--- title: "ATo vs A5s: preflop equity" url: "https://georgelipoker.com/equity/ato-vs-a5s.md" canonical_url: "https://georgelipoker.com/equity/ato-vs-a5s" last_updated: "2026-10-23" type: "reference" summary: "ATo is a big favorite over A5s before the flop: 66.11% to 33.89% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ato-vs-a6s.md", "https://georgelipoker.com/equity/ato-vs-kto.md", "https://georgelipoker.com/equity/kjs-vs-a5s.md"] --- # ATo vs A5s: preflop equity ATo is a big favorite over A5s before the flop: 66.11% to 33.89% equity, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, ATo holds 66.11% equity against A5s, which leaves A5s with 33.89%. ## ATo against A5s: the numbers **Exact preflop results for ATo against A5s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATo | 60.998 | 10.221 | 28.781 | 66.109 | | A5s | 28.781 | 10.221 | 60.998 | 33.891 | ATo and A5s are an offsuit hand and a suited hand, in that order. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing. A lead of 32.22 points is large but not decisive: A5s still takes about 288 of every 1,000 deals. Ties are 10.22% of the outcomes here; each tied board gives both hands half the pot. In the ranking of all 169 starting hands, ATo is number 19 and A5s is number 30. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATo | 37,601,000 | 6,301,000 | 17,741,000 | | A5s | 17,741,000 | 6,301,000 | 37,601,000 | 36 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand. **ATo against A5s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | ATo | 1.951 | 1.639 | 3.475 | 0.513 | | A5s | 0.513 | 3.475 | 1.639 | 1.951 | 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 Split by what the flop looks like, ATo peaks at 73.34% on rainbow flops topped by a ten or better and bottoms out at 54.33% on low rainbow flops (nine high or lower). ATo stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **ATo against A5s by flop texture, in percent** | Flop | Share of flops | ATo wins | Ties | A5s wins | ATo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.905 | 69.040 | 8.603 | 22.357 | 73.341 | | Rainbow, nine or lower | 7.042 | 52.335 | 3.990 | 43.675 | 54.330 | | Two-tone | 46.527 | 61.886 | 7.141 | 30.973 | 65.457 | | Monotone | 5.192 | 58.310 | 7.576 | 34.114 | 62.098 | | Paired | 17.334 | 51.846 | 24.046 | 24.108 | 63.869 | 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 How much does the opponent matter? Compared with its random-hand 62.72%, ATo changes by +3.39 points, and A5s, from 59.92%, by -26.03. **ATo and A5s 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 | | --- | --- | --- | --- | --- | | ATo, all flops | 66.109 | 62.722 | +3.387 | 1.05400 | | ATo, rainbow, ten or higher | 73.341 | 62.722 | +10.619 | 1.16930 | | ATo, rainbow, nine or lower | 54.330 | 62.722 | -8.392 | 0.86620 | | ATo, two-tone | 65.457 | 62.722 | +2.735 | 1.04361 | | ATo, monotone | 62.098 | 62.722 | -0.624 | 0.99005 | | ATo, paired | 63.869 | 62.722 | +1.147 | 1.01829 | | A5s, all flops | 33.891 | 59.923 | -26.032 | 0.56558 | | A5s, rainbow, ten or higher | 26.659 | 59.923 | -33.264 | 0.44489 | | A5s, rainbow, nine or lower | 45.670 | 59.923 | -14.253 | 0.76214 | | A5s, two-tone | 34.543 | 59.923 | -25.380 | 0.57646 | | A5s, monotone | 37.902 | 59.923 | -22.021 | 0.63251 | | A5s, paired | 36.131 | 59.923 | -23.792 | 0.60296 | ## Does a shared suit matter? When the hands share a suit, ATo holds 66.91%; when they do not, it holds 65.71%. ATo does better with a shared suit, by 1.20 points. **ATo against A5s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATo wins | Ties | A5s wins | ATo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 33.33 | 61.730 | 10.352 | 27.918 | 66.906 | | No shared suit | 24 | 66.67 | 60.632 | 10.156 | 29.212 | 65.710 | ## How often this matchup comes up ATo against A5s is made up of 36 specific-card matchups in one seat order, 0.0022% of the 1,624,350 ordered deals, and 72 counting both seat orders, 0.0044%. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, ATo's average share is $132.22 (a gain of $32.22) and A5s' is $67.78 (a loss of $32.22). A thousand deals look like this: ATo takes 610, A5s takes 288, 102 are ties. ## The same matchup from the other side Read it from the other side: A5s against ATo is the same matchup with the numbers swapped, so A5s holds 33.89% and ATo holds 66.11%. That address sends you back to this page. ## Keep exploring Try AsTh against Ad5d 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 AsTh against Ad5d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTh&p2=Ad5d) - [ATo combos](https://georgelipoker.com/combos/ato.md) - [A5s combos](https://georgelipoker.com/combos/a5s.md) - [ATo vs A6s](https://georgelipoker.com/equity/ato-vs-a6s.md) - [ATo vs KTo](https://georgelipoker.com/equity/ato-vs-kto.md) - [KJs vs A5s](https://georgelipoker.com/equity/kjs-vs-a5s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 36 deals of ATo against A5s fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATo vs A6s: preflop equity](https://georgelipoker.com/equity/ato-vs-a6s.md) - [ATo vs KTo: preflop equity](https://georgelipoker.com/equity/ato-vs-kto.md) - [KJs vs A5s: preflop equity](https://georgelipoker.com/equity/kjs-vs-a5s.md)