--- title: "ATo vs 64s: preflop equity" url: "https://georgelipoker.com/equity/ato-vs-64s.md" canonical_url: "https://georgelipoker.com/equity/ato-vs-64s" last_updated: "2026-10-23" type: "reference" summary: "ATo is a big favorite over 64s before the flop: 60.25% to 39.75% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ato-vs-53s.md", "https://georgelipoker.com/equity/ato-vs-43s.md", "https://georgelipoker.com/equity/kjs-vs-64s.md"] --- # ATo vs 64s: preflop equity ATo is a big favorite over 64s before the flop: 60.25% to 39.75% equity, counted exactly over every board, with the split by flop type and suit. Counting every board, the equity split is 60.25% for ATo and 39.75% for 64s, so ATo leads by 20.50 points. ## ATo against 64s: the numbers **Exact preflop results for ATo against 64s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATo | 60.021 | 0.464 | 39.515 | 60.253 | | 64s | 39.515 | 0.464 | 60.021 | 39.747 | The matchup pits an offsuit hand against a suited hand. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. ATo is ahead, but 64s is far from dead: it takes 395 of every 1,000 deals outright. A split pot comes up on 0.46% of boards, so the wins and the equity differ by half of that. ATo ranks number 19 of 169 starting hands, and 64s ranks number 138, 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 | | --- | --- | --- | --- | | ATo | 49,332,000 | 381,000 | 32,478,000 | | 64s | 32,478,000 | 381,000 | 49,332,000 | Exact total: 48 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **ATo against 64s 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 | 1.516 | 1.666 | 2.531 | 0.660 | | 64s | 0.660 | 2.531 | 1.666 | 1.516 | 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. ATo does best on rainbow flops topped by a ten or better, at 68.41%, and worst on low rainbow flops (nine high or lower), at 34.02%. Low rainbow flops (nine high or lower) favor 64s, the hand that is behind overall. **ATo against 64s by flop texture, in percent** | Flop | Share of flops | ATo wins | Ties | 64s wins | ATo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.717 | 68.305 | 0.203 | 31.492 | 68.406 | | Rainbow, nine or lower | 6.313 | 33.679 | 0.677 | 65.644 | 34.018 | | Two-tone | 46.667 | 58.447 | 0.281 | 41.272 | 58.588 | | Monotone | 5.212 | 57.242 | 2.415 | 40.343 | 58.450 | | Paired | 17.091 | 62.917 | 0.665 | 36.418 | 63.249 | 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 The table below sets each hand against its own random-hand baseline: a change of -2.47 points for ATo, from 62.72%, and -1.58 for 64s, from 41.33%. **ATo and 64s 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 | 60.253 | 62.722 | -2.469 | 0.96064 | | ATo, rainbow, ten or higher | 68.406 | 62.722 | +5.684 | 1.09062 | | ATo, rainbow, nine or lower | 34.018 | 62.722 | -28.704 | 0.54236 | | ATo, two-tone | 58.588 | 62.722 | -4.134 | 0.93409 | | ATo, monotone | 58.450 | 62.722 | -4.272 | 0.93189 | | ATo, paired | 63.249 | 62.722 | +0.527 | 1.00840 | | 64s, all flops | 39.747 | 41.333 | -1.586 | 0.96163 | | 64s, rainbow, ten or higher | 31.594 | 41.333 | -9.739 | 0.76438 | | 64s, rainbow, nine or lower | 65.982 | 41.333 | +24.649 | 1.59635 | | 64s, two-tone | 41.412 | 41.333 | +0.079 | 1.00191 | | 64s, monotone | 41.550 | 41.333 | +0.217 | 1.00525 | | 64s, paired | 36.751 | 41.333 | -4.582 | 0.88914 | ## Does a shared suit matter? Split by suits, the deals give ATo 60.96% when the hands overlap in a suit and 59.55% when they do not. ATo does better with a shared suit, by 1.41 points. **ATo against 64s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATo wins | Ties | 64s wins | ATo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 60.708 | 0.505 | 38.787 | 60.961 | | No shared suit | 24 | 50.00 | 59.334 | 0.422 | 40.244 | 59.545 | ## How often this matchup comes up ATo against 64s is made up of 48 specific-card matchups in one seat order, 0.0030% of the 1,624,350 ordered deals, and 96 counting both seat orders, 0.0059%. ## A worked example Take a $200 pot built from $100 each. ATo's equity of 60.25% is worth $120.50, a $20.50 edge, and 64s' 39.75% is worth $79.50, which is $20.50 under its stake. Run 1,000 deals and the tally comes out near 600 for ATo, 395 for 64s and 5 ties. ## The same matchup from the other side 64s versus ATo is this same page seen from the other hand: 39.75% for 64s, 60.25% for ATo. ## Keep exploring Try AsTh against 6d4d 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 6d4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTh&p2=6d4d) - [ATo combos](https://georgelipoker.com/combos/ato.md) - [64s combos](https://georgelipoker.com/combos/64s.md) - [ATo vs 53s](https://georgelipoker.com/equity/ato-vs-53s.md) - [ATo vs 43s](https://georgelipoker.com/equity/ato-vs-43s.md) - [KJs vs 64s](https://georgelipoker.com/equity/kjs-vs-64s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 48 specific ATo against 64s deals meets all 1,712,304 boards, and the better five-card hand wins; a split pot is half a win each. The flop table reads each board under all ten of its three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATo vs 53s: preflop equity](https://georgelipoker.com/equity/ato-vs-53s.md) - [ATo vs 43s: preflop equity](https://georgelipoker.com/equity/ato-vs-43s.md) - [KJs vs 64s: preflop equity](https://georgelipoker.com/equity/kjs-vs-64s.md)