--- title: "JJ vs A4s: preflop equity" url: "https://georgelipoker.com/equity/jj-vs-a4s.md" canonical_url: "https://georgelipoker.com/equity/jj-vs-a4s" last_updated: "2026-10-23" type: "reference" summary: "JJ is a big favorite over A4s before the flop: 67.05% to 32.95% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/jj-vs-a3s.md", "https://georgelipoker.com/equity/jj-vs-qjo.md", "https://georgelipoker.com/equity/tt-vs-a4s.md"] --- # JJ vs A4s: preflop equity JJ is a big favorite over A4s before the flop: 67.05% to 32.95% equity, counted exactly over every board, with the split by flop type and suit. In equity, JJ against A4s stands at 67.05% to 32.95%, a gap of 34.10 points. ## JJ against A4s: the numbers **Exact preflop results for JJ against A4s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | JJ | 66.840 | 0.422 | 32.738 | 67.051 | | A4s | 32.738 | 0.422 | 66.840 | 32.949 | Here a pocket pair (JJ) meets a suited hand (A4s). 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, 67.05% to 32.95%, but A4s still wins often enough that one hand proves nothing. A split pot comes up on 0.42% of boards, so the wins and the equity differ by half of that. Among the 169 starting hands, JJ is number 4 and A4s is number 35 by strength against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | JJ | 27,468,000 | 173,000 | 13,454,000 | | A4s | 13,454,000 | 173,000 | 27,468,000 | The total is exact: 24 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **JJ against A4s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | JJ | 2.035 | 1.496 | 3.055 | 0.491 | | A4s | 0.491 | 3.055 | 1.496 | 2.035 | 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 Low rainbow flops (nine high or lower) are the best for JJ (72.74%); monotone flops are the worst (62.80%). JJ stays ahead on all five textures. **JJ against A4s by flop texture, in percent** | Flop | Share of flops | JJ wins | Ties | A4s wins | JJ equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 67.112 | 0.149 | 32.739 | 67.187 | | Rainbow, nine or lower | 7.042 | 72.194 | 1.089 | 26.717 | 72.738 | | Two-tone | 46.545 | 65.102 | 0.336 | 34.562 | 65.270 | | Monotone | 5.212 | 61.593 | 2.422 | 35.985 | 62.804 | | Paired | 17.334 | 70.534 | 0.156 | 29.310 | 70.612 | 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, JJ holds 77.47% and A4s holds 59.03%. Facing each other changes that by -10.42 points for JJ and -26.08 points for A4s. **JJ and A4s 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 | | --- | --- | --- | --- | --- | | JJ, all flops | 67.051 | 77.469 | -10.418 | 0.86552 | | JJ, rainbow, ten or higher | 67.187 | 77.469 | -10.282 | 0.86728 | | JJ, rainbow, nine or lower | 72.738 | 77.469 | -4.731 | 0.93893 | | JJ, two-tone | 65.270 | 77.469 | -12.199 | 0.84253 | | JJ, monotone | 62.804 | 77.469 | -14.665 | 0.81070 | | JJ, paired | 70.612 | 77.469 | -6.857 | 0.91149 | | A4s, all flops | 32.949 | 59.034 | -26.085 | 0.55814 | | A4s, rainbow, ten or higher | 32.813 | 59.034 | -26.221 | 0.55583 | | A4s, rainbow, nine or lower | 27.262 | 59.034 | -31.772 | 0.46180 | | A4s, two-tone | 34.730 | 59.034 | -24.304 | 0.58831 | | A4s, monotone | 37.196 | 59.034 | -21.838 | 0.63008 | | A4s, paired | 29.388 | 59.034 | -29.646 | 0.49781 | ## Does a shared suit matter? Suit overlap shows up in the numbers. With a suit in common JJ has 67.34% equity, and with none in common it has 66.76%. JJ does better with a shared suit, by 0.58 points. **JJ against A4s by suit overlap, in percent** | Deals | Specific deals | Share of deals | JJ wins | Ties | A4s wins | JJ equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 67.106 | 0.465 | 32.429 | 67.338 | | No shared suit | 12 | 50.00 | 66.574 | 0.379 | 33.047 | 66.764 | ## How often this matchup comes up Exactly 24 specific deals fit this matchup in one seat order, which is 0.0015% of 1,624,350; both orders together give 48, or 0.0030%. ## A worked example With $100 from each side, the $200 pot is split on average as $134.10 for JJ and $65.90 for A4s; the first side gains $34.10 per all-in and the second gives up $34.10. Run 1,000 deals and the tally comes out near 669 for JJ, 327 for A4s and 4 ties. ## The same matchup from the other side Swap the hands and you get A4s with 32.95% against JJ with 67.05%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring Try JsJh against Ad4d 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 JsJh against Ad4d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=JsJh&p2=Ad4d) - [JJ combos](https://georgelipoker.com/combos/jj.md) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [JJ vs A3s](https://georgelipoker.com/equity/jj-vs-a3s.md) - [JJ vs QJo](https://georgelipoker.com/equity/jj-vs-qjo.md) - [TT vs A4s](https://georgelipoker.com/equity/tt-vs-a4s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 24 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [JJ vs A3s: preflop equity](https://georgelipoker.com/equity/jj-vs-a3s.md) - [JJ vs QJo: preflop equity](https://georgelipoker.com/equity/jj-vs-qjo.md) - [TT vs A4s: preflop equity](https://georgelipoker.com/equity/tt-vs-a4s.md)