Blackjack strategy charts: how to read and apply them

What a chart is

When you play blackjack, you can see the cards in your own hand and one of the dealer’s cards face-up. That’s enough to gauge whether you have a shot at a natural blackjack, how big the risk of busting is, and whether you can build a hand stronger than the dealer’s. Experienced players read situations like these at a glance¹, but for a beginner it’s not so easy — and that’s where the basic strategy chart (blackjack strategy chart) comes in: a visual cheat-sheet that tells you how to act based on your cards and the dealer’s upcard.

Basic strategy is worked out mathematically: for every situation it picks the action with the best expected return over the long run. The house edge over a player who plays by guesswork runs about 2–4%, whereas basic strategy trims it to roughly 0.5% — a real bankroll saving. Just keep one thing in mind: different blackjack rules call for different charts. Every example in this article is for classic blackjack on 4–8 decks, where the dealer stands on soft 17², doubling after splits is allowed and late surrender is offered.

How to read it

A basic strategy chart is always a table. The rows stand for the player’s hand (shown either as a point total or as an exact card combination), and the columns stand for the dealer’s upcard. The cell where your hand’s row meets the dealer’s-card column gives you a ready-made recommendation: how to act in exactly that situation.

Important: first find your row by your hand, then trace across to the column for the dealer’s upcard. The answer is where they meet — and there’s no other “correct” play in that cell.

The key

Almost every entry in the cells is marked with one or two English letters. Some sources also colour-code them, but the palette differs everywhere, so it’s the letters you should rely on. Here’s what they mean:

• H — Hit: take another card;
• S — Stand: stop taking cards;
• D — Double Down: double your original bet and take exactly one card;
• P or Sp — Split: split one hand into two³, doubling your bet;
• R — Surrender: fold before the showdown and reclaim half your stake⁴.

Sometimes a single cell offers two actions at once. It reads as “do the first if the rules allow it, otherwise do the second”⁵.

A full cheat-sheet (blackjack cheat sheet) with every possible situation on it isn’t hard to find. But more often it’s split into three separate charts, by the type of the player’s hand:

• hard — no Ace at all, or an Ace counted as 1 point;
• soft — with an Ace counted as 11 points;
• pair — two matching cards in one hand.

For clarity we give basic strategy below as exactly those three tables. A reminder: all the data is for classic blackjack on 4–8 decks with the dealer standing on soft 17, doubling after splits and late surrender. A handy colour key for quick reference looks like this.

Hard hands

In a hard hand there’s either no Ace, or the Ace counts as one. So once you’ve built up a high total there’s almost no cushion — and your main concern here is not to bust. We break down card values on a separate page, card values.

Soft hands

A soft hand contains an Ace that is, for now, counted as 11 points. That gives you room to manoeuvre: you can leave the Ace at its top value when it pays to, and on a small total you can hit freely, since busting is impossible — the Ace will simply “shrink” to one if it has to.

If, while hitting, you’re forced to count the Ace as 1 to avoid busting, the hand turns hard — and from there you play by the hard-hands table in the previous section.

Pairs

When your hand holds two matching cards, you can split them into two hands⁶ — and then each can win with its own bet. But you shouldn’t split every pair; here’s the table for pairs.

Important: always split a pair of 8s and a pair of Aces. Unsplit they’re weak hands: 16 is the worst total in the game, and a soft 12 from two Aces can’t bust on the next card but rarely grows into anything strong. Split the 8s and each hand starts from 8 instead of a stuck 16; split the Aces and each hand starts from 11 — a ten-value card makes 21, though a 21 after a split is an ordinary 21 paid 1:1, not a blackjack.

S17 vs H17

When you lean on a chart, it’s vital to know exactly which rules the table runs under and which rules the calculations were built for. Beginners often trip over how the dealer plays 17: every dealer stands on a hard 17, but on a soft 17 (an Ace counted as 11) some tables make them stand (S17) and others make them hit (H17). S17 is better for the player: with a soft 17 the dealer simply stands, whereas under H17 they draw again and can improve to 18–21. That rule alone adds about 0.2% to the house edge.

Because of this the table changes in a few specific cells. These are the doubling changes:

• A+8 vs dealer 6 — Stand under S17, Double (if allowed) under H17;
• 11 vs dealer A — Hit under S17, Double (if allowed) under H17;
• A+7 vs dealer 2 — Stand under S17, Double (if allowed) under H17.

In all of these, when the table rules don’t let you double, act just as you would if the dealer stood on soft 17. Where late surrender is offered, H17 also adds three surrenders: hard 15, hard 17 and a pair of 8s against a dealer Ace.

Deck count

Blackjack is played with one, two, four, six or eight decks, and the difference shows up in several ways:

• with one or two decks, a specific card is more likely to appear (for instance, all the nines may already be in hands or the discard tray), whereas with 6–8 decks the next card could be absolutely anything;
• a natural blackjack is a little easier to make when there are fewer decks;
• if a player tracks the cards left in the deck, a smaller number of decks helps, but penetration matters more — how deep into the shoe the dealer goes before reshuffling. Shoes of six and eight decks are counted routinely.

That said, don’t overstate how much the deck count affects long-term RTP: a chart built for slightly different rules costs you only a few hundredths of a percent of RTP. And if you want to be as precise as possible and not leave a cent on the table, the site has charts for different blackjack rule variants.

How to memorise it

Strictly speaking, you don’t have to memorise the table: with a good grasp of the game’s maths, a seasoned player works out the probabilities on their own. But beginners find it easier to know the chart by heart, and to get there, stick to a few principles:

1. memorising isn’t required — casinos usually don’t ban you from keeping a chart on hand and glancing at it, since the edge stays with the house anyway, and in random-number-generator games no one can see you at all;
2. if you do want to know the table by heart, start with one chart and don’t move on to the next until you’ve nailed the previous one;
3. visualise the table — better yet, print it out so it’s always in front of you;
4. use a trainer or play the demo version of blackjack against a random number generator — steady, repeated play locks in the “correct” moves fastest of all.

Confident play by basic strategy can push RTP to 99.5% (in rare versions with ideal conditions, even up to 99.85%), whereas a player who plays by guesswork can count on only about 96–98%. For more on payouts and odds, see the separate page.

Text rules of thumb

Some basic-strategy advice fits into short but punchy phrases:

• always split a pair of 8s and a pair of Aces;
• never, ever split a pair of 5s or a pair of 10s;
• almost always double a hard 10–11 — only hit if the dealer’s upcard is at least as high in value as your hand;
• when you hold 12–16 and the dealer shows a strong card (even “just” a 7), hit; when the dealer’s card is weak, it’s smarter to stand;
• a dealer card in the 4–6 range often tempts them into a bust, which is an automatic loss — so the player is better off stopping in time than busting themselves.

A general grasp of how blackjack decisions are made lets you play well even before the table is committed to memory.

Can you trust the charts

The whole point of basic strategy is to lose as rarely as possible. By making only the plays with the best expected return, a player lifts RTP to 99.5%, and higher at some tables. But strategy doesn’t guarantee wins, and under no circumstances does it wipe out the casino’s long-term edge entirely: you can finish ahead today and tomorrow, but not over daily play across weeks and months. It’s still worth using: without strategy you’d hand over 2–4% of your turnover, while with it you can effectively stretch even a small bankroll.

Footnotes

1. For example, you hold 11 points with no Ace: busting on a single card is impossible here (an Ace drawn counts as 1), while any ten, Jack, Queen or King gives you 21 (not a blackjack — that’s only a two-card 21). Your chances are good — which is why it’s sensible not just to take a card, but to double your bet. ↩

2. A hand worth 17 points in which the Ace is valued at 11. ↩

3. In every version of blackjack, a split is only possible if the player has two matching cards in one hand. ↩

4. This move isn’t allowed in every blackjack variant; and different versions cap the moment at which it’s still not too late to rescue half your stake in different ways. ↩

5. For example, the main recommendation is Surrender, and the second option is used at tables where surrender isn’t offered. ↩

6. Many rule variants also allow a re-split, sometimes up to four hands in total. ↩