--- title: "66 vs 54s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-54s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-54s" last_updated: "2026-10-23" type: "reference" summary: "66 is a big favorite over 54s before the flop: 81.01% to 19.00% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-64s.md", "https://georgelipoker.com/equity/66-vs-53s.md", "https://georgelipoker.com/equity/a9s-vs-54s.md"] --- # 66 vs 54s: preflop equity 66 is a big favorite over 54s before the flop: 81.01% to 19.00% equity, counted exactly over every board, with the split by flop type and suit. Over all 1,712,304 boards that can follow this deal, 66 finishes with 81.01% of the pot and 54s with 18.99%. ## 66 against 54s: the numbers **Exact preflop results for 66 against 54s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 80.070 | 1.871 | 18.059 | 81.005 | | 54s | 18.059 | 1.871 | 80.070 | 18.995 | 66 and 54s are a pocket pair and a suited hand, in that order. Here a pair faces two cards that are both smaller, so the other hand needs to pair up and still be behind. 66 is a big favorite here before anyone sees a flop. Ties are 1.87% of the outcomes here; each tied board gives both hands half the pot. Place 17 of 169 belongs to 66 and place 136 belongs to 54s in the ranking against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 32,905,000 | 769,000 | 7,421,000 | | 54s | 7,421,000 | 769,000 | 32,905,000 | 24 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand. **66 against 54s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | 66 | 4.265 | 1.249 | 5.537 | 0.234 | | 54s | 0.234 | 5.537 | 1.249 | 4.265 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops 66 prefers rainbow flops topped by a ten or better, where it holds 84.60%, and likes monotone flops least, where it holds 75.26%. 66 stays ahead on all five textures. **66 against 54s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | 54s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.844 | 84.037 | 1.130 | 14.833 | 84.602 | | Rainbow, nine or lower | 5.065 | 75.698 | 0.719 | 23.583 | 76.058 | | Two-tone | 46.545 | 79.018 | 1.001 | 19.981 | 79.518 | | Monotone | 5.212 | 73.704 | 3.115 | 23.181 | 75.262 | | Paired | 17.334 | 80.173 | 5.271 | 14.556 | 82.808 | 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 63.29%, 66 changes by +17.72 points, and 54s, from 41.45%, by -22.46. **66 and 54s 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 | | --- | --- | --- | --- | --- | | 66, all flops | 81.005 | 63.285 | +17.720 | 1.28000 | | 66, rainbow, ten or higher | 84.602 | 63.285 | +21.317 | 1.33684 | | 66, rainbow, nine or lower | 76.058 | 63.285 | +12.773 | 1.20183 | | 66, two-tone | 79.518 | 63.285 | +16.233 | 1.25651 | | 66, monotone | 75.262 | 63.285 | +11.977 | 1.18925 | | 66, paired | 82.808 | 63.285 | +19.523 | 1.30849 | | 54s, all flops | 18.995 | 41.453 | -22.458 | 0.45823 | | 54s, rainbow, ten or higher | 15.398 | 41.453 | -26.055 | 0.37146 | | 54s, rainbow, nine or lower | 23.942 | 41.453 | -17.511 | 0.57757 | | 54s, two-tone | 20.482 | 41.453 | -20.971 | 0.49410 | | 54s, monotone | 24.738 | 41.453 | -16.715 | 0.59677 | | 54s, paired | 17.192 | 41.453 | -24.261 | 0.41473 | ## Does a shared suit matter? Split by suits, the deals give 66 81.56% when the hands overlap in a suit and 80.45% when they do not. 66 does better with a shared suit, by 1.11 points. **66 against 54s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | 54s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 80.605 | 1.910 | 17.485 | 81.560 | | No shared suit | 12 | 50.00 | 79.535 | 1.831 | 18.634 | 80.451 | ## How often this matchup comes up The class pair covers 24 combinations of specific cards in a fixed seat order, 0.0015% of 1,624,350, and 48 (0.0030%) in either order. ## A worked example Take a $200 pot built from $100 each. 66's equity of 81.01% is worth $162.02, a $62.02 edge, and 54s' 18.99% is worth $37.98, which is $62.02 under its stake. Think in thousands: about 801 of 1,000 go to 66, about 180 go to 54s, and about 19 are chopped. ## The same matchup from the other side The reversed view, 54s against 66, shows 18.99% for 54s and 81.01% for 66. It is the same count, so it redirects here. ## Keep exploring Try 6s6h against 5d4d 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 6s6h against 5d4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=5d4d) - [66 combos](https://georgelipoker.com/combos/66.md) - [54s combos](https://georgelipoker.com/combos/54s.md) - [66 vs 64s](https://georgelipoker.com/equity/66-vs-64s.md) - [66 vs 53s](https://georgelipoker.com/equity/66-vs-53s.md) - [A9s vs 54s](https://georgelipoker.com/equity/a9s-vs-54s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 24 deals of 66 against 54s fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [66 vs 64s: preflop equity](https://georgelipoker.com/equity/66-vs-64s.md) - [66 vs 53s: preflop equity](https://georgelipoker.com/equity/66-vs-53s.md) - [A9s vs 54s: preflop equity](https://georgelipoker.com/equity/a9s-vs-54s.md)