Hand odds / AJ vs 55

AJ vs 55: odds and equity

In short

55 wins 53.7% of the time against AJo all in before the flop, AJo wins 45.9%, and they split the pot 0.4% of the time. 55 is a small favourite. With AJs vs 55 the split is 48.7% to 51.3% in equity.

AJo

46.1%

vs

55

53.9%

Equity: win% plus half of the 0.4% split pots. 55 is a small favourite.

Every suit combination

MatchupHand 1 winsHand 2 winsSplitHand 1 equity
AJs vs 5548.4%51.1%0.5%48.7%
AJo vs 5545.9%53.7%0.4%46.1%

What the flop does to it

When no A or J comes on the flop (76.3% of flops), 55 has 64.9% equity going to the turn. When one does, 55 drops to 18.4%.

AJo has two overcards, so six cards in the deck pair it. That's why it's a race rather than a big favourite: plenty of flops give AJo a pair.

When this all-in happens in push/fold

At 10BB in 6-max, the Button shoves AJo always and the Big Blind calls with 55 always, so this exact all-in comes straight off the charts.

How often each hand shoves or calls in our solved 6-max chip-EV charts. A row with both columns high is a spot where this exact all-in is correct for both players. See every chart.

Common questions

Who is the favourite, AJ or 55?
55. All in preflop it has 53.9% equity against AJo: 53.7% wins plus half of the 0.4% split pots. That's a small favourite.
Do suits change the odds?
A little. AJs vs 55 is 48.7% to 51.3%; AJo vs 55 is 46.1% to 53.9%. Suited hands make more flushes, which is worth a few percent.
What happens on the flop?
When no A or J comes on the flop (76.3% of flops), 55 has 64.9% equity going to the turn. When one does, 55 drops to 18.4%.
When does AJ vs 55 happen in push/fold?
At 10BB in 6-max, the Button shoves AJo always and the Big Blind calls with 55 always, so this exact all-in comes straight off the charts.
How were these odds worked out?
By counting every possible five-card board for every combination of suits: 72 card combinations for AJo vs 55, 1,712,304 boards each. The numbers are exact, not simulated.

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