--- title: "A4s vs JTo: preflop equity" url: "https://georgelipoker.com/equity/a4s-vs-jto.md" canonical_url: "https://georgelipoker.com/equity/a4s-vs-jto" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A4s or JTo? A4s leads 57.12% to 42.88% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a4s-vs-t9s.md", "https://georgelipoker.com/equity/a4s-vs-33.md", "https://georgelipoker.com/equity/a3s-vs-jto.md"] --- # A4s vs JTo: preflop equity Who is ahead, A4s or JTo? A4s leads 57.12% to 42.88% before the flop, counted exactly over every board, with the split by flop type and suit. Over all 1,712,304 boards that can follow this deal, A4s finishes with 57.12% of the pot and JTo with 42.88%. ## A4s against JTo: the numbers **Exact preflop results for A4s against JTo, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A4s | 56.886 | 0.462 | 42.652 | 57.117 | | JTo | 42.652 | 0.462 | 56.886 | 42.883 | A4s and JTo are a suited hand and an offsuit hand, in that order. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances. The lead is steady rather than large, and the flop still has plenty of say in who wins. Of every 100 boards, about 0.46 are split pots, and the equity figures already include them. The hand ranking puts A4s at 35 and JTo at 57 out of 169 starting hands. **Boards behind the percentages: 82,190,592 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A4s | 46,755,000 | 380,000 | 35,056,000 | | JTo | 35,056,000 | 380,000 | 46,755,000 | 48 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. **A4s against JTo 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 | 1.332 | 1.758 | 2.345 | 0.751 | | JTo | 0.751 | 2.345 | 1.758 | 1.332 | 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 Split by what the flop looks like, A4s peaks at 70.60% on low rainbow flops (nine high or lower) and bottoms out at 50.18% on rainbow flops topped by a ten or better. A4s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **A4s against JTo by flop texture, in percent** | Flop | Share of flops | A4s wins | Ties | JTo wins | A4s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.988 | 50.101 | 0.165 | 49.734 | 50.183 | | Rainbow, nine or lower | 7.042 | 70.205 | 0.787 | 29.008 | 70.598 | | Two-tone | 46.667 | 56.527 | 0.284 | 43.189 | 56.669 | | Monotone | 5.212 | 53.257 | 2.385 | 44.358 | 54.450 | | Paired | 17.091 | 63.011 | 0.645 | 36.344 | 63.333 | Rainbow flops have three suits, two-tone flops repeat one suit, monotone flops are all one suit, and paired flops repeat a rank. ## Compared with a random hand The table below sets each hand against its own random-hand baseline: a change of -1.91 points for A4s, from 59.03%, and -12.37 for JTo, from 55.25%. **A4s and JTo 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 | 57.117 | 59.034 | -1.917 | 0.96753 | | A4s, rainbow, ten or higher | 50.183 | 59.034 | -8.851 | 0.85007 | | A4s, rainbow, nine or lower | 70.598 | 59.034 | +11.564 | 1.19589 | | A4s, two-tone | 56.669 | 59.034 | -2.365 | 0.95994 | | A4s, monotone | 54.450 | 59.034 | -4.584 | 0.92235 | | A4s, paired | 63.333 | 59.034 | +4.299 | 1.07282 | | JTo, all flops | 42.883 | 55.248 | -12.365 | 0.77619 | | JTo, rainbow, ten or higher | 49.817 | 55.248 | -5.431 | 0.90170 | | JTo, rainbow, nine or lower | 29.402 | 55.248 | -25.846 | 0.53218 | | JTo, two-tone | 43.331 | 55.248 | -11.917 | 0.78430 | | JTo, monotone | 45.550 | 55.248 | -9.698 | 0.82446 | | JTo, paired | 36.667 | 55.248 | -18.581 | 0.66368 | ## Does a shared suit matter? Two kinds of deal exist here. In 24 of them the hands share a suit and A4s holds 56.76%. In 24 they do not, and it holds 57.48%. A4s does better with no shared suit, by 0.72 points. **A4s against JTo by suit overlap, in percent** | Deals | Specific deals | Share of deals | A4s wins | Ties | JTo wins | A4s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 24 | 50.00 | 56.505 | 0.505 | 42.990 | 56.758 | | No shared suit | 24 | 50.00 | 57.267 | 0.420 | 42.313 | 57.477 | ## How often this matchup comes up This page stands for 48 specific-card matchups (0.0030% of 1,624,350 ordered deals), or 96 once you count the seats both ways (0.0059%). ## A worked example Say each player puts $100 in before the flop, making a $200 pot. On average A4s takes back $114.24 of it, which is $14.24 more than it put in, and JTo takes back $85.76, $14.24 less than it put in. A thousand deals look like this: A4s takes 569, JTo takes 426, 5 are ties. ## The same matchup from the other side Read it from the other side: JTo against A4s is the same matchup with the numbers swapped, so JTo holds 42.88% and A4s holds 57.12%. That address sends you back to this page. ## Keep exploring Try As4s against JhTd 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 As4s against JhTd in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As4s&p2=JhTd) - [A4s combos](https://georgelipoker.com/combos/a4s.md) - [JTo combos](https://georgelipoker.com/combos/jto.md) - [A4s vs T9s](https://georgelipoker.com/equity/a4s-vs-t9s.md) - [A4s vs 33](https://georgelipoker.com/equity/a4s-vs-33.md) - [A3s vs JTo](https://georgelipoker.com/equity/a3s-vs-jto.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 48 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A4s vs T9s: preflop equity](https://georgelipoker.com/equity/a4s-vs-t9s.md) - [A4s vs 33: preflop equity](https://georgelipoker.com/equity/a4s-vs-33.md) - [A3s vs JTo: preflop equity](https://georgelipoker.com/equity/a3s-vs-jto.md)