Double down in blackjack when your first two cards make a hard 11 (against any dealer card except an ace), a hard 10 (against a dealer 2 to 9) or a hard 9 (against a dealer 3 to 6). With soft hands, double A-2 and A-3 against a 5 or 6, A-4 and A-5 against a 4 to 6, and A-6 and A-7 against a 3 to 6. Never double a hard 12 or more.
Those are the doubling rules of basic strategy for the four to eight-deck shoe games used at most live dealer tables, as published by the Wizard of Odds, for a dealer who stands on soft 17. This guide gives the full doubling chart, the changes when the dealer hits soft 17, the probabilities behind each double, how table rules change the value of the move, and how doubling works at a live table. For the full game, start with our live blackjack guide.
Updated October 2026. We corrected several figures from the old version of this page: an 11 in an eight-deck shoe has 128 ten-value cards that make 21, not 32, and a hard 9 is a double only against a dealer 3 to 6, not against a 2.
What does double down mean?
Doubling down means doubling your original bet in exchange for exactly one more card. After that card, your hand stands automatically, whatever the total. If the hand wins, you are paid even money on the full doubled stake; if it loses, you lose the full doubled stake.
The phrase has passed into everyday English, where “doubling down” means committing harder to a decision. At the table it is narrower and more mechanical: you trade the right to keep hitting for a bigger bet on a hand where you are already the favourite.
That trade is the whole logic of the move. Doubling only makes sense when one card is likely to give you a strong total and the dealer’s up card is likely to finish weak. Get those two conditions right and doubling is one of the main tools that bring blackjack’s house edge down to around half a percent.
When can you double down?
You can double only as your first decision on a hand, after the first two cards are dealt and before you hit. Once you take a third card, the option is gone. Most tables let you double on any first two cards, but some restrict it, and the rules matter:
- Any two cards: the standard rule in most US casinos and online shoe games.
- 9, 10 or 11 only: a common restriction, especially in European-style games.
- 10 or 11 only: a tighter restriction that removes the soft doubles and the hard 9 double.
- After a split: allowed at many tables (double after split, or DAS), but not all. Split aces almost never allow a double.
The help screen at a live table or the placard on a land-based table tells you which version you are playing.
The doubling chart (4 to 8 decks, dealer stands on soft 17)
D means double (if doubling is not allowed, hit), Ds means double if allowed, otherwise stand, and a dash means do not double: play the hand with the normal hit or stand chart.
| Your hand | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | A |
|---|---|---|---|---|---|---|---|---|---|---|
| Hard 8 or less | – | – | – | – | – | – | – | – | – | – |
| Hard 9 | – | D | D | D | D | – | – | – | – | – |
| Hard 10 | D | D | D | D | D | D | D | D | – | – |
| Hard 11 | D | D | D | D | D | D | D | D | D | – |
| Soft 13 and 14 (A-2, A-3) | – | – | – | D | D | – | – | – | – | – |
| Soft 15 and 16 (A-4, A-5) | – | – | D | D | D | – | – | – | – | – |
| Soft 17 (A-6) | – | D | D | D | D | – | – | – | – | – |
| Soft 18 (A-7) | – | Ds | Ds | Ds | Ds | – | – | – | – | – |
| Soft 19 or more, hard 12 or more | – | – | – | – | – | – | – | – | – | – |
Source: Wizard of Odds basic strategy for four to eight decks, dealer stands on soft 17. A pair of 5s is played as a hard 10 (double against 2 to 9), never split. A pair of aces is always split, not doubled. Where the chart says not to double a soft 18, stand against a 2, 7 or 8 and hit against a 9, 10 or ace, as our hit or stand guide explains.
Changes when the dealer hits soft 17
At a table where the dealer must hit soft 17 (H17), the Wizard of Odds lists three extra doubles for four to eight decks:
- Hard 11 against a dealer ace becomes a double.
- Soft 18 (A-7) is doubled against a 2 as well.
- A-8, a soft 19, is doubled against a 6.
The H17 rule is bad for you overall, adding about 0.22% to the house edge per the Wizard of Odds, but it makes the dealer’s weak up cards slightly weaker, so a few borderline doubles become worth it. The rule is printed on the felt or in the game’s help screen.
Single-deck and double-deck games
With fewer decks, the cards you hold change the odds more, and basic strategy doubles a little more often. One example: in one and two-deck games the chart also doubles hard 9 against a dealer 2 and hard 11 against an ace. These games are rare online; live blackjack is almost always dealt from six or eight decks.
Why these hands are doubles: the numbers
Four of the thirteen card ranks (10, jack, queen, king) are worth 10. In a large shoe, about 30.8% of cards are ten-value, which is why 10 and 11 are the best doubling hands. The table below shows where one card takes each hand, using our own infinite-deck calculation (each rank has a 1-in-13 chance):
| Starting hand | Chance of 21 | Chance of 20 | Chance of 18 to 21 | Chance of 17 or less |
|---|---|---|---|---|
| Hard 11 | 30.8% (any ten-value) | 7.7% (a 9) | 53.8% | 46.2% |
| Hard 10 | 7.7% (an ace) | 30.8% (any ten-value) | 53.8% | 46.2% |
| Hard 9 | 0% | 7.7% (an ace) | 46.2% | 53.8% |
None of these hands can bust with one card. The question is whether the finished total beats the dealer often enough to justify twice the money. That depends on the up card. In an eight-deck game where the dealer stands on soft 17, the Wizard of Odds puts the dealer’s bust rate at 41.79% with a 5 showing and 42.29% with a 6, against 23.01% with a 10 and 16.69% with an ace (after the dealer has checked for blackjack).
Put the two sets of numbers together and the chart makes sense. Against a 5 or 6, even a weak finishing total wins whenever the dealer busts, so you can double hands as thin as 9 or A-2. Against a 10, the dealer usually makes 17 to 21, so only an 11, with its 30.8% chance of drawing 21, is strong enough to double.
A note on the old “32 cards” claim
The previous version of this page said that an eight-deck shoe holds “up to 32 cards” that turn an 11 into 21. That counts only the tens. An eight-deck shoe has 416 cards, and 128 of them are ten-value (32 each of tens, jacks, queens and kings), so 128 cards make 21. Add the 96 sevens, eights and nines and 224 of 416 cards, about 54%, take an 11 to 18 or more.
Hand by hand: when to double down
Hard 11: double against everything except an ace
Eleven is the best doubling hand in the game. Any ten-value card makes 21, and a 7, 8 or 9 still gives you 18 to 20. Even against a dealer 10, doubling 11 wins more over time than hitting. Against an ace in a stand-on-soft-17 shoe game, just hit; if the dealer hits soft 17, double that too.
Hard 10: double against 2 to 9
Ten is almost as strong as 11, but it needs an ace to make 21 instead of any ten-value card. That is enough to make it a hit, not a double, against a dealer 10 or ace.
Hard 9: double against 3 to 6
Nine is the weakest hard double. It only finishes on 18 or more about 46% of the time, so it pays to double only when the dealer is likely to bust. Against a 2, hit in shoe games. Against 7 or higher, hit.
Soft 13 to 16: double against the weakest up cards
A-2 through A-5 cannot bust with one card, and a 5 or 6 showing gives the dealer a bust rate above 41%. That combination makes a small double profitable even though your own finishing total is often modest. The chart doubles A-2 and A-3 against a 5 or 6, and A-4 and A-5 against a 4, 5 or 6.
Soft 17 and soft 18: double against 3 to 6
Soft 17 (A-6) is a weak total that should never stand, so doubling it against a dealer 3 to 6 is an easy call. Soft 18 (A-7) is a good total, which is why the chart says double against 3 to 6 only if allowed and otherwise stand. Players often stand on A-7 against a 6 out of caution; doubling earns more.
Hard 12 or more: never double
Doubling a hard 12 to 16 means accepting exactly one card that busts you often: about 31% of the time on 12 and about 62% on 16. Basic strategy never doubles a hard 12 or higher. The old advice that you should “never double down if your total is greater than 11” is right for hard totals, but soft 17 and soft 18 are exceptions.
How table rules change the value of doubling
Doubling is worth a lot. Measured against an eight-deck baseline where the dealer stands on soft 17, you may double on any first two cards, double after splitting, and split to four hands, the Wizard of Odds gives these effects:
| Rule | Effect for the player |
|---|---|
| Player may not double at all | -1.48% |
| Player may not double or split | -1.91% |
| Double on 10 and 11 only | -0.18% |
| No doubling after a split | -0.14% |
| Double on 9 to 11 only | -0.09% |
| Double on any number of cards | +0.23% |
| Double Down Rescue (surrender after doubling) | +0.10% |
Source: Wizard of Odds blackjack rule variations. The same figures, shown as house-edge changes, appear in our blackjack hub. A table that bans doubling altogether costs you about 1.48 points, roughly three times the house edge of a good table. A 6:5 blackjack payout costs about 1.39 points, so a 3:2 table with a doubling restriction is still a better game than a 6:5 table with full doubling.
Doubling for less
Many land-based casinos let you double for less than your original bet. Basic strategy assumes a full double. When the chart says double, the extra money is a favourable bet, so cutting it short gives away part of the gain. If you cannot afford the full double, the better fix is a smaller base bet.
No hole card games
In European no hole card blackjack, the dealer takes the second card after the players act, so a doubled bet can lose to a dealer blackjack. The Wizard of Odds puts the cost of losing doubles this way at about 0.08 points, and the strategy changes accordingly: hit 11 against a dealer 10 instead of doubling. If the table pays back extra money from doubles and splits when the dealer has blackjack (original bets only, or OBO), use the normal chart. New Jersey’s blackjack rules require that protection in the state’s default dealing procedure (N.J.A.C. 13:69F-2.10(b)). Our guide to hole card vs no hole card blackjack has the full list of changes.
Doubling after a split
When you split a pair, each new hand is played on its own, and if the table allows double after split (DAS) you can double one or both. Doubling both split hands puts four times your original bet on the table, so keep enough balance for it. Split aces are the usual exception: most tables deal one card to each ace and allow no further action.
DAS is worth about 0.14% to you, according to the Wizard of Odds, and it changes the splitting chart: with DAS you split 2s, 3s and 6s against more dealer cards, and 4s against a 5 or 6, because a split card that draws to 10 or 11 can then be doubled. See when to split in blackjack for the pair chart.
A worked example: $25 on 11 against a dealer 6
Say you bet $25 and receive 6-5 for a hard 11 while the dealer shows a 6. Doubling adds another $25, so $50 is now at risk on a single card.
- A ten-value card (about 31%) gives you 21, which the dealer can at best tie.
- Roughly 23% of the time a 7, 8 or 9 lands for 18 to 20, totals that beat most dealer finishes from a 6.
- The remaining 46% or so is an ace or a 2 to 6, leaving you on 12 to 17. Even then you win whenever the dealer busts, about 42% of the time from a 6.
Win, and you collect $50 profit instead of $25. Lose, and you lose $50. Over many hands the double earns more than hitting the same 11 for $25, which is why the chart says double. Any single hand can still lose.
How to signal a double down
At a live dealer table online, you press the Double button during the decision timer. The software moves the extra stake from your balance and deals one card. If the balance is too low for the full double, the button is usually unavailable.
In a land-based casino, place a stack of chips equal to your original bet next to it, not on top, and point with one finger to show you want one card. Do not touch your original bet. In hand-held single and double-deck games, you place your cards face up on the felt first. Saying “double” out loud helps, but the chips are what the camera and the pit boss watch.
Doubling down at live dealer tables
Classic live blackjack, the seven-seat format most lobbies carry, uses eight decks with the dealer standing on all 17s. Our hub describes Evolution’s standard tables as allowing a double on any first two cards and one split, with one card on split aces. Some third-party rule summaries for the same games list doubling on 9, 10 or 11 only, or no doubling after a split, because casinos can configure tables differently. Check the help screen before you sit down, since it decides which doubles in the chart are available.
Some live formats change doubling outright. Free Bet Blackjack gives you free doubles on two-card hard totals of 9, 10 and 11, paid for by a dealer-22-pushes rule; Power Blackjack lets you double, triple or quadruple on any two initial cards, even after a split. Shared-hand games such as Infinite Blackjack have their own rules. Our blackjack variations guide compares them.
The live-table timer also matters. If you hesitate, many studios apply a default action for you, which is never a double, so decide early on an 11 against a 6.
Common doubling mistakes
- Not doubling 11 against a 10. It feels risky; in a hole card shoe game it is still the better play.
- Doubling 9 against a 2 or 7. In shoe games, hit instead.
- Standing on soft 17 or soft 18 against a 3 to 6. Double them.
- Doubling a hard 12. One card busts you on any ten-value card.
- Doubling for less. If the chart says double, double the full amount.
- Raising bets to chase losses. No betting system changes the house edge; our progressive betting guide shows why a Martingale only puts more money at risk.
Where doubling fits with the other decisions
Basic strategy checks decisions in a fixed order: surrender first where it is offered, then split, then double, then hit or stand. The other steps have their own guides: when to surrender, when to split and when to hit. For the house edge, bust rates and starting-hand odds behind all of them, see blackjack odds and probability.
In the US, eight states have legalised online casinos and seven markets are live (New Jersey, Pennsylvania, Michigan, West Virginia, Connecticut, Delaware and Rhode Island). Maine’s tribal-only market under LD 1164 became law without the governor’s signature in January 2026 and took effect on 29 July 2026, but it had not launched as of October 2026. Correct doubling lowers the house edge but does not remove it, so set a budget and use the tools in our responsible gambling guide. The National Problem Gambling Helpline, 1-800-MY-RESET (1-800-697-3738), is free and confidential.
Frequently asked questions
When should you double down in blackjack?
In a four to eight-deck game where the dealer stands on soft 17, double hard 11 against 2 to 10, hard 10 against 2 to 9 and hard 9 against 3 to 6. Double A-2 and A-3 against 5 or 6, A-4 and A-5 against 4 to 6, and A-6 and A-7 against 3 to 6.
Should you double down on 11 against a dealer ace?
Only if the dealer hits soft 17. In a shoe game where the dealer stands on soft 17, the Wizard of Odds basic strategy says hit 11 against an ace; when the dealer hits soft 17, double it.
Should you double down on 11 against a 10?
Yes, in a hole card game where the dealer has already checked for blackjack. In a European no hole card game where doubled bets are lost to a dealer blackjack, hit instead.
Can you double down after hitting?
No. At standard tables you can double only on your first two cards, or on the first two cards of a split hand where doubling after a split is allowed. A few variants, such as Super Fun 21, allow doubling on any number of cards.
Can you double down on soft hands?
Yes, and basic strategy does. Soft 13 to 18 are all doubles against some weak dealer cards, because a soft hand cannot bust with one card. Soft 17 and soft 18 are doubled against a 3 to 6.
Should you ever double down on 12?
No. Basic strategy never doubles a hard 12 or more, because one card busts you about 31% of the time on 12 and more often on higher totals, with twice the money at risk.
Sources
- Wizard of Odds: Basic strategy for 4 to 8 decks (doubling rules and H17 changes)
- Wizard of Odds: Blackjack rule variations (doubling restrictions, DAS, double any number of cards)
- Wizard of Odds: Dealer odds under US rules (appendix 2a, after peek)
- Wizard of Odds: European (no hole card) basic strategy
- New Jersey DGE: N.J.A.C. 13:69F blackjack rules (2.10(b) original wager only)
- Evolution: Live Blackjack
- SBC Americas: Maine legalises online casinos (January 2026)
- NCPG homepage (1-800-MY-RESET)
Spotted an error? Email [email protected] with the page address. Verified corrections are made with a dated note.