House Advantage in Blackjack

Editorially reviewed: October 30, 2026.

House edge is a long-run mathematical expectation under stated rules and a stated playing strategy. It is not the percentage you must lose each visit, a limit on losses, or the same statistic as a casino’s reported win divided by cash dropped at the tables.

What does a 0.5% house edge mean?

For an illustrative game with a 0.5% edge measured against original wagers, 100 hands at an initial bet of $10 create $1,000 of initial action. The expected loss is $1,000 × 0.005 = $5. This is arithmetic using an assumed edge, not a quote for every blackjack table.

You can win, lose much more than $5, or finish close to even. Splits and doubles require extra money during play; do not confuse your starting bankroll, cumulative action and expected loss. Changing stakes after a loss does not change the underlying expectation.

How table rules change the edge

The following figures are approximate changes in the house edge, in percentage points. They reverse the sign of the player-return effects in the source. They are rule comparisons, not standalone house edges.

The source uses a reference game; deck count and other rules affect the exact result. Do not simply add these figures to an advertised edge or assume all effects combine without interaction. Wizard of Odds rule-variation analysis

3:2 versus 6:5 in cash

On a $20 qualifying blackjack, 3:2 pays $30 profit; 6:5 pays $24. The difference is $6 on that result. This payout comparison is not a $6 charge on every hand, and a normal 21 made with three cards is not a two-card blackjack.

Calculate the game you are actually playing

Record deck count, soft-17 rule, blackjack payout, double restrictions, split rules, surrender and how dealer blackjack is handled. Then choose the matching strategy chart. The Wizard of Odds calculator distinguishes strategy and shuffle assumptions; use the result that matches the game rather than mixing outputs.

In a 2017 post we reported on a Wizard of Odds study comparing online blackjack games from several software providers, with house edges ranging from 0.21% for Cryptologic’s single-deck game to 1.28% for Amigotech’s 6:5 game. Those figures date from 2017, so check the rules of the game you play.

Expected loss is not a session forecast

A lower edge improves the mathematical comparison, but stake size and the amount of play also matter. A larger stake can outweigh a small improvement in rules. Budget only what you can afford to lose and stop at your chosen limits. Our bankroll guide explains risk; it does not make a negative-expectation game profitable.

Bonuses and side bets need separate checks

A headline bonus does not automatically reduce the edge of your main hand. Check eligible games, wagering requirements, maximum bets, withdrawal restrictions and expiry. Evaluate each side bet using its own pay table. Avoid carrying a main-game edge over to an unrelated wager.