--- title: "A4s vs T9s: preflop equity" url: "https://georgelipoker.com/equity/a4s-vs-t9s.md" canonical_url: "https://georgelipoker.com/equity/a4s-vs-t9s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A4s or T9s? A4s leads 54.65% to 45.35% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a4s-vs-33.md", "https://georgelipoker.com/equity/a4s-vs-t8s.md", "https://georgelipoker.com/equity/a3s-vs-t9s.md"] --- # A4s vs T9s: preflop equity Who is ahead, A4s or T9s? A4s leads 54.65% to 45.35% before the flop, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, A4s takes 54.65% of the pot on average and T9s takes the other 45.35%. ## A4s against T9s: the numbers **Exact preflop results for A4s against T9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A4s | 54.393 | 0.506 | 45.101 | 54.646 | | T9s | 45.101 | 0.506 | 54.393 | 45.354 | The matchup is suited hands on both sides, A4s against T9s. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. This is close to even money, with A4s a little ahead. Ties are 0.51% of the outcomes here; each tied board gives both hands half the pot. Among the 169 starting hands, A4s is number 35 and T9s is number 64 by strength against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A4s | 14,902,000 | 139,000 | 12,356,000 | | T9s | 12,356,000 | 139,000 | 14,902,000 | 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. **A4s against T9s 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 | 1.205 | 1.838 | 2.217 | 0.830 | | T9s | 0.830 | 2.217 | 1.838 | 1.205 | 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 The flop changes the picture. A4s does best on paired flops, at 60.44%, and worst on low rainbow flops (nine high or lower), at 51.59%. A4s stays ahead on all five textures. **A4s against T9s by flop texture, in percent** | Flop | Share of flops | A4s wins | Ties | T9s wins | A4s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.543 | 53.971 | 0.193 | 45.836 | 54.068 | | Rainbow, nine or lower | 6.366 | 51.258 | 0.663 | 48.079 | 51.590 | | Two-tone | 46.727 | 53.319 | 0.265 | 46.416 | 53.452 | | Monotone | 5.273 | 51.104 | 3.428 | 45.468 | 52.818 | | Paired | 17.091 | 60.116 | 0.653 | 39.231 | 60.442 | 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 How much does the opponent matter? Compared with its random-hand 59.03%, A4s changes by -4.38 points, and T9s, from 54.03%, by -8.68. **A4s and T9s 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 | 54.646 | 59.034 | -4.388 | 0.92567 | | A4s, rainbow, ten or higher | 54.068 | 59.034 | -4.966 | 0.91588 | | A4s, rainbow, nine or lower | 51.590 | 59.034 | -7.444 | 0.87390 | | A4s, two-tone | 53.452 | 59.034 | -5.582 | 0.90544 | | A4s, monotone | 52.818 | 59.034 | -6.216 | 0.89470 | | A4s, paired | 60.442 | 59.034 | +1.408 | 1.02385 | | T9s, all flops | 45.354 | 54.028 | -8.674 | 0.83945 | | T9s, rainbow, ten or higher | 45.932 | 54.028 | -8.096 | 0.85015 | | T9s, rainbow, nine or lower | 48.410 | 54.028 | -5.618 | 0.89602 | | T9s, two-tone | 46.548 | 54.028 | -7.480 | 0.86155 | | T9s, monotone | 47.182 | 54.028 | -6.846 | 0.87329 | | T9s, paired | 39.558 | 54.028 | -14.470 | 0.73218 | ## Does a shared suit matter? Suit overlap shows up in the numbers. With a suit in common A4s has 56.21% equity, and with none in common it has 54.12%. A4s does better with a shared suit, by 2.09 points. **A4s against T9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | A4s wins | Ties | T9s wins | A4s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 55.920 | 0.587 | 43.493 | 56.214 | | No shared suit | 12 | 75.00 | 53.883 | 0.479 | 45.638 | 54.123 | ## How often this matchup comes up A4s against T9s is made up of 16 specific-card matchups in one seat order, 0.0010% of the 1,624,350 ordered deals, and 32 counting both seat orders, 0.0020%. ## A worked example With $100 from each side, the $200 pot is split on average as $109.30 for A4s and $90.70 for T9s; the first side gains $9.30 per all-in and the second gives up $9.30. Run 1,000 deals and the tally comes out near 544 for A4s, 451 for T9s and 5 ties. ## The same matchup from the other side If you came looking for T9s against A4s, the numbers are the same with the hands swapped: 45.35% and 54.65%. ## Keep exploring As4s against Th9h 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 As4s against Th9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As4s&p2=Th9h) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [T9s combos](https://georgelipoker.com/combos/t9s.md) - [A4s vs 33](https://georgelipoker.com/equity/a4s-vs-33.md) - [A4s vs T8s](https://georgelipoker.com/equity/a4s-vs-t8s.md) - [A3s vs T9s](https://georgelipoker.com/equity/a3s-vs-t9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Each figure is a complete count over boards. Take the 16 specific deals, group them by suit pattern, deal all 1,712,304 boards against each, and compare the two seven-card hands. Equity counts a tie as half a win; the flop rows use every one of a board's ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A4s vs 33: preflop equity](https://georgelipoker.com/equity/a4s-vs-33.md) - [A4s vs T8s: preflop equity](https://georgelipoker.com/equity/a4s-vs-t8s.md) - [A3s vs T9s: preflop equity](https://georgelipoker.com/equity/a3s-vs-t9s.md)