.608 | 38.962 | 25.430 | 55.089 | ## How often this matchup comes up Out of 1,624,350 ways to deal two seats two cards each, 12 are A5s in one seat and A4s in the other (0.0007%); with the seats swapped too, 24 (0.0015%). ## A worked example Try it with money: two players each put in $100 and the whole board runs out every possible way. A5s averages $110.18 from the $200, up $10.18; A4s averages $89.82, down $10.18. Think in thousands: about 356 of 1,000 go to A5s, about 254 go to A4s, and about 390 are chopped. ## The same matchup from the other side One page covers both views. From A4s' side the equity is 44.91%, and from A5s' side it is 55.09%. ## Keep exploring The calculator link fills in As5s against Ah4h, a deal where the two hands share no suit. Change any card to test your own hand. The neighboring matchups below swap one of the two hands for one of similar strength. - [Open As5s against Ah4h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As5s&p2=Ah4h) - [A5s combos](https://georgelipoker.com/combos/a5s.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [A5s vs A3s](https://georgelipoker.com/equity/a5s-vs-a3s.md) - [A5s vs QJo](https://georgelipoker.com/equity/a5s-vs-qjo.md) - [A6s vs A4s](https://georgelipoker.com/equity/a6s-vs-a4s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 12 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A5s vs A3s: preflop equity](https://georgelipoker.com/equity/a5s-vs-a3s.md) - [A5s vs QJo: preflop equity](https://georgelipoker.com/equity/a5s-vs-qjo.md) - [A6s vs A4s: preflop equity](https://georgelipoker.com/equity/a6s-vs-a4s.md)