Blackjack Basic Strategy Guide

What basic strategy is

Basic strategy is the mathematically optimal action — hit, stand, double, split, or surrender — for every possible combination of your hand and the dealer's upcard. It's derived from computer simulation of millions of hands, not intuition, and playing it correctly brings the house edge down to roughly 0.5% on a standard table (the exact figure depends on the table's specific rules).

Why it works

Every decision in blackjack is a fixed-information problem: you know your total, you know the dealer's upcard, and the odds of the dealer busting or making a strong hand from that point are calculable. Basic strategy simply always picks the action with the best expected outcome for that specific situation.

A few high-level rules of thumb

• Always split Aces and 8s. Two Aces or two 8s make a weak hand (12 or 16) but two strong starting hands when split.
• Never split 10s or 5s. A pair of 10s is already a strong 20; a pair of 5s plays better as a hard 10 (a good doubling total).
• Hit hard totals of 8 or less; stand on hard 17 or more.
• Hit hard 12–16 when the dealer shows a strong upcard (7 through Ace); stand when the dealer shows a weak upcard (2 through 6), since the dealer is more likely to bust.
• Double down on hard 11 against almost any dealer upcard.

Use a chart

These rules of thumb cover common cases, but real basic strategy has an exact answer for every hand. See the strategy chart guide for how to read and use a full chart, and note that the correct chart depends on the exact table rules you're playing.

Where the ~0.5% house edge figure comes from

That commonly cited figure assumes a fairly standard, moderately generous rule set (multiple decks, dealer stands on soft 17, 3:2 blackjack payout) played with perfect basic strategy on every hand. Change the rules — say, a 6:5 payout instead of 3:2 — and the house edge with perfect basic strategy climbs noticeably higher, which is part of why understanding blackjack rules matters alongside strategy itself.

More rules of thumb, beyond the basics

• Double down on soft totals like A-2 through A-7 against a weak dealer upcard (4, 5, or 6) — the dealer is likelier to bust, and the flexible soft hand can't bust from the extra card.
• Split 9s against a dealer 2–6, 8, or 9, but stand against a dealer 7, 10, or Ace — a pair of 9s (18) is often already strong enough to stand against those specific upcards.
• Never take Insurance, even with a strong hand — it's a side bet on the dealer having blackjack, and it carries a high house edge for players not counting cards.
• Surrender hard 16 against a dealer 9, 10, or Ace where late surrender is offered — a hard 16 is one of the weakest possible hands, and giving up half your bet is often better than playing it out against those upcards.

Going deeper on each decision type

The rules of thumb above are a useful starting point, but each decision type has enough nuance to deserve its own dedicated breakdown once you're ready to go beyond the high-level shape of the game. For hitting and standing specifically, including the exact dealer-upcard thresholds that determine the 12–16 range, see when to hit or stand in blackjack. For every doubling situation, hard and soft, see when to double down in blackjack. For a full pair-by-pair breakdown of splitting decisions, see when to split pairs in blackjack. And for the two side decisions that don't fit neatly into the hit/stand/double/split framework, see blackjack insurance explained and blackjack surrender explained.

If you want the complete picture — strategy combined with table selection, bankroll management, and bet sizing discipline — our complete blackjack strategy guide ties every piece together into one framework.

Why "playing by feel" costs you money

Basic strategy sometimes recommends actions that feel counterintuitive — hitting a stiff hand like hard 16, or standing on a "weak-looking" hard 12 against a dealer 4, 5, or 6. These recommendations exist because they're the mathematically best choice given the full range of cards the dealer could be holding, not because they feel safe. Deviating based on gut feeling consistently costs players expected value over time.

Frequently asked questions

Is basic strategy the same as card counting? No — basic strategy is a fixed set of optimal decisions based only on your hand and the dealer's upcard, usable on any single hand in isolation. Card counting tracks the composition of the remaining shoe across many hands to adjust bets and strategy, and isn't practical or, in many contexts, permitted on most online blackjack formats.

Does basic strategy guarantee I'll win? No — it minimizes the house edge over the long run, but any individual hand's outcome is still determined by the cards dealt. The house edge is small with correct play, not zero.

Do I need a different basic strategy for every table? The core logic (splits, doubles, hit/stand thresholds) stays largely similar across rule sets, but the exact correct action for some specific hand-and-upcard combinations does shift with the rules — use a strategy chart matched to the table you're actually playing.

What's the fastest way to start applying basic strategy without memorizing everything at once? Start with the highest-impact, easiest-to-remember rules first — always split Aces and 8s, never split 10s, double hard 11, and stand on hard 17 or above. These few rules alone cover a large share of your decisions correctly, and you can layer in the more nuanced hand-by-hand cases from the full strategy chart as you get more comfortable.