KK vs JJ: Preflop Equity & Odds
| Hand | Win | Tie | Equity |
|---|---|---|---|
| KK (Pocket Kings) | 81.3% | 0.4% | 81.5% |
| JJ (Pocket Jacks) | 18.2% | 0.4% | 18.5% |
How KK vs JJ unfolds by street
Pocket Kings (KK) is still ahead on 89% of flops against JJ, and the lead survives to the turn on 86%. JJ takes the lead on the other 11% of flops, almost always by flopping a set. These figures come from full board enumeration, not a simulation.
| Street | KK still ahead | JJ flipped the lead |
|---|---|---|
| Flop | 89% | 11% |
| Turn | 86% | 14% |
Set one pocket pair against a bigger one and you get KK vs JJ: KK wins 81.3%, JJ wins 18.2%, and 0.4% of boards chop. KK is a 4.5-to-1 favorite. JJ has only two clean outs — the case cards of its own rank — so it must flop or turn a set, or back into a straight or flush, to claim the 18.2% of pots it wins.
At a final table the raw 81.5% / 18.5% split is only half the story — ICM bends it. As the 18.5% underdog, JJ pays an extra survival premium, so the chip-EV "close enough" call can be a clear ICM fold. The pure equity sets the floor; the payout ladder sets the real price.
As the bigger pair, KK, your whole job is to get the money in before a scare card — there's no fold here and slow-playing only lets JJ realize its set equity for free. As the smaller pair, the discipline is recognizing when stacks are deep enough that calling off 18.2% equity is a leak, even though folding pre feels impossible.
KK vs JJ FAQ
Who wins KK vs JJ preflop?
KK (Pocket Kings) is the favorite, winning 81.3% of all runouts, while JJ (Pocket Jacks) wins 18.2%. The remaining 0.4% are split pots. Counting splits as half, KK's preflop equity is 81.5%.
How often does JJ beat KK?
JJ wins 18.2% of the time all-in preflop against KK — roughly 1 in 5 — so it needs good pot odds or fold equity to get the money in profitably.
Can you fold the smaller pair in KK vs JJ?
Almost never preflop all-in — but the 18.2% the smaller pair wins (about 1 in 5) means that when stacks are very deep and the action screams a bigger pair, laying it down is a real, if rare, fold. Set-mining the lower pair works only with the implied odds to win a full stack when you spike.
Does KK hold up against JJ after the flop?
KK is still ahead on 89% of flops and stays ahead through the turn on 86% of boards; JJ takes the lead on the other 11% of flops. These are exact figures from full board enumeration.
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