Bust meaning, in blackjack: your hand goes bust when its total goes over 21, and a bust hand loses straight away, even if the dealer later busts too. That single rule is where most of the house edge in blackjack comes from. Casino players also use 'bust' for running out of a session budget, and for a gambling business that becomes insolvent.
In blackjack you bust when your total passes 21; the hand loses immediately.
Players act first, so a player bust loses even if the dealer busts later: that ordering gives the house its edge.
Hitting a hard 16 busts about 62% of the time; the dealer busts most often when showing a 4, 5 or 6.
'Going bust' also describes losing your whole bankroll, or a casino becoming insolvent.
Blackjack meaning
Hand total over 21; automatic loss
Dealer bust
All remaining player hands win
Highest player risk
Hitting hard 12 to 16
Dealer most likely to bust
Showing 4, 5 or 6
Other meanings
Losing your bankroll; an insolvent operator
Bust meaning in blackjack rules
In blackjack, cards 2 to 10 count at face value, picture cards count 10 and an ace counts 1 or 11. If you take a card that pushes your total above 21, you have bust. The dealer collects your stake at once and you take no further part in that hand.
A hand containing an ace counted as 11, called a soft hand, can't bust on the next card, because the ace drops to 1 if needed. A hard hand has no such cushion, which is why hard 12 to 16 are the hands players worry about.
Why busting first gives the house its edge
Players act before the dealer. If you bust, you lose, and it doesn't matter that the dealer might bust a moment later. That's the one situation where both sides 'fail' but only the player pays, and it is the main source of the house edge. Blackjack paying 3 to 2, doubling and splitting give some of that back, which is why a player using basic strategy faces an edge of roughly half a percent on common rules.
Chance of busting when you hit
The figures below assume a large number of decks, close to the multi-deck shoes used online. They show the chance that one more card takes a hard total over 21.
Chance of busting with one more card on a hard total (approximate, multi-deck)
Hard total
Cards that bust you
Chance of busting
11 or less
None
0%
12
Any 10-value card
about 31%
13
9 or 10-value
about 38%
14
8, 9 or 10-value
about 46%
15
7 to 10-value
about 54%
16
6 to 10-value
about 62%
17
5 to 10-value
about 69%
These odds explain the basic strategy advice to stand on 12 to 16 when the dealer shows a weak card, and hit when the dealer shows 7 or higher: busting yourself is bad, but standing on 16 against a strong dealer card loses more often.
Dealer bust odds by upcard
The dealer has no choices: the rules force them to hit until 17 or more. That makes their bust chance depend mainly on the visible card. Figures vary a little with the number of decks and whether the dealer stands on soft 17.
Approximate chance the dealer busts, by upcard (dealer stands on soft 17)
Dealer upcard
Chance dealer busts
2
about 35%
3
about 37%
4
about 40%
5
about 42%
6
about 42%
7
about 26%
8
about 24%
9
about 23%
10 or picture
about 21%
Ace
roughly 12–17%, depending on rules
Even at its weakest, with a 5 or 6 showing, the dealer makes a hand more often than not. 'The dealer will bust' is never a safe assumption. The Wizard of Odds blackjack guide (opens in a new tab) publishes detailed dealer probability tables for different rule sets.
Worked example: a bust hand in pounds
You stake £10 and are dealt 10 and 6: hard 16. The dealer shows a 9.
Basic strategy says hit, because standing on 16 against a 9 loses more often.
You draw an 8: total 24. You've bust and lose £10 straight away.
The dealer turns over a 7 for 16, hits and draws a 10: dealer busts on 26.
Other players still in the hand win, but your £10 is already gone.
That sequence feels unlucky, yet it is exactly how the game is built. Over many hands, following strategy still loses less than guessing.
Other meanings of bust in casinos
Going bust on your bankroll
Players say they've 'gone bust' when they've lost the whole amount set aside for a session. With a sensible bankroll plan, going bust should mean stopping, not depositing again. If you often top up after going bust, that's a sign worth taking seriously; the signs of problem gambling guide and GamCare (opens in a new tab) can help.
Bust works the same way at every UK-licensed casino, but the surrounding rules have changed. Since 17 January 2025, RNG table games must allow at least 5 seconds per game cycle and can't offer autoplay, so each hand is dealt and decided individually; see table game speed rules. Live dealer tables run at the dealer's pace. You must be 18 or over and age-verified even to play demo versions, a rule in place since May 2019; our demo play guide explains it.
Related blackjack terms
Natural: an ace and a ten-value card as your first two cards.
Push: a tie with the dealer, with your stake returned.
Double down: one more card for double the stake, which can't bust from 11 or less.
Surrender: giving up half the stake instead of risking a likely loss.
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Frequently asked questions
What does bust mean in blackjack?
It means your hand's total has gone over 21. A bust hand loses immediately and your stake is collected, regardless of what happens to the dealer's hand afterwards. Picture cards count 10 and aces count 1 or 11, so a hand with an ace counted as 11 drops to the lower value rather than busting. The dealer can bust too, in which case all player hands still in play win. Our blackjack rules page covers card values and play order in full.
If I bust and the dealer busts, who wins?
The dealer wins your bet. Because players act first, your hand is settled as a loss the moment you bust, before the dealer plays. The dealer then busting only helps players who are still in the hand. This asymmetry is the main reason blackjack has a house edge at all, even though both sides follow similar card rules. The house edge on blackjack answer and our house edge guide explain how the other rules offset it.
What total are you most likely to bust on?
The higher your hard total, the more likely one more card busts you: about 31% on hard 12, rising to about 62% on hard 16 and 69% on hard 17, using multi-deck odds. That's why basic strategy almost never hits hard 17 or more. With 11 or less, or with a soft hand, one card can't bust you. The right decision also depends on the dealer's upcard, as our blackjack basic strategy page explains, and the hard hand definition covers stiff totals.
Which dealer card is most likely to bust?
A 5 or 6 showing gives the highest dealer bust rate, at about 42%, with 4 close behind at about 40%. A 7 or higher drops the chance to around a quarter or less, and an ace is lowest. Even so, the dealer still completes a hand most of the time against a weak card, so a weak dealer card doesn't make standing on a poor total safe. Our online blackjack guide and best odds casino games page put these figures in context.
Can you bust in other casino games?
Yes, in a few. Some blackjack variants and card games use bust-based side bets that pay when the dealer busts, often with bigger payouts for busting with more cards; these side bets carry a higher house edge than the main game. Baccarat and roulette have no bust concept. Outside game rules, 'bust' also describes losing your whole bankroll or a business becoming insolvent. Our blackjack side bets and side bet definition explain how those wagers pay.
What happens to my money if an online casino goes bust?
It depends on the level of customer funds protection the operator declares. With high protection, money is held in a separate account controlled by an independent trustee; with medium protection, safeguards such as insurance apply; unprotected funds count as company assets in insolvency. Casinos must tell you the level before you deposit. Check it in the terms or the deposit page. Our player funds protection page and the answer on what happens to my balance if a casino closes cover the detail.
What should I do when I go bust on my budget?
Stop for the session. The budget was the amount you decided you could afford to spend on entertainment, and topping it up after losing it is a common route into chasing losses. Deposit limits, loss limits and time-outs let you make that decision stick in advance. If stopping feels hard, talk to the National Gambling Helpline on 0808 8020 133. Our guides to gambling budgets and taking a break explain the tools.
Gambling can be addictive. Free, confidential help is available 24 hours a day from the National Gambling Helpline on 0808 8020 133. Get free support from GamCare or NHS gambling support, or block yourself from all UK-licensed gambling sites with GAMSTOP.
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