JJ vs AJ: Preflop Equity & Odds
| Hand | Win | Tie | Equity |
|---|---|---|---|
| JJ (Pocket Jacks) | 67.6% | 1.7% | 68.5% |
| AJ (Ace-Jack) | 30.7% | 1.7% | 31.5% |
Suited vs offsuit: AJ
| Matchup | Win | Tie | Equity |
|---|---|---|---|
| AJs | 33.7% | 1.7% | 34.5% |
| AJo | 29.7% | 1.7% | 30.6% |
How JJ vs AJ unfolds by street
Pocket Jacks (JJ) is still ahead on 82% of flops against AJ, and the lead survives to the turn on 76%. AJ takes the lead on the other 18% of flops, almost always by flopping a set. These figures come from full board enumeration, not a simulation.
| Street | JJ still ahead | AJ flipped the lead |
|---|---|---|
| Flop | 82% | 18% |
| Turn | 76% | 24% |
JJ vs AJ mixes a pair with an overlapping overcard, so an out on each side is already in someone's hand. JJ wins 67.6%, AJ wins 30.7%, and 1.7% of boards chop. That blocking effect is why JJ is a firmer 2.2-to-1 favorite than a straight pair-vs-two-overcards race.
Translate that into a decision and it's simple pot-odds math: counting split pots as half, JJ carries 68.5% equity and AJ 31.5%. Against a pot-sized shove you need about 33% to call and about 25% versus a half-pot bet — so AJ needs real fold equity, not just its raw share, to justify stacking off.
How you play JJ vs AJ depends on which side you hold. With JJ you're not crushing, so keep the pot controllable and take the 67.6% edge to showdown when you can; with AJ, your equity is enough to continue with initiative but thin enough that bloating the pot out of position is a trap.
JJ vs AJ FAQ
Who wins JJ vs AJ preflop?
JJ (Pocket Jacks) is the favorite, winning 67.6% of all runouts, while AJ (Ace-Jack) wins 30.7%. The remaining 1.7% are split pots. Counting splits as half, JJ's preflop equity is 68.5%.
How often does AJ beat JJ?
AJ wins 30.7% of the time all-in preflop against JJ — a genuine underdog, but with enough live outs (about 1 in 3) that the matchup is closer than the favorite would like.
Is JJ vs AJ a good spot to get all-in?
For JJ, yes — a 68.5% favorite should happily commit, especially with fold equity. For AJ at 31.5%, it depends on the price: enough to continue with initiative, but thin enough that stacking off out of position is usually a leak.
Does JJ hold up against AJ after the flop?
JJ is still ahead on 82% of flops and stays ahead through the turn on 76% of boards; AJ takes the lead on the other 18% of flops. These are exact figures from full board enumeration.
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