KK vs JJ: Preflop Equity & Odds
| Hand | Win | Tie | Equity |
|---|---|---|---|
| KK (Pocket Kings) | 81.3% | 0.4% | 81.5% |
| JJ (Pocket Jacks) | 18.3% | 0.4% | 18.5% |
When Pocket Kings (KK) runs into Pocket Jacks (JJ) before the flop, the bigger pair is a heavy favorite: KK wins 81.3% of the time, JJ wins 18.3%, and 0.4% of runouts end in a chopped pot. That makes KK roughly a 4.4-to-1 favorite. The smaller pair is drawing almost exclusively to one of the two remaining Jacks in the deck — about a 1-in-5 shot by the river — plus rare straight or flush escapes.
In equity terms — your long-run share of the pot counting split pots as half — KK holds 81.5% and JJ holds 18.5%. To make these numbers practical: facing a pot-sized all-in you need about 33% equity to call profitably, and a half-pot bet needs about 25%. Numbers on this page are exact, computed by full board enumeration (not simulation). Try any other hand or full ranges in the free equity calculator.
KK vs JJ FAQ
Who wins KK vs JJ preflop?
KK (Pocket Kings) is the favorite: it wins 81.3% of all runouts, while JJ (Pocket Jacks) wins 18.3%. 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 18.3% 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.
Are these KK vs JJ numbers exact?
Yes. They are computed by exhaustively enumerating every possible five-card board (1,712,304 boards per card combination) and averaging across all suit combinations of both hands — not by Monte Carlo simulation. Display values are rounded to one decimal place.
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