--- title: "ATs vs 64s: preflop equity" url: "https://georgelipoker.com/equity/ats-vs-64s.md" canonical_url: "https://georgelipoker.com/equity/ats-vs-64s" last_updated: "2026-10-23" type: "reference" summary: "ATs is a big favorite over 64s before the flop: 62.79% to 37.21% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ats-vs-53s.md", "https://georgelipoker.com/equity/ats-vs-43s.md", "https://georgelipoker.com/equity/aqo-vs-64s.md"] --- # ATs vs 64s: preflop equity ATs is a big favorite over 64s before the flop: 62.79% to 37.21% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, ATs takes 62.79% of the pot on average and 64s takes the other 37.21%. ## ATs against 64s: the numbers **Exact preflop results for ATs against 64s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATs | 62.533 | 0.510 | 36.957 | 62.788 | | 64s | 36.957 | 0.510 | 62.533 | 37.212 | The matchup is suited hands on both sides, ATs against 64s. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits. ATs is ahead, but 64s is far from dead: it takes 370 of every 1,000 deals outright. 0.51% of boards are ties, so the equity of each hand is its win rate plus half of that. Ranked by equity against a random hand, ATs is number 13 of the 169 starting hands and 64s is number 138. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATs | 17,132,000 | 140,000 | 10,125,000 | | 64s | 10,125,000 | 140,000 | 17,132,000 | The total is exact: 16 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. **ATs 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) | | --- | --- | --- | --- | --- | | ATs | 1.687 | 1.599 | 2.706 | 0.593 | | 64s | 0.593 | 2.706 | 1.599 | 1.687 | 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 By flop texture, ATs' equity runs from 36.49% on low rainbow flops (nine high or lower) up to 69.73% on rainbow flops topped by a ten or better. ATs is the favorite overall but falls behind on low rainbow flops (nine high or lower). **ATs against 64s by flop texture, in percent** | Flop | Share of flops | ATs wins | Ties | 64s wins | ATs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 69.627 | 0.197 | 30.176 | 69.726 | | Rainbow, nine or lower | 6.314 | 36.169 | 0.650 | 63.181 | 36.494 | | Two-tone | 46.727 | 61.910 | 0.265 | 37.825 | 62.043 | | Monotone | 5.273 | 58.233 | 3.469 | 38.298 | 59.967 | | Paired | 17.091 | 65.095 | 0.665 | 34.240 | 65.428 | Rainbow flops have three suits, two-tone flops repeat one suit, monotone flops are all one suit, and paired flops repeat a rank. ## Compared with a random hand Relative to a random opponent, ATs changes by -1.81 points (baseline 64.60%) and 64s by -4.12 points (baseline 41.33%). **ATs 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 | | --- | --- | --- | --- | --- | | ATs, all flops | 62.788 | 64.602 | -1.814 | 0.97192 | | ATs, rainbow, ten or higher | 69.726 | 64.602 | +5.124 | 1.07932 | | ATs, rainbow, nine or lower | 36.494 | 64.602 | -28.108 | 0.56491 | | ATs, two-tone | 62.043 | 64.602 | -2.559 | 0.96039 | | ATs, monotone | 59.967 | 64.602 | -4.635 | 0.92825 | | ATs, paired | 65.428 | 64.602 | +0.826 | 1.01279 | | 64s, all flops | 37.212 | 41.333 | -4.121 | 0.90030 | | 64s, rainbow, ten or higher | 30.274 | 41.333 | -11.059 | 0.73244 | | 64s, rainbow, nine or lower | 63.506 | 41.333 | +22.173 | 1.53645 | | 64s, two-tone | 37.957 | 41.333 | -3.376 | 0.91832 | | 64s, monotone | 40.033 | 41.333 | -1.300 | 0.96855 | | 64s, paired | 34.572 | 41.333 | -6.761 | 0.83643 | ## Does a shared suit matter? Two kinds of deal exist here. In 4 of them the hands share a suit and ATs holds 65.07%. In 12 they do not, and it holds 62.03%. ATs does better with a shared suit, by 3.04 points. **ATs against 64s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATs wins | Ties | 64s wins | ATs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 64.777 | 0.589 | 34.634 | 65.072 | | No shared suit | 12 | 75.00 | 61.785 | 0.484 | 37.731 | 62.027 | ## How often this matchup comes up How often does it happen? 16 of the 1,624,350 ordered deals (0.0010%) are ATs against 64s, and 32 (0.0020%) if either hand may sit in either seat. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, ATs' average share is $125.58 (a gain of $25.58) and 64s' is $74.42 (a loss of $25.58). Over a long run, 1,000 deals split into about 625 for ATs, 370 for 64s and 5 tied. ## The same matchup from the other side The mirror image, 64s against ATs, is 37.21% to 62.79%, and its address redirects to this page. ## Keep exploring AsTs against 6h4h 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 AsTs against 6h4h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTs&p2=6h4h) - [ATs combos](https://georgelipoker.com/combos/ats.md) - [64s combos](https://georgelipoker.com/combos/64s.md) - [ATs vs 53s](https://georgelipoker.com/equity/ats-vs-53s.md) - [ATs vs 43s](https://georgelipoker.com/equity/ats-vs-43s.md) - [AQo vs 64s](https://georgelipoker.com/equity/aqo-vs-64s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 16 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATs vs 53s: preflop equity](https://georgelipoker.com/equity/ats-vs-53s.md) - [ATs vs 43s: preflop equity](https://georgelipoker.com/equity/ats-vs-43s.md) - [AQo vs 64s: preflop equity](https://georgelipoker.com/equity/aqo-vs-64s.md)