Blackjack Basic Strategy

Basic strategy is the single most valuable thing a blackjack player can learn — and unlike every betting system on this site, it genuinely changes your expected results. Derived from computer analysis of millions of hands, it gives the mathematically correct action for every possible situation: your hand versus the dealer’s upcard, nothing else. No intuition, no hunches, no superstition.

Why it works

Blackjack is the rare casino game where your decisions matter. Every hit, stand, double and split changes the hand’s expected value, and for each combination of your total and the dealer’s visible card there is exactly one action that loses the least (or wins the most) in the long run. Playing that action every single time cuts the house edge from the ~2% of a “feel” player to roughly 0.5% under good rules — the best odds you can get in a casino without counting cards.

Three principles explain most of the chart:

• The dealer’s weak cards (4, 5, 6) do your work. When the dealer is likely to bust, you stand on stiff hands and double aggressively.
• Your hand is not a fortune to protect. Hitting a 16 against a dealer 10 feels terrible and is still correct — standing loses more.
• Doubles and splits are where the money is. Basic strategy’s edge comes less from avoiding busts than from betting more in the exact spots where you’re favored: 11 vs anything but an ace, pairs of 8s and aces, soft doubles against weak dealers.

The interactive chart

Use the chart below: pick the tab for your hand type (hard totals, soft totals or pairs), find your hand’s row and the dealer’s upcard column. Tap any cell for the action in plain language.

(Chart assumes multi-deck, dealer stands on soft 17, double-after-split allowed. “Double” becomes Hit when doubling isn’t permitted — except A,7 vs 3–6, which becomes Stand.)

The hands players get wrong most often

Situation	Correct play	Why
16 vs dealer 10	Hit	You lose either way — hitting loses less
12 vs dealer 2 or 3	Hit	The dealer busts too rarely to protect a 12
A,7 (soft 18) vs 9, 10, A	Hit	18 is a losing total against strong upcards
8,8 vs dealer 10	Split	Two 8s beat one 16 — the worst hand in the game
10,10 vs anything	Stand	Never break a 20; the “double win” is a long-term loss
11 vs dealer 10	Double	You’re the favorite — bet like it

How to learn it fast

Don’t memorize 300 cells; learn the patterns. Start with the hard totals (they cover most hands), then the always/never rules — always split aces and 8s, never split 5s and 10s, always double 11 against 2–10 — then the soft totals last. Drill until answers are instant, because hesitation at a real table invites bad advice from neighbors.

Once basic strategy is reflexive, two paths continue from here: our card counting guide explains the only technique that ever pushed the edge past zero (and its honest limits online), and the Hi-Lo trainer — with its live counter mode — lets you practice both skills together. Whatever you do, size your session with the bankroll calculator first: even at 0.5% edge, variance is brutal.