---
title: "A4s vs 64s: preflop equity"
url: "https://georgelipoker.com/equity/a4s-vs-64s.md"
canonical_url: "https://georgelipoker.com/equity/a4s-vs-64s"
last_updated: "2026-10-23"
type: "reference"
summary: "A4s is a big favorite over 64s before the flop: 68.17% to 31.83% equity, counted exactly over every board, with the split by flop type and suit."
related: ["https://georgelipoker.com/equity/a4s-vs-53s.md", "https://georgelipoker.com/equity/a4s-vs-43s.md", "https://georgelipoker.com/equity/a3s-vs-64s.md"]
---

# A4s vs 64s: preflop equity

A4s is a big favorite over 64s before the flop: 68.17% to 31.83% equity, counted exactly over every board, with the split by flop type and suit.

In equity, A4s against 64s stands at 68.17% to 31.83%, a gap of 36.34 points.

## A4s against 64s: the numbers

**Exact preflop results for A4s against 64s, in percent**

| Hand | Wins | Ties | Loses | Equity |
| --- | --- | --- | --- | --- |
| A4s | 67.286 | 1.773 | 30.941 | 68.173 |
| 64s | 30.941 | 1.773 | 67.286 | 31.827 |

A4s and 64s 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.

A lead of 36.34 points is large but not decisive: 64s still takes about 309 of every 1,000 deals. The tie share is 1.77%: on those boards the pot is chopped and neither hand wins outright.

A4s ranks number 35 of 169 starting hands, and 64s ranks number 138, by equity against a random hand.

**Boards behind the percentages: 20,547,648 counted in all**

| Hand | Boards won, about | Boards tied, about | Boards lost, about |
| --- | --- | --- | --- |
| A4s | 13,826,000 | 364,000 | 6,358,000 |
| 64s | 6,358,000 | 364,000 | 13,826,000 |

Exact total: 12 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.

**A4s 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) |
| --- | --- | --- | --- | --- |
| A4s | 2.142 | 1.486 | 3.232 | 0.467 |
| 64s | 0.467 | 3.232 | 1.486 | 2.142 |

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. A4s does best on rainbow flops topped by a ten or better, at 73.34%, and worst on low rainbow flops (nine high or lower), at 49.20%. The lead reverses on low rainbow flops (nine high or lower): there 64s is the favorite even though A4s is ahead overall.

**A4s against 64s by flop texture, in percent**

| Flop | Share of flops | A4s wins | Ties | 64s wins | A4s equity |
| --- | --- | --- | --- | --- | --- |
| Rainbow, ten or higher | 25.254 | 72.899 | 0.881 | 26.220 | 73.339 |
| Rainbow, nine or lower | 5.654 | 46.656 | 5.083 | 48.261 | 49.198 |
| Two-tone | 46.543 | 65.904 | 1.444 | 32.652 | 66.626 |
| Monotone | 5.215 | 59.976 | 4.016 | 36.008 | 61.984 |
| Paired | 17.334 | 71.751 | 2.199 | 26.050 | 72.851 |

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

Compared with a random opponent, this matchup shifts A4s from 59.03% by +9.14 points and 64s from 41.33% by -9.50 points.

**A4s 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 |
| --- | --- | --- | --- | --- |
| A4s, all flops | 68.173 | 59.034 | +9.139 | 1.15481 |
| A4s, rainbow, ten or higher | 73.339 | 59.034 | +14.305 | 1.24232 |
| A4s, rainbow, nine or lower | 49.198 | 59.034 | -9.836 | 0.83338 |
| A4s, two-tone | 66.626 | 59.034 | +7.592 | 1.12860 |
| A4s, monotone | 61.984 | 59.034 | +2.950 | 1.04997 |
| A4s, paired | 72.851 | 59.034 | +13.817 | 1.23405 |
| 64s, all flops | 31.827 | 41.333 | -9.506 | 0.77001 |
| 64s, rainbow, ten or higher | 26.661 | 41.333 | -14.672 | 0.64503 |
| 64s, rainbow, nine or lower | 50.802 | 41.333 | +9.469 | 1.22909 |
| 64s, two-tone | 33.374 | 41.333 | -7.959 | 0.80744 |
| 64s, monotone | 38.016 | 41.333 | -3.317 | 0.91975 |
| 64s, paired | 27.149 | 41.333 | -14.184 | 0.65684 |

## Does a shared suit matter?

A shared suit is impossible for this matchup, so A4s' 68.17% is the answer for every suit pattern.

**A4s against 64s by suit overlap, in percent**

| Deals | Specific deals | Share of deals | A4s wins | Ties | 64s wins | A4s equity |
| --- | --- | --- | --- | --- | --- | --- |
| Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible |
| No shared suit | 12 | 100.00 | 67.286 | 1.773 | 30.941 | 68.173 |

## How often this matchup comes up

Counting specific cards, A4s against 64s appears in 12 of the 1,624,350 ordered heads-up deals (0.0007%), and in 24 when the seats are swapped too (0.0015%).

## A worked example

With $100 from each side, the $200 pot is split on average as $136.34 for A4s and $63.66 for 64s; the first side gains $36.34 per all-in and the second gives up $36.34.

Per 1,000 deals: A4s wins about 673, 64s wins about 309, and about 18 end in a split pot.

## The same matchup from the other side

64s against A4s adds nothing new: it is 31.83% for 64s and 68.17% for A4s, the same figures reversed.

## Keep exploring

Open the calculator with As4s against 6h4h already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking.

- [Open As4s against 6h4h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As4s&p2=6h4h)
- [A4s combos](https://georgelipoker.com/combos/a4s.md)
- [64s combos](https://georgelipoker.com/combos/64s.md)
- [A4s vs 53s](https://georgelipoker.com/equity/a4s-vs-53s.md)
- [A4s vs 43s](https://georgelipoker.com/equity/a4s-vs-43s.md)
- [A3s vs 64s](https://georgelipoker.com/equity/a3s-vs-64s.md)
- [All hand matchups](https://georgelipoker.com/equity.md)

## How this was computed

We counted every case. Each suit pattern of the 12 specific A4s 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

- [A4s vs 53s: preflop equity](https://georgelipoker.com/equity/a4s-vs-53s.md)
- [A4s vs 43s: preflop equity](https://georgelipoker.com/equity/a4s-vs-43s.md)
- [A3s vs 64s: preflop equity](https://georgelipoker.com/equity/a3s-vs-64s.md)