--- title: "KJs vs A3s: preflop equity" url: "https://georgelipoker.com/equity/kjs-vs-a3s.md" canonical_url: "https://georgelipoker.com/equity/kjs-vs-a3s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, KJs or A3s? A3s leads 57.00% to 43.00% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kjs-vs-qjo.md", "https://georgelipoker.com/equity/kjs-vs-k9o.md", "https://georgelipoker.com/equity/a8s-vs-a3s.md"] --- # KJs vs A3s: preflop equity Who is ahead, KJs or A3s? A3s leads 57.00% to 43.00% before the flop, counted exactly over every board, with the split by flop type and suit. The exact count puts A3s at 57.00% and KJs at 43.00% when the two hands see all five board cards. ## KJs against A3s: the numbers **Exact preflop results for KJs against A3s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KJs | 42.725 | 0.544 | 56.731 | 42.997 | | A3s | 56.731 | 0.544 | 42.725 | 57.003 | Here suited hands face each other, KJs on one side and A3s on the other. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. That is a modest edge, the kind that shows up over many hands and is easy to miss in one. A split pot comes up on 0.54% of boards, so the wins and the equity differ by half of that. Ranked by equity against a random hand, KJs is number 20 of the 169 starting hands and A3s is number 38. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KJs | 11,705,000 | 149,000 | 15,543,000 | | A3s | 15,543,000 | 149,000 | 11,705,000 | Exact total: 16 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **KJs against A3s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | KJs | 0.754 | 2.341 | 1.763 | 1.326 | | A3s | 1.326 | 1.763 | 2.341 | 0.754 | The final column gives the least the pot must offer for each unit called for a call to break even at this equity. ## Who is ahead on which flops A3s prefers low rainbow flops (nine high or lower), where it holds 74.91%, and likes rainbow flops topped by a ten or better least, where it holds 50.80%. A3s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KJs against A3s by flop texture, in percent** | Flop | Share of flops | KJs wins | Ties | A3s wins | KJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 49.141 | 0.124 | 50.735 | 49.203 | | Rainbow, nine or lower | 7.042 | 24.526 | 1.122 | 74.352 | 25.087 | | Two-tone | 46.727 | 44.036 | 0.310 | 55.654 | 44.191 | | Monotone | 5.273 | 43.824 | 3.447 | 52.729 | 45.548 | | Paired | 17.091 | 37.339 | 0.637 | 62.024 | 37.658 | 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 A random hand would give KJs 62.57% and A3s 58.22%. Against each other the change is -19.57 points for KJs and -1.22 for A3s. **KJs and A3s 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 | | --- | --- | --- | --- | --- | | KJs, all flops | 42.997 | 62.567 | -19.570 | 0.68722 | | KJs, rainbow, ten or higher | 49.203 | 62.567 | -13.364 | 0.78640 | | KJs, rainbow, nine or lower | 25.087 | 62.567 | -37.480 | 0.40096 | | KJs, two-tone | 44.191 | 62.567 | -18.376 | 0.70630 | | KJs, monotone | 45.548 | 62.567 | -17.019 | 0.72799 | | KJs, paired | 37.658 | 62.567 | -24.909 | 0.60188 | | A3s, all flops | 57.003 | 58.220 | -1.217 | 0.97910 | | A3s, rainbow, ten or higher | 50.797 | 58.220 | -7.423 | 0.87250 | | A3s, rainbow, nine or lower | 74.913 | 58.220 | +16.693 | 1.28672 | | A3s, two-tone | 55.809 | 58.220 | -2.411 | 0.95859 | | A3s, monotone | 54.452 | 58.220 | -3.768 | 0.93528 | | A3s, paired | 62.342 | 58.220 | +4.122 | 1.07080 | ## Does a shared suit matter? Does suit overlap move the numbers? A3s has 58.90% when the hands share a suit and 56.37% when they do not. A3s does better with a shared suit, by 2.53 points. **KJs against A3s by suit overlap, in percent** | Deals | Specific deals | Share of deals | KJs wins | Ties | A3s wins | KJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 40.789 | 0.626 | 58.585 | 41.102 | | No shared suit | 12 | 75.00 | 43.370 | 0.516 | 56.114 | 43.628 | ## How often this matchup comes up Exactly 16 specific deals fit this matchup in one seat order, which is 0.0010% of 1,624,350; both orders together give 32, or 0.0020%. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says A3s gets $114.00 of it on average and KJs gets $86.00. Think in thousands: about 567 of 1,000 go to A3s, about 427 go to KJs, and about 6 are chopped. ## The same matchup from the other side A3s against KJs adds nothing new: it is 57.00% for A3s and 43.00% for KJs, the same figures reversed. ## Keep exploring Try KsJs against Ah3h 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 KsJs against Ah3h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsJs&p2=Ah3h) - [KJs combos](https://georgelipoker.com/combos/kjs.md) - [A3s combos](https://georgelipoker.com/combos/a3s.md) - [KJs vs QJo](https://georgelipoker.com/equity/kjs-vs-qjo.md) - [KJs vs K9o](https://georgelipoker.com/equity/kjs-vs-k9o.md) - [A8s vs A3s](https://georgelipoker.com/equity/a8s-vs-a3s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 16 ways to deal one KJs and one A3s 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 - [KJs vs QJo: preflop equity](https://georgelipoker.com/equity/kjs-vs-qjo.md) - [KJs vs K9o: preflop equity](https://georgelipoker.com/equity/kjs-vs-k9o.md) - [A8s vs A3s: preflop equity](https://georgelipoker.com/equity/a8s-vs-a3s.md)