--- title: "55 vs A2s: preflop equity" url: "https://georgelipoker.com/equity/55-vs-a2s.md" canonical_url: "https://georgelipoker.com/equity/55-vs-a2s" last_updated: "2026-10-23" type: "reference" summary: "55 is a big favorite over A2s before the flop: 66.67% to 33.33% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/55-vs-qto.md", "https://georgelipoker.com/equity/55-vs-44.md", "https://georgelipoker.com/equity/qjs-vs-a2s.md"] --- # 55 vs A2s: preflop equity 55 is a big favorite over A2s before the flop: 66.67% to 33.33% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, 55 is ahead of A2s by 33.34 points of equity, 66.67% to 33.33%. ## 55 against A2s: the numbers **Exact preflop results for 55 against A2s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 55 | 66.400 | 0.541 | 33.059 | 66.670 | | A2s | 33.059 | 0.541 | 66.400 | 33.330 | The first hand is a pocket pair; the second is a suited hand. The pair sits between the other hand's two cards: one is higher and one is lower, so the pair is exposed to the higher card. That is a clear edge, 66.67% to 33.33%, but A2s still wins often enough that one hand proves nothing. The tie share is 0.54%: on those boards the pot is chopped and neither hand wins outright. Ranked by equity against a random hand, 55 is number 27 of the 169 starting hands and A2s is number 46. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 55 | 27,287,000 | 222,000 | 13,586,000 | | A2s | 13,586,000 | 222,000 | 27,287,000 | The board total is exact, 24 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **55 against A2s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | 55 | 2.000 | 1.506 | 3.025 | 0.500 | | A2s | 0.500 | 3.025 | 1.506 | 2.000 | 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 If you know the kind of flop that came, the numbers shift: 55 holds 82.08% on low rainbow flops (nine high or lower) and 62.97% on monotone flops. 55 stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **55 against A2s by flop texture, in percent** | Flop | Share of flops | 55 wins | Ties | A2s wins | 55 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 66.227 | 0.291 | 33.482 | 66.372 | | Rainbow, nine or lower | 5.689 | 81.613 | 0.940 | 17.447 | 82.083 | | Two-tone | 46.545 | 65.755 | 0.373 | 33.872 | 65.942 | | Monotone | 5.212 | 61.646 | 2.641 | 35.713 | 62.966 | | Paired | 17.334 | 64.820 | 0.592 | 34.588 | 65.116 | 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 Against one random hand instead, 55 holds 60.33% and A2s holds 57.38%. Facing each other changes that by +6.34 points for 55 and -24.05 points for A2s. **55 and A2s 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 | | --- | --- | --- | --- | --- | | 55, all flops | 66.670 | 60.325 | +6.345 | 1.10518 | | 55, rainbow, ten or higher | 66.372 | 60.325 | +6.047 | 1.10024 | | 55, rainbow, nine or lower | 82.083 | 60.325 | +21.758 | 1.36068 | | 55, two-tone | 65.942 | 60.325 | +5.617 | 1.09311 | | 55, monotone | 62.966 | 60.325 | +2.641 | 1.04378 | | 55, paired | 65.116 | 60.325 | +4.791 | 1.07942 | | A2s, all flops | 33.330 | 57.379 | -24.049 | 0.58087 | | A2s, rainbow, ten or higher | 33.628 | 57.379 | -23.751 | 0.58607 | | A2s, rainbow, nine or lower | 17.917 | 57.379 | -39.462 | 0.31226 | | A2s, two-tone | 34.058 | 57.379 | -23.321 | 0.59356 | | A2s, monotone | 37.034 | 57.379 | -20.345 | 0.64543 | | A2s, paired | 34.884 | 57.379 | -22.495 | 0.60796 | ## Does a shared suit matter? The suit split reads 66.96% for 55 with a shared suit and 66.39% without one. 55 does better with a shared suit, by 0.57 points. **55 against A2s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 55 wins | Ties | A2s wins | 55 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 66.664 | 0.582 | 32.754 | 66.955 | | No shared suit | 12 | 50.00 | 66.136 | 0.499 | 33.365 | 66.386 | ## How often this matchup comes up 55 against A2s is made up of 24 specific-card matchups in one seat order, 0.0015% of the 1,624,350 ordered deals, and 48 counting both seat orders, 0.0030%. ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. 55 is worth $133.34 on average (+$33.34); A2s is worth $66.66 (-$33.34). Out of 1,000 deals you should see around 664 outright wins for 55, 331 for A2s, and 5 split pots. ## The same matchup from the other side Read it from the other side: A2s against 55 is the same matchup with the numbers swapped, so A2s holds 33.33% and 55 holds 66.67%. That address sends you back to this page. ## Keep exploring Try 5s5h against Ad2d 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 5s5h against Ad2d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=5s5h&p2=Ad2d) - [55 combos](https://georgelipoker.com/combos/55.md) - [A2s combos](https://georgelipoker.com/combos/a2s.md) - [55 vs QTo](https://georgelipoker.com/equity/55-vs-qto.md) - [55 vs 44](https://georgelipoker.com/equity/55-vs-44.md) - [QJs vs A2s](https://georgelipoker.com/equity/qjs-vs-a2s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 24 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [55 vs QTo: preflop equity](https://georgelipoker.com/equity/55-vs-qto.md) - [55 vs 44: preflop equity](https://georgelipoker.com/equity/55-vs-44.md) - [QJs vs A2s: preflop equity](https://georgelipoker.com/equity/qjs-vs-a2s.md)