The Quick Answer
A straight flush beats four of a kind every single time.
In standard poker rules, hand rankings follow a strict hierarchy based on mathematical rarity. Four of a kind (often called quads) sits directly below a straight flush on the official hierarchy. Because of this position, no four of a kind ever beats any straight flush, regardless of the card ranks involved.
Even four Aces, the strongest possible four of a kind, will lose to the lowest possible straight flush, such as five-high in hearts (5♥-4♥-3♥-2♥-A♥). If you find yourself in a rare showdown where both hands are tabled, the straight flush takes the pot.
Understanding the Two Hands
First, a quick definition of each hand.
Four of a kind consists of all four cards of the same numerical rank plus one side card known as a kicker. The kicker is an extra card used to break ties if two players share the same four of a kind, which can happen in community card games. For example, four nines with a King kicker is a complete five-card hand.
A straight flush consists of five cards in numerical sequence, all belonging to the same suit. A straight flush that runs from Ten to Ace in the same suit is known as a royal flush. A royal flush is simply an Ace-high straight flush, and it represents the highest hand in the game.
To understand other fundamental rank comparisons, see our guide on flush vs straight.
Why the Straight Flush Wins: The Math
Poker uses a fixed hand-ranking order set by the rules; the combination counts below show how rare these hands are.
In a standard 52-card deck, there are exactly 2,598,960 possible unique five-card hands.
Four of a kind has 624 total combinations. This number comes from 13 possible ranks multiplied by 48 possible kickers (or 156 rank choices times 4 kicker suits). That means four of a kind occurs in about 0.0240% of all five-card hands, or roughly 1 in 4,165 deals. For additional perspective on monster hands, read our breakdown of full house vs flush. A full house has 3,744 combinations, making quads about 6 times rarer than a full house (3,744 / 624 = 6).
A straight flush has only 40 combinations in total across all four suits. These 40 hands include the 4 royal flushes. That translates to an occurrence rate of 0.001539%, or approximately 1 in 649,740 deals. If you exclude the royal flushes, there are only 36 straight flushes, which appear about 1 in 72,193 deals.
Because 624 divided by 40 equals 15.6, a straight flush is roughly 15.6 times rarer than four of a kind. The official poker hand rankings chart reflects that gap, with the straight flush sitting directly above quads.
Math Comparison Table
The table below breaks down the exact mathematical combinations and odds for each hand using a standard 52-card deck:
| Hand Rank | Exact Combinations | Probability (%) | Approximate Odds | Rarity Comparison |
|---|---|---|---|---|
| Straight Flush (inc. Royal) | 40 | 0.001539% | 1 in 649,740 | 15.6 times rarer than Quads |
| Straight Flush (exc. Royal) | 36 | 0.001385% | 1 in 72,193 | 17.3 times rarer than Quads |
| Four of a Kind | 624 | 0.0240% | 1 in 4,165 | 6 times rarer than Full House |
| Full House (for context) | 3,744 | 0.1441% | 1 in 694 | Baseline reference |
A Showdown Example
Collisions between four of a kind and a straight flush do happen. Here is an example with no duplicate cards:
- Community Board: 9♣ 9♥ Q♥ T♥ J♥
- Player 1 holds: 9♠ 9♦
- Player 2 holds: 8♥ 7♥
Player 1 combines their pocket pair with the community cards to form four of a kind: 9♠ 9♦ 9♣ 9♥ with a Queen kicker (Q♥). This hand beats almost everything in poker.
Player 2 combines their suited connectors with the board to form a Jack-high straight flush: 7♥ 8♥ 9♥ T♥ J♥.
Even though Player 1 holds four nines, Player 2 wins the pot. The Jack-high straight flush outranks the four of a kind.
When Does Four of a Kind Win?
Holding four of a kind is still one of the strongest spots you can find in card games. Four of a kind wins against every category of hand below it:
- Full house
- Flush
- Straight
- Three of a kind (trips)
- Two pair
- One pair
- High card
Four of a kind also wins in quads-versus-quads situations if your rank is higher. For example, four 9s beats four 7s by rank.
The only thing in poker above a straight flush is a higher straight flush. Because the royal flush is simply an Ace-high straight flush, four of a kind can never surpass any straight flush in the game.
FAQ
Can four Aces ever beat a 5-high straight flush?
No. In standard hand rankings, hand categories always beat lower categories regardless of individual card ranks. Any straight flush beats any four of a kind.
How much rarer is a straight flush than four of a kind?
A straight flush is roughly 15.6 times rarer than four of a kind. There are 40 straight flush combinations (including royals) compared to 624 combinations of quads.
What beats a straight flush?
The only hand that beats a straight flush is a higher-ranking straight flush. A royal flush is the highest possible straight flush.
Does the kicker matter if two players make four of a kind?
Yes. If two players share the same four of a kind from a community board, the player with the higher fifth card (the kicker) wins the pot.