Blackjack Basic Strategy: The Mathematically Optimal Way to Play
Blackjack is the only casino game where your decisions directly affect the outcome. Unlike slots or roulette, every hand presents a choice—hit, stand, double down, split, or surrender. Basic strategy is a complete set of rules, derived from computer simulations of millions of hands, that tells you the statistically best play for every possible combination of your hand and the dealer's upcard.
What Is Basic Strategy?
Basic strategy was first developed in the 1950s by mathematicians who used early computers to simulate every possible blackjack scenario. The result is a chart that covers every situation: your two-card hand versus each possible dealer upcard. Following this chart perfectly reduces the house edge to approximately 0.5%, making blackjack one of the best-value games in any casino. Without basic strategy, the average player gives the house a 2% to 5% edge through suboptimal decisions.
Key Decision Rules
**When to Hit:** Hit on hard totals of 8 or below regardless of the dealer's card. Hit on hard 12 when the dealer shows 2 or 3. Hit on hard 13 through 16 when the dealer shows 7 or higher—these are the tough spots where most players make mistakes by standing out of fear.
**When to Stand:** Stand on hard 17 or higher regardless of the dealer's card. Stand on hard 13 through 16 when the dealer shows 2 through 6, because the dealer has a higher probability of busting.
**When to Double Down:** Double on hard 11 against any dealer card except an ace. Double on hard 10 against dealer 2 through 9. Double on hard 9 against dealer 3 through 6. Doubling lets you put more money on the table in your most favorable situations.
**When to Split:** Always split aces and eights. Never split tens or fives. Split twos and threes against dealer 2 through 7. See our [state guide](/states) to find regulated casinos offering standard blackjack rules. Use our [wagering calculator](/tools/wagering-calculator) to see how the lower house edge affects bonus clearing.
Common Mistakes to Avoid
Standing on 16 versus a dealer 10 feels safe but is mathematically wrong—you should hit. Taking insurance is a sucker bet with a house edge over 7%. Splitting tens destroys a strong hand for two mediocre ones. Playing by hunches instead of the chart costs you real money over hundreds of hands.
Learning and Practicing
Print or save a basic strategy chart and reference it while you play. Online casinos allow unlimited time per decision, so there is no pressure to memorize everything at once. Many regulated casinos offer free play or demo modes where you can practice without risking money. After several hundred hands, the correct plays become second nature.
Pros and Cons
Pros of basic strategy:
Cons of basic strategy:
Frequently Asked Questions
Does basic strategy work at online casinos?
Yes. Basic strategy applies to any standard blackjack game regardless of whether it is online or in person. Online casinos use random number generators or live dealers that follow the same rules.
Can basic strategy make me a winning player?
Basic strategy minimizes your losses to about 0.5% per hand on average, but it does not eliminate the house edge. You will still lose money over the long run. Card counting can theoretically shift the edge to the player, but it is not practical at online casinos.
Should I use a strategy chart at the table?
Absolutely. Online casinos have no rules against referencing a chart, and most land-based casinos also allow it. There is no reason to play from memory until you have the chart fully memorized.