--- title: "A9o vs JTo: preflop equity" url: "https://georgelipoker.com/equity/a9o-vs-jto.md" canonical_url: "https://georgelipoker.com/equity/a9o-vs-jto" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A9o or JTo? A9o leads 55.91% to 44.09% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9o-vs-t9s.md", "https://georgelipoker.com/equity/a9o-vs-33.md", "https://georgelipoker.com/equity/kjo-vs-jto.md"] --- # A9o vs JTo: preflop equity Who is ahead, A9o or JTo? A9o leads 55.91% to 44.09% before the flop, counted exactly over every board, with the split by flop type and suit. The exact count puts A9o at 55.91% and JTo at 44.09% when the two hands see all five board cards. ## A9o against JTo: the numbers **Exact preflop results for A9o against JTo, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9o | 55.702 | 0.413 | 43.885 | 55.908 | | JTo | 43.885 | 0.413 | 55.702 | 44.092 | Two offsuit hands meet here: A9o against JTo. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. A9o is ahead, but JTo is far from dead: it takes 439 of every 1,000 deals outright. A split pot comes up on 0.41% of boards, so the wins and the equity differ by half of that. Ranked by equity against a random hand, A9o is number 25 of the 169 starting hands and JTo is number 57. **Boards behind the percentages: 246,571,776 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A9o | 137,345,000 | 1,018,000 | 108,208,000 | | JTo | 108,208,000 | 1,018,000 | 137,345,000 | 144 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. **A9o 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) | | --- | --- | --- | --- | --- | | A9o | 1.268 | 1.795 | 2.279 | 0.789 | | JTo | 0.789 | 2.279 | 1.795 | 1.268 | 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 Across the five flop textures A9o's equity moves by 20.66 points, from 49.97% on rainbow flops topped by a ten or better to 70.63% on low rainbow flops (nine high or lower). The lead reverses on rainbow flops topped by a ten or better: there JTo is the favorite even though A9o is ahead overall. **A9o against JTo by flop texture, in percent** | Flop | Share of flops | A9o wins | Ties | JTo wins | A9o equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.110 | 49.887 | 0.157 | 49.956 | 49.965 | | Rainbow, nine or lower | 7.042 | 70.260 | 0.746 | 28.994 | 70.633 | | Two-tone | 46.606 | 54.400 | 0.278 | 45.322 | 54.539 | | Monotone | 5.151 | 52.758 | 1.674 | 45.568 | 53.595 | | Paired | 17.091 | 62.342 | 0.624 | 37.034 | 62.654 | Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank. ## Compared with a random hand Compared with a random opponent, this matchup shifts A9o from 60.77% by -4.86 points and JTo from 55.25% by -11.16 points. **A9o 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 | | --- | --- | --- | --- | --- | | A9o, all flops | 55.908 | 60.773 | -4.865 | 0.91995 | | A9o, rainbow, ten or higher | 49.965 | 60.773 | -10.808 | 0.82216 | | A9o, rainbow, nine or lower | 70.633 | 60.773 | +9.860 | 1.16224 | | A9o, two-tone | 54.539 | 60.773 | -6.234 | 0.89742 | | A9o, monotone | 53.595 | 60.773 | -7.178 | 0.88189 | | A9o, paired | 62.654 | 60.773 | +1.881 | 1.03095 | | JTo, all flops | 44.092 | 55.248 | -11.156 | 0.79807 | | JTo, rainbow, ten or higher | 50.035 | 55.248 | -5.213 | 0.90564 | | JTo, rainbow, nine or lower | 29.367 | 55.248 | -25.881 | 0.53155 | | JTo, two-tone | 45.461 | 55.248 | -9.787 | 0.82285 | | JTo, monotone | 46.405 | 55.248 | -8.843 | 0.83994 | | JTo, paired | 37.346 | 55.248 | -17.902 | 0.67597 | ## Does a shared suit matter? When the hands share a suit, A9o holds 55.91%; when they do not, it holds 55.89%. The two rows differ by only 0.02 points, so suits barely change this matchup. **A9o against JTo by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9o wins | Ties | JTo wins | A9o equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 120 | 83.33 | 55.698 | 0.428 | 43.874 | 55.912 | | No shared suit | 24 | 16.67 | 55.722 | 0.334 | 43.944 | 55.889 | ## How often this matchup comes up You will meet this exact matchup 0.0177% of the time in a random heads-up deal: 288 of 1,624,350, counting either seat order. ## A worked example Put $100 each into a $200 pot and deal every board once: A9o averages $111.82 back, ahead of its $100 by $11.82, while JTo averages $88.18, short of its $100 by $11.82. Run 1,000 deals and the tally comes out near 557 for A9o, 439 for JTo and 4 ties. ## The same matchup from the other side The reversed view, JTo against A9o, shows 44.09% for JTo and 55.91% for A9o. It is the same count, so it redirects here. ## Keep exploring As9h against JdTc 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 As9h against JdTc in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9h&p2=JdTc) - [A9o combos](https://georgelipoker.com/combos/a9o.md) - [JTo combos](https://georgelipoker.com/combos/jto.md) - [A9o vs T9s](https://georgelipoker.com/equity/a9o-vs-t9s.md) - [A9o vs 33](https://georgelipoker.com/equity/a9o-vs-33.md) - [KJo vs JTo](https://georgelipoker.com/equity/kjo-vs-jto.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 144 ways to deal one A9o and one JTo without reusing a card, grouped by suit pattern, every one of the 1,712,304 possible boards is dealt and both seven-card hands are compared. A tie counts as half a win in the equity column, and each board is counted once under each of its ten three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A9o vs T9s: preflop equity](https://georgelipoker.com/equity/a9o-vs-t9s.md) - [A9o vs 33: preflop equity](https://georgelipoker.com/equity/a9o-vs-33.md) - [KJo vs JTo: preflop equity](https://georgelipoker.com/equity/kjo-vs-jto.md)