KJ vs K4s: Odds & Interactive Calculator
| Hand | Win | Tie | Equity |
|---|---|---|---|
| KJ (King-Jack) | 65.5% | 7.5% | 69.2% |
| K4s (King-Four Suited) | 27.0% | 7.5% | 30.8% |
Suited vs offsuit: KJ
| Matchup | Win | Tie | Equity |
|---|---|---|---|
| KJs | 66.6% | 7.3% | 70.2% |
| KJo | 65.1% | 7.6% | 68.9% |
How KJ vs K4s unfolds by street
King-Jack (KJ) is still ahead on 82% of flops against K4s, and the lead survives to the turn on 78%. K4s takes the lead on the other 18% of flops. These figures come from full board enumeration, not a simulation.
| Street | KJ still ahead | K4s flipped the lead |
|---|---|---|
| Flop | 82% | 18% |
| Turn | 78% | 22% |
Share a card and you get a kicker problem — that's KJ vs K4s: KJ wins 65.5%, K4s wins 27.0%, and 7.5% of boards chop. With the shared rank gutting its outs, K4s is a 2.4-to-1 underdog, and 7.5% of runouts split outright when both play the common card.
Here's the intuition behind 69.2% to 30.8%: KJ wins roughly 2 of every 3 times the chips go in, but the underdog cashing 30.8% of the time is exactly why you can't slow-play and let it draw for free.
Domination is where preflop hand-reading pays off. With KJ you want stacks in; with K4s you want out, because three outs and a prayer is not a stack-off — recognizing that you're crushed against a strong range is worth more than any postflop move.
KJ vs K4s FAQ
Who wins KJ vs K4s preflop?
KJ (King-Jack) is the favorite, winning 65.5% of all runouts, while K4s (King-Four Suited) wins 27.0%. The remaining 7.5% are split pots. Counting splits as half, KJ's preflop equity is 69.2%.
Does the KJ vs K4s 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: KJ's equity runs from 68.5% to 70.2% 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 (KJ leads on 82% of flops) and in multiway pots, where every extra caller takes equity from both hands.
Why is K4s so bad against KJ?
Because they share a card, K4s is drawing to roughly three outs and chops 7.5% of the time — it wins only about 1 in 4. That's the danger of a dominated hand: too strong to fold, too far behind to outdraw, which is how kicker problems quietly cost full stacks.
Does KJ hold up against K4s after the flop?
KJ is still ahead on 82% of flops and stays ahead through the turn on 78% of boards; K4s takes the lead on the other 18% of flops. These are exact figures from full board enumeration.
Run any matchup in the free equity calculator · AK VS A2S · AK VS A3S · AK VS A4S · AK VS A5S · AK VS A6S · AK VS A7S
See also: hand-vs-range preflop equity — your hand against a real opening, 3-bet, or shove range.