A9s vs 55: preflop equity

A9s against 55: the numbers

A9s, a suited hand, plays 55, a pocket pair. A pair against two higher cards is the classic race: the pair is usually a small favorite or close to even, and each overcard that pairs is a way to take the lead.

With only 5.00 points between them, the board decides this matchup far more than the cards in hand. A split pot comes up on 0.48% of boards, so the wins and the equity differ by half of that.

For context, A9s sits at number 18 of 169 starting hands and 55 at number 27 when each is run against a random hand.

Exact total: 24 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate.

The final column gives the least the pot must offer for each unit called for a call to break even at this equity.

Who is ahead on which flops

Across the five flop textures 55's equity moves by 10.06 points, from 51.09% on two-tone flops to 61.15% on low rainbow flops (nine high or lower). 55 stays ahead on all five textures.

Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank.

Compared with a random hand

Compared with a random opponent, this matchup shifts A9s from 62.78% by -15.28 points and 55 from 60.33% by -7.83 points.

Does a shared suit matter?

The suit split reads 52.69% for 55 with a shared suit and 52.31% without one. 55 does better with a shared suit, by 0.38 points.

How often this matchup comes up

Counting specific cards, A9s against 55 appears in 24 of the 1,624,350 ordered heads-up deals (0.0015%), and in 48 when the seats are swapped too (0.0030%).

A worked example

Worked example: both players commit $100, so $200 sits in the middle. Over every board, 55's average share is $105.00 (a gain of $5.00) and A9s' is $95.00 (a loss of $5.00).

Per 1,000 deals: 55 wins about 523, A9s wins about 472, and about 5 end in a split pot.

The same matchup from the other side

Swap the hands and you get 55 with 52.50% against A9s with 47.50%. We keep one page per matchup, with the better-ranked hand first.

Keep exploring

Try As9s against 5h5d in the calculator: the hands share no suit, and every card can be changed. The links after it are the closest matchups in the ranking.

• Open As9s against 5h5d in the equity calculator
• A9s combos
• 55 combos
• A9s vs QJs
• A9s vs K9s
• ATo vs 55
• All hand matchups