Blackjack has the lowest house edge of any standard casino game, as low as 0.5% for a player using optimal basic strategy. That compares to 2.7% for European roulette and 5.26% for American roulette. For every $1,000 wagered, a skilled blackjack player faces an expected loss of $5 versus $27 for roulette. This mathematical advantage makes blackjack the most favourable game for players who are willing to learn strategy.
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| Rule | Player Friendly Version | House Effect |
|---|---|---|
| Blackjack payout | 3:2 (pay $15 on $10 bet) | 6:5 payout adds +1.4% house edge; avoid |
| Dealer soft 17 | Dealer stands on soft 17 | Dealer hits soft 17 adds +0.2% house edge |
| Number of decks | Single deck | Each additional deck adds slight house edge |
| Double down rules | Double on any two cards | Restrictions reduce player options |
| Surrender | Late surrender available | Adds ~0.07% player advantage when available |
Basic strategy is the mathematically correct decision for every hand. Key rules every player should know before playing:
Want to understand more about casino odds?
Our house edge guide explains how the mathematical advantage works across all games, and ourRTP guide covers how return-to-player percentages are calculated and verified.
0.5% or less with optimal basic strategy. The biggest variable is payout: 3:2 for blackjack is standard; 6:5 payout adds 1.4% to the house edge and should be avoided. Always check payout odds before playing any blackjack variant.
A mathematically optimal decision chart for every player hand vs dealer upcard. Using basic strategy reduces the house edge to its minimum theoretical value. Most online casinos allow you to use a strategy chart; it is not considered cheating.