---
title: "A2s vs 64s: preflop equity"
url: "https://georgelipoker.com/equity/a2s-vs-64s.md"
canonical_url: "https://georgelipoker.com/equity/a2s-vs-64s"
last_updated: "2026-10-23"
type: "reference"
summary: "Who is ahead, A2s or 64s? A2s leads 56.57% to 43.43% before the flop, counted exactly over every board, with the split by flop type and suit."
related: ["https://georgelipoker.com/equity/a2s-vs-53s.md", "https://georgelipoker.com/equity/a2s-vs-43s.md", "https://georgelipoker.com/equity/qto-vs-64s.md"]
---

# A2s vs 64s: preflop equity

Who is ahead, A2s or 64s? A2s leads 56.57% to 43.43% before the flop, counted exactly over every board, with the split by flop type and suit.

The exact count puts A2s at 56.57% and 64s at 43.43% when the two hands see all five board cards.

## A2s against 64s: the numbers

**Exact preflop results for A2s against 64s, in percent**

| Hand | Wins | Ties | Loses | Equity |
| --- | --- | --- | --- | --- |
| A2s | 56.278 | 0.586 | 43.136 | 56.571 |
| 64s | 43.136 | 0.586 | 56.278 | 43.429 |

This is a contest between two suited hands, A2s and 64s. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits.

That is a modest edge, the kind that shows up over many hands and is easy to miss in one. Split pots make up 0.59% of the boards, and both equity figures count them as half a win each.

In the ranking of all 169 starting hands, A2s is number 46 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 |
| --- | --- | --- | --- |
| A2s | 15,418,000 | 161,000 | 11,818,000 |
| 64s | 11,818,000 | 161,000 | 15,418,000 |

Exact total: 16 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.

**A2s 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) |
| --- | --- | --- | --- | --- |
| A2s | 1.303 | 1.777 | 2.318 | 0.768 |
| 64s | 0.768 | 2.318 | 1.777 | 1.303 |

In the last column, a pot-to-call ratio at or above the figure makes a call break even or better at this equity.

## Who is ahead on which flops

If you know the kind of flop that came, the numbers shift: A2s holds 62.90% on paired flops and 33.50% on low rainbow flops (nine high or lower). The overall edge for A2s hides low rainbow flops (nine high or lower), where 64s comes out in front.

**A2s against 64s by flop texture, in percent**

| Flop | Share of flops | A2s wins | Ties | 64s wins | A2s equity |
| --- | --- | --- | --- | --- | --- |
| Rainbow, ten or higher | 25.220 | 60.409 | 0.255 | 39.336 | 60.537 |
| Rainbow, nine or lower | 5.689 | 33.013 | 0.982 | 66.005 | 33.504 |
| Two-tone | 46.727 | 55.032 | 0.345 | 44.623 | 55.205 |
| Monotone | 5.273 | 52.334 | 3.517 | 44.149 | 54.093 |
| Paired | 17.091 | 62.551 | 0.698 | 36.751 | 62.900 |

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

How much does the opponent matter? Compared with its random-hand 57.38%, A2s changes by -0.81 points, and 64s, from 41.33%, by +2.10.

**A2s 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 |
| --- | --- | --- | --- | --- |
| A2s, all flops | 56.571 | 57.379 | -0.808 | 0.98592 |
| A2s, rainbow, ten or higher | 60.537 | 57.379 | +3.158 | 1.05504 |
| A2s, rainbow, nine or lower | 33.504 | 57.379 | -23.875 | 0.58391 |
| A2s, two-tone | 55.205 | 57.379 | -2.174 | 0.96211 |
| A2s, monotone | 54.093 | 57.379 | -3.286 | 0.94273 |
| A2s, paired | 62.900 | 57.379 | +5.521 | 1.09622 |
| 64s, all flops | 43.429 | 41.333 | +2.096 | 1.05071 |
| 64s, rainbow, ten or higher | 39.463 | 41.333 | -1.870 | 0.95476 |
| 64s, rainbow, nine or lower | 66.496 | 41.333 | +25.163 | 1.60879 |
| 64s, two-tone | 44.795 | 41.333 | +3.462 | 1.08376 |
| 64s, monotone | 45.907 | 41.333 | +4.574 | 1.11066 |
| 64s, paired | 37.100 | 41.333 | -4.233 | 0.89759 |

## Does a shared suit matter?

Split by suits, the deals give A2s 58.38% when the hands overlap in a suit and 55.97% when they do not. A2s does better with a shared suit, by 2.41 points.

**A2s against 64s by suit overlap, in percent**

| Deals | Specific deals | Share of deals | A2s wins | Ties | 64s wins | A2s equity |
| --- | --- | --- | --- | --- | --- | --- |
| Share a suit | 4 | 25.00 | 58.041 | 0.670 | 41.289 | 58.376 |
| No shared suit | 12 | 75.00 | 55.691 | 0.558 | 43.751 | 55.970 |

## How often this matchup comes up

You will meet this exact matchup 0.0020% of the time in a random heads-up deal: 32 of 1,624,350, counting either seat order.

## A worked example

Put $100 each into a $200 pot and deal every board once: A2s averages $113.14 back, ahead of its $100 by $13.14, while 64s averages $86.86, short of its $100 by $13.14.

Scaled to 1,000 deals, that is roughly 563 wins for A2s, 431 for 64s and 6 chopped pots.

## The same matchup from the other side

64s against A2s adds nothing new: it is 43.43% for 64s and 56.57% for A2s, the same figures reversed.

## Keep exploring

Try As2s against 6h4h 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 As2s against 6h4h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As2s&p2=6h4h)
- [A2s combos](https://georgelipoker.com/combos/a2s.md)
- [64s combos](https://georgelipoker.com/combos/64s.md)
- [A2s vs 53s](https://georgelipoker.com/equity/a2s-vs-53s.md)
- [A2s vs 43s](https://georgelipoker.com/equity/a2s-vs-43s.md)
- [QTo vs 64s](https://georgelipoker.com/equity/qto-vs-64s.md)
- [All hand matchups](https://georgelipoker.com/equity.md)

## How this was computed

This is an exact count with no sampling. For the 16 ways to deal one A2s and one 64s without reusing a card, grouped by suit pattern, every one of the 1,712,304 possible boards is dealt and both seven-card hands are compared. A tie counts as half a win in the equity column, and each board is counted once under each of its ten three-card flops.

Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used.

## Related

- [A2s vs 53s: preflop equity](https://georgelipoker.com/equity/a2s-vs-53s.md)
- [A2s vs 43s: preflop equity](https://georgelipoker.com/equity/a2s-vs-43s.md)
- [QTo vs 64s: preflop equity](https://georgelipoker.com/equity/qto-vs-64s.md)