JJ vs KJ: Preflop Equity & Odds
| Hand | Win | Tie | Equity |
|---|---|---|---|
| JJ (Pocket Jacks) | 66.5% | 1.6% | 67.3% |
| KJ (King-Jack) | 31.9% | 1.6% | 32.7% |
Suited vs offsuit: KJ
| Matchup | Win | Tie | Equity |
|---|---|---|---|
| KJs | 34.8% | 1.6% | 35.6% |
| KJo | 30.9% | 1.7% | 31.7% |
How JJ vs KJ unfolds by street
Pocket Jacks (JJ) is still ahead on 81% of flops against KJ, and the lead survives to the turn on 75%. KJ takes the lead on the other 19% of flops, almost always by flopping a set. These figures come from full board enumeration, not a simulation.
| Street | JJ still ahead | KJ flipped the lead |
|---|---|---|
| Flop | 81% | 19% |
| Turn | 75% | 25% |
JJ vs KJ mixes a pair with an overlapping overcard, so an out on each side is already in someone's hand. JJ wins 66.5%, KJ wins 31.9%, and 1.6% of boards chop. That blocking effect is why JJ is a firmer 2.1-to-1 favorite than a straight pair-vs-two-overcards race.
Here's the intuition behind 67.3% to 32.7%: JJ wins roughly 2 of every 3 times the chips go in, but the underdog cashing 32.7% of the time is exactly why you can't slow-play and let it draw for free.
How you play JJ vs KJ depends on which side you hold. With JJ you're not crushing, so keep the pot controllable and take the 66.5% edge to showdown when you can; with KJ, your equity is enough to continue with initiative but thin enough that bloating the pot out of position is a trap.
JJ vs KJ FAQ
Who wins JJ vs KJ preflop?
JJ (Pocket Jacks) is the favorite, winning 66.5% of all runouts, while KJ (King-Jack) wins 31.9%. The remaining 1.6% are split pots. Counting splits as half, JJ's preflop equity is 67.3%.
How often does KJ beat JJ?
KJ wins 31.9% 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 KJ a good spot to get all-in?
For JJ, yes — a 67.3% favorite should happily commit, especially with fold equity. For KJ at 32.7%, 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 KJ after the flop?
JJ is still ahead on 81% of flops and stays ahead through the turn on 75% of boards; KJ takes the lead on the other 19% of flops. These are exact figures from full board enumeration.
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