55 vs AK Odds: Pocket Fives vs Ace King

55 Wins

52.5%

AK Wins

47.1%

Tie

0.4%

Facing a standard open raise (2.5–3x) — call and set mine

With 20+ big blinds behind after the call, 55 has enough implied odds to set mine profitably. Call, see a flop, and fold cleanly when no 5 appears. This is the highest-EV line in most cash game contexts.

Facing a shove (all-in) — assess the full range

Against AK specifically, calling a shove with 55 is marginally +EV at 52.5%. Against a realistic shoving range that includes overpairs, it may be –EV. Make this decision based on opponent tendencies, not just the AK-specific equity number.

In a 3-bet or squeeze situation — lean toward fold

When 55 faces significant preflop action — a raise plus a 3-bet — the pot is too large relative to implied odds for set mining, and the raw equity (52.5% vs AK) does not justify calling off a large fraction of your stack.

What are the exact preflop odds of 55 vs AK?

Pocket fives (55) wins 52.5% of the time against Ace King offsuit (AKo) with all five community cards dealt. AK wins 47.1%, and ties occur 0.4% of the time. The tie rate is slightly higher than for larger pairs because lower-card boards produce more shared straights — for example, both players can use a board of A-2-3-4-5 as the best five-card hand. 55 wins because it enters with a made pair of fives, while AK has only ace-king high. AK's six outs to top pair (3 aces and 3 kings) and its two backdoor straight connections keep it competitive, but the unimproved pair wins the majority of runouts.

Is 55 vs AKs actually a coin flip?

Yes, essentially. When AK is suited, the matchup narrows to 50.7% for 55 vs 49.0% for AKs — a difference of only 1.7 percentage points. This is as close to a true coin flip as you will find in poker between two meaningfully different hand types. The suited AK gains roughly 1.8% equity over AKo by adding a flush draw possibility: boards that run out three or more of AK's suit give AKs a flush draw that occasionally completes. That marginal equity boost is enough to push the matchup nearly to 50:50. For all practical purposes at a poker table, 55 vs AKs should be mentally coded as a coin flip — the small mathematical edge for 55 is irrelevant in the noise of a single hand.

Should I call an all-in shove with 55?

Against AK specifically, calling with 55 is a break-even play at 52.5% — you are a tiny favourite. In a vacuum, this is a profitable call, but the decision is almost never made in a vacuum. Real shoving ranges include overpairs (66-AA) where 55 is crushed at 80:20, as well as AK, AQ, and sometimes AJ. Before calling, assess the villain's range: if they only shove premium hands, 55 becomes a significant underdog because you are flipping against AK only ~25-30% of the time and being crushed by overpairs the rest. Against a wide shoving range that includes many weak aces and suited connectors, calling with 55 becomes very profitable. Stack depth matters too — with deep stacks and position, set mining is often better than committing preflop.

What is the set mining calculation for 55?

55 flops a set 11.8% of the time, meaning roughly 1 in every 8.5 flops produces a 5. When you do flop a set, you are approximately a 94.6% favourite against AK. The set mining calculation asks: is the 11.8% chance of flopping a set, multiplied by the expected pot size when you win, greater than the cost of calling preflop? A standard rule of thumb: you need approximately 10-15x the preflop call in effective stacks to make set mining with a small pair profitable. For example, if you call a $20 raise to set mine, you need roughly $200-$300 in effective stacks to justify the call. This is because you will miss the set 88.2% of the time and often have to fold on the flop, so the wins need to be large enough to compensate.

How does 55 handle low boards like 2-3-4 or A-2-3?

Low boards are double-edged for 55. A board of 2-3-4 is dangerous because AK holds an open-ended straight draw — specifically to a 5 completing A-2-3-4-5 or to a 6 completing 2-3-4-5-6. If the 5 comes on the turn, AK makes the wheel straight (A-2-3-4-5) and actually beats 55's trips. An A-2-3 board is similarly awkward — AK has top pair plus a wheel draw to the 4 and 5. These board textures illustrate why low pairs like 55 are more vulnerable than higher pairs: the relevant straight draws tend to involve cards near 55's rank, creating scenarios where AK gains equity from straight completions that would not threaten 88 or 99. Players holding 55 need to be cautious on any board with three low connected cards.

How does stack depth change the 55 vs AK strategy?

Stack depth fundamentally changes whether the correct play with 55 is to set mine or commit preflop. At 10-15 big blinds (short stack), you have no choice — there is no implied odds play available when you commit a large fraction of your stack preflop. At these depths, calling or shoving with 55 is a pure equity decision, and 52.5% vs AK is barely profitable. At 25-40 big blinds, you can sometimes see a flop but are not deep enough for full set mining value. At 50+ big blinds, set mining becomes the primary strategy: call a standard raise, see a cheap flop, and fold when you miss. The deeper the effective stacks, the more valuable the 11.8% set-flop probability becomes because you will win a correspondingly larger pot.

How does 55 vs AK compare to the rest of the small pair spectrum?

55 sits near the bottom of the coin flip zone for pairs vs AK. The full comparison: QQ wins 56.7%, JJ wins 54.8%, TT wins 55.2%, 99 wins 53.4%, 88 wins 53.9%, 77 wins 53.1%, 66 wins 52.8%, 55 wins 52.5%, 44 wins 52.2%, 33 wins 51.9%, 22 wins 51.7%. 55 at 52.5% is close to the bottom of the pack, and when facing suited AK, it drops to 50.7% — effectively the true floor of coin flip territory. The differences between 55, 44, and 33 are negligible in practice. What distinguishes 55 from 44 and 33 in terms of playability is not the raw equity but the set value: a set of fives can still make the best hand on most boards, while smaller sets face more straight and flush board threats.