Blackjack Basic Strategy Charts Explained

The short answer

Basic strategy is a single chart that tells you the mathematically best move for every hand you can hold against every dealer up card. Play it perfectly in a good multi-deck game and you cut the house edge to roughly 0.5% (Wizard of Odds). It isn't a betting system or a guess. It's the solved answer to a game that never changes its rules.

Why does a single chart beat guessing?

The dealer follows a fixed script. They must draw to 16 and stand on 17 or higher, with no choices allowed. Because their behaviour is predictable, every one of your decisions has one correct answer that wins the most (or loses the least) over the long run.

Four US Army mathematicians worked this out by hand in 1956, using adding machines at the Aberdeen Proving Ground. Their paper, "The Optimum Strategy in Blackjack," ran in the Journal of the American Statistical Association (vegas-aces.com). Modern computers have since checked every cell across billions of hands. The chart below is that consensus answer.

This article is the full reference. If you're brand new, start with the blackjack basic strategy lesson in our Table Games Essentials course, which covers the ten rules worth memorising first. Come back here when you want every cell. For the rules themselves, the blackjack rules lesson is a good starting point, and Blackjack Explained walks through the basics.

How do you read these charts?

These charts assume the most common casino rule set: 4 to 8 decks, dealer hits soft 17, double after split allowed, 3:2 blackjack payouts. That's what you'll meet at most Vegas tables and most online blackjack, including the games on the blackjack category page.

Find your hand down the left column and the dealer's up card across the top. The cell where they meet is your move.

A "soft" hand contains an ace counted as 11, so it can't bust on the next card. A "hard" hand has no ace, or an ace forced to count as 1.

Hard totals: what should you do?

Hard totals are hands with no flexible ace. This is where most of your decisions live. Notice the clean block of standing against a dealer 2 through 6, and the wall of hitting against 7 through ace.

These hard-total values match the published 4-8 deck, hit-soft-17 chart (Blackjack Apprenticeship). One quirk stands out: you double an 11 even against a dealer ace under this rule set, which differs from stand-on-soft-17 games.

Soft totals: how do aces change things?

A soft hand can't bust on one card, so the chart gets aggressive with doubling. You're trying to squeeze extra bets in when the dealer looks weak, and you fall back to hitting when they don't.

The soft-total doubling ranges here follow the Blackjack Apprenticeship H17 chart (Blackjack Apprenticeship). Watch soft 18 (A,7): it's a strong-looking hand that still gets beaten often, so you double against weak dealer cards and only stand pat against a 7 or 8.

Which pairs should you split?

Splitting turns one hand into two, with a second bet. Do it when two separate hands beat one combined total, or when you can turn a bad hand into two promising ones. This chart assumes doubling after a split is allowed.

Two rules never bend and are worth memorising cold: always split aces and 8s, never split 5s or 10s (Wizard of Odds). A pair of 5s is a hard 10 — a great doubling hand you'd ruin by splitting. A pair of 10s is already a 20, so you leave it alone.

Late surrender, where offered, adds a few moves: surrender hard 16 against a 9, 10, or ace, and hard 15 against a 10. Under hit-soft-17 rules you also surrender 15 and 8,8 against an ace (Blackjack Apprenticeship).

Why does the chart work?

Two facts drive every cell: the dealer's fixed script and finite-deck math.

Because the dealer must keep hitting until they reach a hard 17, a low up card like a 5 or 6 is genuinely weak — they'll bust often. So you stand on stiff totals of 12 through 16 and let them take the risk. Against a 7 or higher, the dealer will likely make a strong hand, so you have to improve yours or lose by default.

There are only so many tens and aces in the shoe. Roughly a third of the cards are worth ten, which is why an 11 doubles so freely and why a dealer showing a small card is in trouble. The chart is simply the move that wins most across every possible card that can come next. Deck count nudges a handful of cells; we cover that in How the Deck Count Changes Blackjack.

What changes if the dealer stands on soft 17?

Not much — and that's the point. Learn the hit-soft-17 chart above and you're covered almost everywhere. Only a few hands play differently when the dealer stands on soft 17 (S17) (Blackjack Apprenticeship):

• 11 vs. ace: hit under S17 instead of double.
• A,7 (soft 18) vs. 2: stand under S17 instead of double.
• A,8 (soft 19) vs. 6: stand under S17 instead of double.

Check the felt or the game info panel. It will say "dealer must draw to 16 and stand on all 17s" (S17) or "dealer hits soft 17" (H17). If you're unsure, the H17 chart costs you almost nothing at an S17 table.

How much does perfect play actually save you?

A lot, compared to guessing. Common playing mistakes alone can add roughly 0.83 percentage points to the edge on top of the baseline, and extreme misplay, like always standing, can push the edge as high as 15.7% (Wizard of Odds). Perfect basic strategy drags the edge down to roughly 0.5% in a good multi-deck game.

Rules move the number, though. Here's how the common variations stack up, playing the chart perfectly.

The single biggest trap is that 6:5 payout. It quietly triples your cost even with flawless play, so always check that a table pays 3:2. For a fuller breakdown of how each rule shifts the math, see Card Counting Explained, which builds on this foundation, and read up on bankroll management before you sit down. Ready to practise? You can try a hand at the blackjack tables once the chart feels automatic.

Playing responsibly

Basic strategy shrinks the house edge, but it never flips it. Over enough hands the casino still expects to win, so treat blackjack as entertainment with a cost, not a way to make money. Set a budget you're comfortable losing, and stop when you hit it. If gambling stops feeling fun, take a break and use the deposit limits, timeouts, and self-exclusion options in the responsible gambling tools.

You can try this yourself at American Blackjack Betsoft Gaming on Wild.io, or browse the full Wild.io blackjack category.

Sources

• Wizard of Odds — Blackjack Basics (retrieved July 2026)
• Wizard of Odds — 4-Deck Strategy (retrieved July 2026)
• Wizard of Odds — Basic Strategy (General) (retrieved July 2026)
• Blackjack Apprenticeship — Strategy Charts (retrieved July 2026)
• Blackjack Apprenticeship — Why the Differences in Basic Strategy (retrieved July 2026)
• Gambling Sites — Understanding the Soft 17 Rule (retrieved July 2026)
• Vegas Aces — History of the Blackjack Strategy Guide (retrieved July 2026)

Do I need a different chart for online blackjack?

Usually no. Most online blackjack uses the same 4-8 deck, hit-soft-17 rules this chart is built for. Always confirm the payout is 3:2 and check the soft-17 rule in the game info panel before you play.

Is it legal to use a basic strategy chart at the table?

Yes. Basic strategy is public math, not cheating, and many casinos even sell the cards in their gift shops. In a live casino you generally can't slow the game to consult a card, but online you can keep the chart open beside you.

Does memorising the chart guarantee I'll win?

No. It gives you the best possible odds, but blackjack still carries a small house edge even with perfect play. Basic strategy minimises your expected loss over time; it doesn't remove it or promise winning sessions.

How long does it take to learn basic strategy?

Most people memorise the core moves in a few hours and lock in the full chart over a week or two of practice. Start with the always-split and always-stand rules, then drill the hard totals, which come up most often.

What's the difference between this and card counting?

Basic strategy tells you the best play for each hand regardless of what's already been dealt. Card counting tracks which cards remain to adjust your bets and a few decisions, as covered in Card Counting Explained.