Blackjack Dealer Bust Rates by Upcard
Last reviewed: June 2026
The dealer’s upcard is the single most important piece of information at the blackjack table — it determines whether the dealer is likely to bust, which in turn drives every hit, stand, double, and split decision in basic strategy.
When the dealer shows a low card (2 through 6), she must draw repeatedly, and the odds of busting climb to 35–42%. When she shows a 7 through Ace, she enters most drawing sequences from a stronger position, and her bust rate drops to roughly 15–25%. That gap — roughly 20 percentage points — is the entire engine behind why basic strategy looks the way it does.
Dealer Bust Rates by Upcard
The figures below reflect a standard multi-deck game with the dealer standing on soft 17 (S17 rules). Minor variation occurs with H17 rules but the relative ranking of upcards stays the same.
| Dealer upcard | Approximate bust rate | Classification |
|---|---|---|
| 2 | ~35% | Weak |
| 3 | ~37% | Weak |
| 4 | ~40% | Weak |
| 5 | ~42% | Weakest |
| 6 | ~42% | Weakest |
| 7 | ~26% | Moderate |
| 8 | ~24% | Moderate |
| 9 | ~23% | Strong |
| 10 / Face | ~23% | Strong |
| Ace | ~17% | Very strong |
A few things stand out. First, 5 and 6 are essentially tied as the dealer’s worst upcards — a 42% bust rate means nearly one in two hands ends without the dealer completing a valid total. Second, the 10-value upcard (10, Jack, Queen, King) and the 9 are nearly identical in bust risk. Third, the Ace is by far the dealer’s strongest position: she either has a natural (instant win unless you also have 21) or draws from a flexible 11, and she busts in only about 17% of hands.
Why Weak Upcards Call for Aggressive Play
When the dealer is likely to bust, you do not need a strong hand to win — you simply need to be standing when she does. This creates two strategic consequences.
Stand on more stiff totals. A stiff hand (hard 12–16) is dangerous to hit because the next card might bust you. Against a dealer showing 4, 5, or 6, you are favored to win by doing nothing, because the dealer will bust often enough to overcome your weak total. Basic strategy therefore tells you to stand on hard 12–16 against dealer 2–6 even though your hand looks terrible in isolation.
Double and split more aggressively. When the dealer is in trouble, putting more money on the table has positive expected value. Doubling down on soft hands (like soft 16 or soft 17) against a dealer 5 or 6 is profitable because you combine your own flexibility — you can’t bust on one more card from a soft total — with the dealer’s elevated bust probability. The same logic applies to splits: splitting 8s or 9s against a weak upcard extracts more value than playing a single stiff total.
Why Strong Upcards Call for Conservative Play
The 10-value upcard deserves special attention. A dealer showing 10 has roughly a one-in-three chance of having a natural (if the hole card is an Ace), and even when she doesn’t, she draws from a strong position. Her bust rate against your action is only about 23%.
Against a 10, you cannot afford to wait. Basic strategy tells you to hit stiff totals (hard 12–16) against a dealer 10, because the math favors drawing — even at the risk of busting yourself — over surrendering the hand by standing on a total the dealer will often beat. This surprises many players who think standing on 14 vs. 10 “plays it safe,” but giving up without drawing is simply accepting a higher expected loss.
Against an Ace, the situation is even more extreme. The dealer’s bust rate is roughly 17%, which means the vast majority of her hands result in a made total. Insurance is offered because of this risk, but at a house edge of roughly 5.88% it is never a mathematically sound bet unless you are counting cards. See blackjack insurance and side bets for the full breakdown.
Connecting Bust Rates to the Strategy Chart
If you have ever wondered why the basic strategy chart has that distinctive diagonal pattern — aggressive plays on the left columns (low dealer upcards), conservative plays on the right (high dealer upcards) — dealer bust probability is the explanation. Every cell in the chart is the mathematically optimal response given your hand’s distribution of outcomes and the dealer’s likelihood of completing or busting her hand.
The chart is not intuition or convention. It is the result of calculating expected value across every possible deck state. Understanding bust rates is the clearest way to see why the chart is correct rather than just memorizing what it says. For the full mathematical derivation, visit Blackjack Basic Strategy Math.
If you want to practice applying these decisions in real time, the blackjack trainer will flag every deviation from optimal play.
Frequently Asked
Should I stand on a stiff hand whenever the dealer might bust? Only when the dealer is showing a weak upcard (2–6). Against strong upcards (7 through Ace), hitting a stiff total is almost always correct despite the risk of busting, because the dealer’s low bust rate means standing leaves you losing too often.
Does the bust rate change as cards are removed from the shoe? Yes, slightly. A deck that has seen many low cards removed is relatively richer in 10-value cards, which pushes the dealer’s bust rate somewhat lower on weak upcards and modestly higher on strong ones. This is one reason card counters can adjust their play beyond basic strategy, but for most players the standard chart is close enough to optimal regardless of deck composition.
Why does the Ace have such a low bust rate compared to other strong upcards? Because the Ace can count as 1 or 11. The dealer effectively draws from a soft total, which means she can absorb a high card without busting by switching the Ace to 1. A dealer showing a 9 or 10 has no such flexibility.
Does any of this change the house edge? The bust-rate pattern is already baked into the published house edges. A player using full basic strategy on a standard 3:2 six-deck game faces roughly 0.5% house edge — that figure assumes optimal play in every upcard situation including correctly standing or hitting stiff totals. Deviating from the chart (e.g., always standing on stiff hands regardless of dealer upcard) increases the effective edge against you. The house edge by game article covers how rule variations shift that baseline.
Sources & Further Reading
- Wizard of Odds — Blackjack House Edge — dealer bust probabilities by upcard and rule set
- Wizard of Odds — Blackjack Basic Strategy — complete strategy charts under various rule conditions
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