JJ vs KJ: Odds & Interactive Calculator
| 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%.
Does the JJ vs KJ probability change all-in preflop?
No. Once both hands are all-in preflop the odds are set by the cards alone — position, stack size and who bet first change nothing. The only thing that moves the number is suits: JJ's equity runs from 64.4% to 68.4% depending on suitedness and which suits the two hands share, which is why different sites quote slightly different figures. It does change once board cards are dealt (JJ leads on 81% of flops) and in multiway pots, where every extra caller takes equity from both hands.
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.
Run any matchup in the free equity calculator · AA VS AQ · AA VS AJ · KK VS KQ · KK VS KJ · QQ VS AQ · QQ VS KQ
JJ against a range
All-in against one known hand is the textbook case; at the table JJ is usually up against a range. Exact equities, computed over every combo with card removal applied:
- JJ vs calling station — 71.9% against 670 combos (50.5% of hands)
- JJ vs BTN open — 70.9% against 586 combos (44.2% of hands)
- JJ vs SB open — 70.0% against 534 combos (40.3% of hands)
- JJ vs CO open — 68.5% against 366 combos (27.6% of hands)