Single deck blackjack is dealt from one 52-card pack, and on the same rules it gives the player about 0.48% more than an eight-deck game. That head start is easily lost: a 6 to 5 blackjack payout costs 1.39% on its own, so the rules attached to a one-deck table matter far more than the deck count.
One deck is worth about +0.48% to the player against eight decks, all other rules equal.
Paying blackjack at 6 to 5 instead of 3 to 2 costs 1.39%, more than the deck saves.
A single-deck game at 0.05% rises to 1.44% when blackjack pays 6 to 5.
Online RNG games reshuffle every round, which removes any counting value and trims the edge slightly.
Check the payout, the soft 17 rule and doubling limits before you rate a one-deck game.
Cards
One 52-card deck
Value against eight decks
About +0.48% to the player
Chance of a two-card blackjack
About 4.83% (one deck)
Cost of a 6 to 5 payout
−1.39%
Example online edge
0.31% (Microgaming Vegas single deck, dealer hits soft 17)
Insurance edge, one deck
About 5.88%
Why single deck blackjack has better odds
Blackjack can be dealt from anything between one and eight standard decks. With fewer cards in play, each card dealt changes the make-up of what's left by a larger amount, and on balance those shifts favour the player. You see it in the payouts that matter most: naturals and doubles.
Take the chance of a natural from a fresh pack. With one deck it's 2 × 4/52 × 16/51, about 4.83%. With eight decks it's 2 × 32/416 × 128/415, about 4.75%. The gap looks tiny, but a natural pays 3 to 2, and small differences in frequent hands add up across thousands of rounds. Our guide to how many decks are used goes further into the reasons.
A rule-variation table from Wizard of Odds puts a number on the whole effect. Measured against an eight-deck game with otherwise identical rules, fewer decks are worth this much to the player:
Value of fewer decks, against an eight-deck baseline
Decks
Effect on the player
On £10 a hand
Per 100 hands at £10
1
+0.48%
about 4.8p
about £4.80
2
+0.19%
about 1.9p
about £1.90
4
+0.06%
about 0.6p
about 60p
5
+0.03%
about 0.3p
about 30p
6
+0.02%
about 0.2p
about 20p
8
Baseline
–
–
Most of the benefit arrives in the jump from two decks to one. Between four, six and eight decks the difference is a few pence per hundred hands.
The single deck blackjack catch: rules that cancel the deck
Because one deck is valuable to players, single-deck tables often come with rules that take the value back. The usual suspects, again measured against Wizard of Odds' eight-deck baseline, are:
Rules often paired with single deck games
Rule
Effect on the player
On £10 a hand
Blackjack pays 6 to 5
−1.39%
about 13.9p worse
Blackjack pays even money
−2.27%
about 22.7p worse
Dealer hits soft 17
−0.22%
about 2.2p worse
Doubling on 10 and 11 only
−0.18%
about 1.8p worse
No doubling after a split
−0.14%
about 1.4p worse
No re-splitting
−0.10%
about 1p worse
Worked example: one deck at 6 to 5
Start from the eight-deck baseline. Moving to one deck adds 0.48% for the player; paying 6 to 5 removes 1.39%. Using Wizard of Odds' figures as additive approximations on the same baseline, the net change is about −0.91%, so the one-deck table is now worse than an ordinary eight-deck game paying 3 to 2. A direct example comes from the same source: a single-deck game with a 0.05% house edge rises to 1.44% when blackjack pays 6 to 5.
In pounds, at £10 a hand that's the difference between about 0.5p and about 14.4p per hand on average, or 50p against £14.40 over 100 hands. Our full 3:2 against 6:5 guide shows why the payout is the first thing to check at any table.
Single deck blackjack online: what the numbers look like
Online, single-deck blackjack is mostly an RNG game; live studio tables generally use larger shoes (Evolution's Lightning and Infinite tables use eight decks, for instance). An online game survey by Wizard of Odds lists Microgaming's Vegas single deck, dealt from one deck with the dealer hitting soft 17, at a 0.31% house edge. That's a useful example of a one-deck game carrying a rule (H17) that trims its advantage, yet still finishing with a low edge.
There's also a quirk in favour of online play. By Wizard of Odds' calculation, shuffling after every hand lowers the house edge slightly, by about 0.11% in a one-deck game against a game dealt down to a cut card. RNG blackjack reshuffles every round, so this small effect works for you.
Software studios name their games freely, so "single deck" in a title is not a promise of good rules. Read the help screen for the payout, dealer rule, doubling and splitting before deciding a game is good value.
How to check a single deck blackjack game in five steps
Open the help or rules screen and confirm it really is one deck.
Find the blackjack payout. If it says 6 to 5 or even money, the deck advantage has gone; look for 3 to 2.
Check whether the dealer stands or hits on soft 17.
Look at the doubling rules: any two cards, 9 to 11, or 10 and 11 only, and whether doubling after a split is allowed.
Note the published RTP if there is one, and compare it with other blackjack games in the lobby.
One-deck basic strategy: what changes
Basic strategy changes a little with the number of decks. Published charts for four to eight decks are built for multi-deck shoes, and a single-deck game has its own small set of different plays, mostly around doubling and splitting. If you play one-deck games regularly, use a chart made for one deck and the exact dealer rule of the table.
Some advice holds whatever the deck count. Always stand on hard 17 or more, always split aces and 8s in the multi-deck charts, and never take insurance. With one deck, insurance is a little less bad than with eight, but still a losing bet: ignoring your own cards, 16 of the 51 unseen cards are ten-value when the dealer shows an ace, and the 2 to 1 payout gives the house about 3/51, roughly 5.88%. From a full eight-deck shoe it's about 7.47%.
Card counting and the one-deck game
Single-deck games have a special place in blackjack history. Edward O. Thorp, regarded as the father of card counting, set out his methods in the 1962 book Beat the Dealer, at a time when one-deck games were common. With so few cards, the removal of each one mattered, and that's why casinos later moved to bigger shoes, cut cards and shuffling machines.
None of that applies to online RNG play. Software reshuffles at the start of each round, so there's nothing to track, a point both Wikipedia's card counting entry and Wizard of Odds make. Counting itself isn't illegal in Britain, but casinos can refuse service to suspected counters. Our pages on card counting and continuous shuffling cover the history and theory.
Myths about single deck blackjack odds
"Any single-deck game beats any shoe game." Not if it pays 6 to 5. As the worked example shows, that payout costs nearly three times what the single deck gives back.
"One deck means the dealer has to run out of good cards." Online games reshuffle every round, so each hand starts from a full, freshly mixed pack. There is no running out and nothing becomes due, as our gambler's fallacy page explains.
"Low edge means I'll win over time." A 0.3% edge still means the house is ahead on average. It just costs you less per hour than most casino games. See can you win at blackjack in the long run? for the honest answer.
Who single deck blackjack suits
Advantages
Worth about +0.48% against eight decks on identical rules
Naturals come up slightly more often
Insurance is less costly (though still not worth taking)
RNG versions reshuffle every round, trimming the edge a touch more
Drawbacks
Often paired with 6 to 5 or other costly rules
Mostly found as RNG, not live
Needs a one-deck strategy chart to play exactly
Names like 'single deck' or 'Vegas' don't promise good rules
It suits a player who reads rules before playing and wants one of the lowest-cost games in the lobby. Our lowest house edge games page shows where good single-deck blackjack sits against other options, and European blackjack and Atlantic City blackjack are useful multi-deck comparisons.
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Frequently asked questions
Is single deck blackjack better odds?
Yes, on identical rules. Wizard of Odds measures one deck at about +0.48% for the player compared with eight decks. The catch is that one-deck tables often carry worse rules, and a 6 to 5 blackjack payout alone costs 1.39%, more than the deck adds. Always compare the full rules or the published RTP. Our blackjack house edge page shows each rule's value.
What is the house edge of single deck blackjack?
It depends on the rules. Wizard of Odds gives one single-deck example at 0.05%, which rises to 1.44% if blackjack pays 6 to 5, and lists Microgaming's Vegas single deck, with the dealer hitting soft 17, at 0.31%. There's no single figure for every one-deck game, so check the help screen. Our house edge table compares other games.
What are the odds of getting blackjack with one deck?
About 4.83% from a full pack. You need an ace and a ten-value card: 4/52 for an ace first, then 16/51 for a ten-value card, doubled because the order can be reversed. From an eight-deck shoe the chance is about 4.75%. The small gap is one reason fewer decks help the player. Our blackjack odds page covers other hands.
Can you count cards in online single deck blackjack?
No. Online RNG blackjack reshuffles at the start of every round, so each hand comes from a full deck and there's nothing to track. Counting is legal in Britain, but it only ever worked in dealt games where the pack wasn't reshuffled each hand. Wizard of Odds also notes that shuffling every hand slightly lowers the edge. See card counting in online blackjack.
Is single deck blackjack available at live casinos?
It's rare. Live studio blackjack generally uses bigger shoes; for example, Wizard of Odds lists Evolution's Lightning and Infinite Blackjack as eight-deck games. One-deck blackjack is mostly found as an RNG game. Check each casino's table game lobby and each game's help screen for the deck count. Our online against live blackjack guide compares the two.
Should I play single deck blackjack that pays 6 to 5?
On the numbers, a 3 to 2 game with more decks is usually better. A 6 to 5 payout costs 1.39%, while one deck gives back about 0.48%, leaving you roughly 0.91% worse off than an ordinary eight-deck 3 to 2 game. On a £10 blackjack, 6 to 5 pays £12 instead of £15. Our 3:2 against 6:5 page explains.
Does basic strategy change in single deck blackjack?
Slightly. A handful of doubling and splitting plays differ from the four-to-eight-deck charts, so a one-deck chart for the table's dealer rule is the most accurate guide. Core advice stays the same: stand on hard 17 or more and never take insurance. The changes are small next to the cost of ignoring strategy altogether. Our strategy chart guide explains how to read one.
Can I use a casino bonus on single deck blackjack?
Check the terms first. Our partners' welcome offers are slot-focused, and table games are often excluded or count for less towards wagering. 10bet's bonus must be wagered on slots, and Casumo's has game restrictions and a £5 maximum bet. Never assume blackjack play counts. Our page can you play blackjack with a bonus? covers this.
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