What is the house edge on blackjack? With perfect basic strategy and good rules, it is roughly 0.5%, meaning the casino keeps about 50p of every £100 staked over a long run. Play by instinct and it can rise to several per cent, and some rule changes, such as paying blackjack at 6:5, add more than a full percentage point. Below are the numbers, rule by rule, with UK-specific context.
Blackjack’s house edge is about 0.5% with perfect basic strategy on favourable rules.
Your decisions matter: guesswork or copying the dealer can push the edge to around 5%.
Rules such as 6:5 payouts, dealer hitting soft 17 and fewer doubling options each add to the edge.
Insurance and most side bets carry far higher edges than the main game.
Typical edge, basic strategy
About 0.5% (rule-dependent)
Edge without strategy
Several per cent
Blackjack payout
3:2 standard; 6:5 adds about 1.4%
Insurance edge (multi-deck)
About 7%
Min game cycle (RNG, GB)
5 seconds since 17 January 2025
What is the house edge on blackjack? The quick answer
The house edge on blackjack is usually between about 0.4% and 0.6% for a multi-deck game with standard rules, provided you follow basic strategy on every hand. That makes it one of the lowest-edge games in a casino lobby, alongside baccarat’s banker bet and some video poker. The house edge is the average percentage of each stake the casino keeps over a very long run.
Two things make blackjack unusual. First, the edge depends on your choices, because you decide when to hit, stand, double or split. Second, the precise figure depends on the table rules, which vary from game to game. That is why one blackjack table can cost several times more to play than another that looks almost identical.
A low edge still means losses are likely over time. It describes the average cost of play, not a way to win.
How the blackjack house edge is calculated
Blackjack has no fixed probabilities in the way roulette does, because the deck changes as cards are dealt and players make different decisions. Mathematicians work out the edge by simulating or calculating billions of hands under a set of rules, assuming the player makes the best decision every time. The advantage for the casino comes from one simple asymmetry: if you bust, you lose immediately, even if the dealer later busts too.
Several rules push back in the player’s favour: a natural blackjack pays 3:2, you can double down and split, and in some games you can surrender. The net of all those effects is the figure quoted for a game. For full tables of rule variations, the Wizard of Odds blackjack guide (opens in a new tab) is a widely used independent reference.
Blackjack rules that change the house edge
Start from a baseline multi-deck game where the dealer stands on soft 17, blackjack pays 3:2 and you can double after splitting. Each rule change below moves the edge by roughly the amount shown. The figures are approximate and interact slightly with each other, but they show which rules matter most.
Approximate effect of common rule changes on the blackjack house edge
Rule change
Effect on house edge
What it means for a £10 hand
Blackjack pays 6:5 instead of 3:2
About +1.4%
About 14p more lost per hand on average
Dealer hits soft 17
About +0.2%
About 2p more per hand
No doubling after a split
About +0.15%
About 1.5p more per hand
Double only on 10 or 11
About +0.2%
About 2p more per hand
Dealer takes no hole card and keeps all doubles and splits on blackjack
About +0.1%
About 1p more per hand
Late surrender allowed
About −0.08%
About 0.8p less per hand
Fewer decks (eight down to one)
Up to about −0.5%
Up to 5p less per hand
The single most expensive change is the 6:5 payout on a natural. On a £10 blackjack, 3:2 pays £15 and 6:5 pays £12. Because a natural arrives in about one hand in 21, that £3 gap adds up to more than all the other common rule tweaks combined. Check the payout printed on the table felt or in the game’s help screen, which you can learn to read in our guide to blackjack rules.
How much does your play change the blackjack house edge?
Basic strategy is a chart of the mathematically best play for every combination of your hand and the dealer’s up card. Following it does not guarantee a win on any hand, but it minimises the long-run cost. Most players who deviate do so in predictable ways: standing on 12 to 16 against a high dealer card, never doubling, or splitting tens.
House edge by playing style on a typical multi-deck game
Playing style
Approximate edge
Average cost of 100 hands at £10
Perfect basic strategy
About 0.5%
About £5
Basic strategy with occasional mistakes
About 1% to 2%
About £10 to £20
Never bust (stand on 12 or more)
Around 4%
About £40
Copy the dealer (hit to 17, no doubles or splits)
Around 5% to 6%
About £50 to £60
The gap between the first and last rows is enormous for a game whose cards are identical. In practice, keeping a strategy chart open alongside an online game is allowed at most casinos and is the simplest way to stay near the bottom of that range.
Insurance and side bets: where the edge jumps
When the dealer shows an ace, many tables offer insurance, a side bet that pays 2:1 if the dealer has blackjack. With multiple decks it carries an edge of about 7%, roughly fourteen times the main game, so basic strategy says never take it. ‘Even money’ on your own blackjack is the same bet under another name.
Blackjack side bets such as Perfect Pairs and 21+3 work the same way. Their edges vary by paytable but are commonly several per cent or more. They make the game more varied, but each pound placed on them costs far more on average than a pound on the main hand. The help screen shows the RTP for every side bet.
House edge on live and RNG blackjack
RNG blackjack typically reshuffles a virtual shoe after every hand, while live blackjack usually deals from a multi-deck shoe with a cut card. With the same rules, the edge is essentially the same in both formats. Variants change things: ‘infinite’ formats let unlimited players share one hand, ‘free bet’ games give free doubles and splits but pay a push when the dealer reaches 22, and ‘power’ variants alter doubling rules. Each publishes its own RTP in the help screen.
Card counting, which tracks the ratio of high to low cards left in a shoe, cannot work on RNG games that reshuffle every hand. Live shoes are typically cut well before the end, which limits any advantage, and casinos can restrict accounts they suspect of advantage play. Our page on card counting online covers this in detail.
UK rules on online blackjack
Since 17 January 2025, the Gambling Commission’s game design rules for slots have been extended to other online casino games. For RNG blackjack that means each game cycle must take at least 5 seconds, autoplay is not allowed and your net position and session time must be shown. The Commission explains the reasoning in its speed of play consultation response (opens in a new tab). Our page on table game speed rules sets out the detail.
Blackjack is not covered by the £5 and £2 online slot stake limits, which apply only to reel-based slots. Table limits are set by the casino. With a bonus active, the terms usually set a maximum bet and may weight blackjack at a low percentage towards wagering, or exclude it altogether.
Worked example: what blackjack costs per hour
Expected cost equals stake × hands × edge. Take a £10 stake and three scenarios:
Live table, perfect strategy: about 60 hands an hour × £10 × 0.5% = about £3 an hour on average.
Live table, rough play at 2%: 60 × £10 × 2% = about £12 an hour.
RNG table at the 5-second minimum: up to 720 hands an hour in theory × £10 × 0.5% = about £36 an hour, even with perfect play.
Faster play multiplies the number of bets, so the RNG version can cost more per hour despite the same edge. Short-term results swing far more widely than these averages; doubling and splitting also raise the amount at risk on some hands. A gambling budget helps keep any session within what you are comfortable spending.
How to check the house edge before you play
Open the blackjack game and find the ‘i’, help or rules button.
Note the blackjack payout (3:2 or 6:5), the number of decks and whether the dealer hits or stands on soft 17.
Look for the stated RTP; house edge is 100% minus RTP.
Check the RTP of any side bets separately.
Compare with other tables in the lobby before choosing one.
Keep a basic strategy chart for those rules alongside the game.
For a broader view, our guide to low house edge games compares blackjack with baccarat, roulette and video poker, and the casino questions hub answers related queries.
Where to play blackjack with UK-licensed casinos
Coral and PlayOJO are licensed by the UK Gambling Commission; check each lobby for the blackjack tables currently offered and their help screens for rules and RTP. Their welcome offers are slot spins rather than blackjack bonuses. At Coral, a new customer who deposits and stakes £10 on slots receives 100 free spins worth 10p each on selected games; they must be accepted within 48 hours, last 7 days and carry no wagering on winnings, and some payment methods are excluded. At PlayOJO, a first deposit of £10 or more brings 80 free spins worth 10p each on Big Bass Bonanza, with winnings paid in cash (new UK customers, Northern Ireland excluded). 18+, terms apply. For blackjack-specific promotions in general, see our blackjack bonus page.
Neither offer is a blackjack bonus: Coral’s 100 free spins need a £10 slots bet and PlayOJO’s 80 free spins come with a £10 first deposit. 18+, terms apply.
Significant terms: 18+. New players only. Offer runs 01/10/2026 to 01/02/2027. Deposit (certain types excluded) and bet £10+ on slot games to get 100 free spins (selected games, £0.10 each, 48 hrs to accept, valid 7 days). No wagering on free spin winnings. Deposits by Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards do not qualify. Restrictions and T&Cs apply. GamCare.org.uk
Read the Coral reviewLicence: LC International Limited, UKGC account 54743. Offer checked 5 October 2026.
Significant terms: 18+. New UK customers (excluding Northern Ireland). First deposit only. Minimum deposit £10. 80 free spins on Big Bass Bonanza, £0.10 each. No wagering requirements; winnings paid in cash. Cannot be used with any other offer. Only available to players who arrive through the designated offer link. Full T&Cs apply. GamCare.org.uk
Read the PlayOJO reviewLicence: Skill On Net Limited, UKGC account 39326. Offer checked 5 October 2026.
18+. Gambling should be entertainment that costs money, not a way to make it. Set a deposit limit before you play: how to set deposit limits. Free, confidential help: National Gambling Helpline 0808 8020 133.
Frequently asked questions
What is the house edge on blackjack with basic strategy?
With perfect basic strategy on a typical multi-deck game, the house edge is roughly 0.4% to 0.6%. The exact figure depends on rules such as the number of decks, whether the dealer hits soft 17, doubling options and the blackjack payout. At 0.5%, the average cost is 5p per £10 hand, though individual sessions swing far more. That low figure assumes every decision follows the chart, which few players manage in practice. Our basic strategy page explains how the chart is built.
How high is the blackjack house edge without strategy?
Without strategy, the house edge on blackjack typically rises to several per cent. Copying the dealer, by hitting to 17 and never doubling or splitting, gives the casino an edge of around 5% to 6%, because you lose every hand where you bust first. Never busting by standing on 12 or more is around 4%. Even small, regular mistakes can lift a 0.5% game to 1% or 2%. Learning a few key decisions closes most of the gap; see blackjack rules for the basics.
Is blackjack the casino game with the lowest house edge?
Blackjack is among the lowest, but whether it is the very lowest depends on the rules and your play. With perfect strategy and good rules it sits around 0.5%, comparable with some full-pay video poker and lower than baccarat’s banker bet at about 1.06%. Played without strategy, it can be worse than European roulette at 2.70%. Comparing like for like matters, which is why our best odds casino games guide lists figures under stated conditions.
Why does 6:5 blackjack have a higher house edge?
A 6:5 payout reduces what you receive for a natural blackjack from 1.5 times your stake to 1.2 times. On a £10 hand, that is £12 instead of £15. Naturals turn up in roughly one hand in 21, so the lost £3 each time adds about 1.4 percentage points to the house edge, more than any other common rule change. A 6:5 game with otherwise good rules can therefore cost about three times as much as a 3:2 game. Check the felt or help screen; see our blackjack guide.
Should I ever take insurance in blackjack?
For players using basic strategy, insurance is never the right choice. It is a side bet that the dealer has blackjack, paying 2:1, and with multiple decks it carries an edge of about 7%. Only a card counter tracking an unusually ten-rich shoe could find it worthwhile, which does not apply to RNG games that reshuffle every hand. ‘Even money’ on your own natural is the same bet. Our glossary entry on insurance shows the maths in more detail.
Is the house edge different on live blackjack?
With the same rules, live and RNG blackjack have essentially the same house edge. Differences come from the rule sets of particular variants, such as infinite, free bet or power formats, each of which publishes its own RTP. Live play is slower, so the hourly cost is usually lower for the same stake. Live shoes are often cut well before the end, which limits card counting. Our comparison of live vs RNG games covers the other practical differences.
Does the number of decks change the blackjack house edge?
Yes, more decks slightly increase the house edge. Moving from a single deck to eight decks, with all other rules the same, adds up to about half a percentage point. Fewer decks make naturals a little more likely and help doubling decisions. Online RNG games and live shoes usually use six or eight decks, so single-deck games are uncommon. The rules or help screen lists the deck count for every table. The Wizard of Odds blackjack guide (opens in a new tab) gives exact figures for each combination, and our table limits page covers stakes.
Do blackjack bonuses lower the house edge?
A bonus can offset part of the expected cost, but blackjack usually contributes little or nothing to wagering. Many terms weight blackjack at 10% or less, or exclude it, because its low edge would make a bonus too cheap to clear. Since 19 January 2026, wagering is capped at 10x the bonus in Great Britain. Read the game weighting and maximum bet terms before opting in. Our guide to game weighting shows how contributions work in pounds.
Can card counting beat the house edge online?
Card counting cannot work on RNG blackjack, because the virtual shoe is normally reshuffled after every hand. On live tables the shoe is usually cut early, which reduces any benefit, and casinos can limit stakes or close accounts they suspect of advantage play. In practice, the realistic aim is to keep the edge near 0.5% with basic strategy, not to overturn it. Our card counting online page explains why the conditions rarely favour counters.
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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