Under a well-specified six-deck rule set, the blackjack house edge is about 0.4% with correct basic strategy. That assumes the dealer stands on soft 17, blackjack pays 3:2, doubling after a split is allowed, and surrender is not available.
That figure is not the chance the dealer beats you on the next hand. It is the long-run expected loss per initial bet after wins, losses, pushes, blackjacks, doubles and splits have all been counted. Bet £100 in total initial stakes at a 0.4% edge and the expected cost is 40p. You can still win the next hand. You can win the next hour. The edge is a long-run average, not a timetable.
The awkward part is that blackjack pages often quote one clean number without naming the rules behind it. That makes the number hard to check. Change 3:2 to 6:5 and the game moves from the low 0.4% benchmark towards the 1.8% example shown below. Make the dealer hit soft 17 and the edge moves again. The maths is useful only when the rule set is nailed down.
What is the house edge, exactly?
House edge is the casino’s average profit, expressed as a percentage of your initial bet, if the same rule set is played for a very large number of hands. In blackjack, that number assumes a particular strategy. The usual quoted figure assumes correct basic strategy, not guesses, hunches or copying the dealer.
For a six-deck game where the dealer stands on soft 17, blackjack pays 3:2, double after split is allowed, and there is no surrender, the house edge is about 0.4% with basic strategy. Put another way, £1,000 in initial bets has an expected loss of £4 under those rules.
The word expected does heavy work. Expected value is not a forecast for your next session. It is the weighted average of every possible result: ordinary wins, ordinary losses, pushes, blackjacks, doubles, splits and hands where the dealer also has blackjack. A double-down loss hurts more than a normal loss, but the double is made only in situations where the maths says the extra stake is worth it.
House edge is also not the same as hit rate. Blackjack players lose more hands than they win, because pushes exist and because blackjack payouts do some of the repairing. A 3:2 blackjack payout is one of the main reasons the edge can sit near 0.4% under good six-deck rules. Cut that payout and the edge jumps, even if every card is dealt in the same order.
Which rule set does that figure assume?
An edge quoted without rules is incomplete. These figures assume correct basic strategy and use the conventional house edge per initial bet.
| Rule set | Assumptions behind the quote | House edge | Decision that changes |
|---|---|---|---|
| Baseline six-deck 3:2 | Six decks, dealer stands on soft 17, blackjack pays 3:2, double after split allowed, no surrender | 0.4% | This is the clean benchmark for a strong multi-deck game |
| Dealer hits soft 17 | Same as baseline, except the dealer hits soft 17 instead of standing | 0.6% | Player loses value when the dealer can improve soft totals |
| No double after split | Same as baseline, except split hands cannot then be doubled | 0.6% | Good split hands lose one of their best follow-up options |
| Late surrender allowed | Same as baseline, but late surrender is available before playing the hand | 0.3% | Player can give up the worst hands for half a stake |
| Six-deck 6:5 payout | Same as baseline, except blackjack pays 6:5 rather than 3:2 | 1.8% | The natural blackjack bonus is cut, which is a major cost |
Rounded to one decimal, small rules can look equal even when they are not. The direction still matters. A 6:5 payout is not a cosmetic difference; it changes the game far more than most table rules.
How do you turn house edge into money at the table?
- Start with initial bets, not hands. House edge is normally quoted per initial stake. If you play 100 hands at £10 each, your initial-bet volume is £1,000. Doubles and splits create extra money on the table, but the standard edge figure has already allowed for the situations where they occur.
- Multiply by the edge. At 0.4% under the six-deck 3:2 stand-on-soft-17 baseline, £1,000 in initial bets has an expected loss of £4. At 1.8% under the same rules with a 6:5 blackjack payout, the same £1,000 has an expected loss of £18.
- Separate expectation from cash swings. A £10 player can easily be up or down many units in a short spell. Blackjack has lower volatility than many casino games because pushes, doubles and choices spread the results out, but the next 20 hands still do not owe you the average.
- Use the figure to compare games. If two tables are otherwise alike and one pays 3:2 while the other pays 6:5, the 3:2 table is the better mathematical deal. No betting pattern fixes a worse rule set.
- Keep the strategy assumption honest. The 0.4% quote is a basic-strategy quote. If you stand on hands that should hit, refuse profitable doubles, or split the wrong pairs, your personal edge is worse than the table edge.
Where do blackjack odds and blackjack RTP fit in?
Blackjack odds are the probabilities underneath the house edge. They answer questions such as how often you draw a natural blackjack, how often a dealer busts from a given up-card, or how often a pair split improves the hand. In a six-deck shoe, the chance your first two cards are a natural blackjack is about 4.7%. That fact matters because naturals are paid at a bonus rate under 3:2 rules.
Expected value joins those odds to the payout. A hand can be less likely to win but still be the right play if the payoff or saved loss is better. Doubling 11 against a weak dealer card is the familiar example: you risk more because the distribution of future cards makes the extra stake profitable on average.
Blackjack RTP is the same idea turned round from the player’s side. If the house edge is 0.4% for the six-deck 3:2 stand-on-soft-17 baseline with basic strategy, the blackjack RTP is 99.6%. If the edge is 1.8% for the same game with 6:5 blackjacks, the RTP is 98.2%.
RTP can sound more generous because it is a larger number. It is not a different measurement. A 99.6% RTP means the long-run expected return is £99.60 from £100 of initial bets under that exact rule set and strategy assumption. It says nothing about whether the next shoe is kind.
What changes the edge fastest?
- Blackjack payout. This is the first rule to check. Moving from 3:2 to 6:5 adds about 1.4 percentage points under otherwise similar six-deck rules. A baseline 0.4% game becomes about 1.8%. That is a large price for the player.
- Dealer soft 17 rule. If the dealer hits soft 17 instead of standing, the house edge rises by about 0.2 percentage points in a six-deck 3:2 game. The dealer gets another chance to turn a weak soft total into a made hand.
- Double after split. Allowing double after split helps the player because some split hands become strong doubling spots. Removing it moves a good six-deck 3:2 game from about 0.4% to about 0.6%, assuming the other baseline rules stay the same.
- Surrender. Late surrender helps because you can abandon the worst starting positions for half the initial stake. Under the six-deck 3:2 stand-on-soft-17 baseline, adding late surrender moves the edge to about 0.3% with correct use.
- Basic strategy accuracy. The printed rules do not play the hand for you. The cost of mistakes depends on the exact mistake and how often it appears. Standing on 16 against a dealer 10 in the wrong surrender context, skipping strong doubles, or splitting tens will damage the result faster than most players expect.
- Deck count, only after the big rules. Fewer decks can help the player if the rules stay identical, because blackjacks and doubles shift slightly. In real games, deck count often arrives bundled with other rules, so compare the whole package rather than treating decks as the answer.
Frequently asked questions
Yes. Blackjack can sit below a 1% house edge when the rules are player-friendly and you make basic-strategy decisions. The edge is not low because the dealer is easy to beat; it is low because many close hands have a mathematically correct play. Guessing, taking insurance, or playing a 6:5 payout pushes the game away from that small figure.
0.5% means an average loss of 50p per £100 wagered over a very large number of hands. It does not mean you lose 50p every 100 hands, and it does not cap your losses. It is the long-run price of the rules, assuming you make the right decisions.
The common misconception is that a small edge makes short sessions safe. The correction is that house edge describes the average after many hands, while single sessions are ruled by variance. You can play perfect basic strategy, get dealt stiff hands into dealer 20s, and lose quickly. You can also play badly and win tonight.
You have 16 against a dealer 10. It feels natural to stand and hope the dealer breaks, but basic strategy usually says hit, unless the 16 is a pair or the exact rules change the play. One wrong choice is a small leak. Repeating that leak across hundreds of hands is how a low-edge game becomes an expensive one.
It depends on the rule set: deck count, whether the dealer stands on soft 17, blackjack payout, double rules, split rules, surrender, and peeking rules all matter. It also depends on whether the quoted figure assumes basic strategy. A table can look like blackjack and still have a very different price.
Compared with 6:5 Blackjack, a 3:2 blackjack game pays much more on your best natural hand. A £10 blackjack pays £15 at 3:2 but £12 at 6:5. That one rule alone adds about 1.4 percentage points to the house edge, which is huge in a game where players argue over tenths of a percent.
Follow basic strategy. The exception is that the chart must match the rules you are actually playing. A six-deck game where the dealer stands on soft 17 is not the same as Single Deck Blackjack or European Blackjack. If the rules change, the best move can change too. A hunch is not an exception.
Most people treat close hands as personality tests: “I never hit 16”, “I always split 10s”, or “insurance feels safe”. Blackjack is priced around those instincts being wrong often enough. The biggest mistake is not one dramatic blunder; it is replacing a tested chart with habits, especially on hard 12 to 16 against strong dealer upcards.
Variance is the swing between the mathematical average and what actually happens in a short run. The house edge can be half a percent and your session can still finish far above or below that. Double downs, splits, blackjacks, and dealer streaks make the line jagged. The edge is the slope, not the path.
Use the built-in basic strategy trainer in Blackjack and treat corrections as the real lesson. Play a run of hands, note the decisions it flags, and look for repeats. If you keep missing the same spots, learn those first. The edge improves fastest when you fix frequent errors, not rare exotic hands.
Nobody knows precisely, because “average player” hides too much: different rules, different charts, different guesses, different session lengths. The best available anchor is that a good six-deck 3:2 game with the dealer standing on soft 17 is roughly a half-percent game when played correctly. Casual play is higher, sometimes much higher.
In 1956, Roger Baldwin, Wilbert Cantey, Herbert Maisel and James McDermott published one of the first serious mathematical treatments of blackjack strategy. Edward O. Thorp later made blackjack maths famous with Beat the Dealer in 1962. Modern basic strategy is not folklore. It comes from calculation, then checking, then more calculation.
The cost of getting it wrong is steady leakage on a bet that feels protective. Insurance pays 2:1, so it needs the dealer’s hole card to be ten-value at least one-third of the time. In a fresh six-deck shoe, without extra information, that condition is not met. Basic strategy therefore says no insurance.
Final thoughts
If a friend asked which blackjack number to remember before choosing a table, I would give them the edge and the habit that goes with it. The number is 0.4% for a solid six-deck 3:2 game where the dealer stands on soft 17 and basic strategy is played. The habit is to ask what rules made that number true.
The payout line matters most. A table that pays 6:5 can look identical for five quiet hands, then take value away on the very hand that should be your premium result. Soft 17 matters too, but it is smaller. Surrender is useful, but only if you actually use it in the right places. Basic strategy is not decoration; it is part of the quoted maths.
Do not use house edge as a promise about tonight. Use it as a price tag. If the price is low, you are still buying variance, just at a fairer rate. If the price is high, a lucky run can still happen, but the game is charging more for the same entertainment. The cards will be noisy. The rules are not.
-
Blackjack
Why 6:5 Blackjack Costs You Nine Times More
6:5 blackjack adds about 1.4 percentage points to the house edge, enough to make a favourable single-deck game roughly nine times dearer.
12 August 2026
-
FreeCell
Baker's Game vs FreeCell: One Rule, Twice the Difficulty
Baker's Game is the harder FreeCell variant: play FreeCell first for fluency, then Baker's Game when ordinary FreeCell feels too forgiving.
12 August 2026
-
FreeCell
FreeCell Game 11982: The Deal Nobody Can Win
FreeCell 11982 is famous because it is not merely difficult: under Microsoft deal numbering, exhaustive solvers classify it as unwinnable.
12 August 2026