JJ vs A4s: Odds & Interactive Calculator
| Hand | Win | Tie | Equity |
|---|---|---|---|
| JJ (Pocket Jacks) | 66.8% | 0.4% | 67.1% |
| A4s (Ace-Four Suited) | 32.7% | 0.4% | 32.9% |
How JJ vs A4s unfolds by street
Pocket Jacks (JJ) is still ahead on 80% of flops against A4s, and the lead survives to the turn on 75%. A4s takes the lead on the other 20% of flops. These figures come from full board enumeration, not a simulation.
| Street | JJ still ahead | A4s flipped the lead |
|---|---|---|
| Flop | 80% | 20% |
| Turn | 75% | 25% |
JJ vs A4s is a lopsided race — only one of A4s's cards is an overcard to the pair. JJ wins 66.8%, A4s wins 32.7%, and 0.4% of boards chop. With roughly half the outs of a true two-overcard flip, A4s is a clear 2.0-to-1 dog that usually needs to pair its live card (or find a sneaky straight/two-pair runout) to win.
Think in variance terms: 67.1% equity means JJ loses this all-in nearly 33 times in 100, so even a "dominant" spot is a coin you'll see come up tails plenty. Getting it in as the 67.1% favorite is correct every time; the 32.9% that goes the other way is math, not a misplay.
In practice, JJ vs A4s rewards aggression from the favorite and caution from the dog: JJ wants to realize its 66.8% edge by getting value and denying free cards, while A4s should lean on fold equity and position rather than hoping to win the pot at showdown about 1 time in 3.
Where to take JJ vs A4s next
Getting it in near the money bubble or at a final table? Chip equity isn't prize equity — check the spot in the ICM calculator before you call off your stack.
Played a hand like this yourself? Import it into the poker hand analyzer for a street-by-street review of every decision, not just the all-in.
For the bigger picture, the poker tournament strategy guide covers when to shove and when to fold as stacks shrink, and what GTO poker is explains why strong players think in ranges rather than single hands.
New to the game? The poker hand rankings chart shows which hand wins at showdown, how to play poker: a beginner's guide walks through the rules and betting rounds, and the poker strategy guide shows where preflop equity fits into a winning game plan.
JJ vs A4s FAQ
Who wins JJ vs A4s preflop?
JJ (Pocket Jacks) is the favorite, winning 66.8% of all runouts, while A4s (Ace-Four Suited) wins 32.7%. The remaining 0.4% are split pots. Counting splits as half, JJ's preflop equity is 67.1%.
Does the JJ vs A4s 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 66.8% to 67.3% depending on how many 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 80% of flops) and in multiway pots, where every extra caller takes equity from both hands.
Is JJ vs A4s a good spot to get all-in?
For JJ, yes — a 67.1% favorite should happily commit, especially with fold equity. For A4s at 32.9%, 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 A4s after the flop?
JJ is still ahead on 80% of flops and stays ahead through the turn on 75% of boards; A4s takes the lead on the other 20% of flops. These are exact figures from full board enumeration.
Run any matchup in the free equity calculator · KK VS AQ · KK VS AJ · QQ VS AJ · QQ VS KJ · KK VS AT · QQ VS AT
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)