If you have ever sat at a blackjack table and guessed whether to hit or stand, this guide is for you. Blackjack is one of the only casino games where your decisions change the odds, and basic strategy is the complete set of correct decisions — worked out mathematically, not by instinct or folklore.

Learning it takes about two weeks. It cuts the house edge from roughly 2% to about 0.5%, the lowest of any table game.

• Basic strategy is the mathematically optimal play for every hand against every dealer upcard.

• Following it reduces the house edge from roughly 2% (guessing) to about 0.5%.

• Around 20 core rules cover most situations; the rest is pattern recognition.

• Never take insurance. Never split tens. Always split aces and eights.

• The dealer's upcard matters as much as your own hand.

Before You Start

Blackjack pits your hand against the dealer's. You win by finishing closer to 21 without busting, or when the dealer busts. Cards 2–10 count face value, face cards count 10, and aces count 1 or 11.

Table rules change the chart, so check them before you sit. Four variables matter:

• Number of decks. Single-deck charts differ from multi-deck ones in several plays.

• Soft 17. Whether the dealer hits or stands on soft 17 (H17 or S17).

• Double after split. Whether DAS is permitted.

• Surrender. Whether late surrender is offered.

This guide covers six or eight decks, dealer hits soft 17 (H17), double after split allowed — the most common configuration in modern casinos. Where H17 changes a play from the more familiar S17 chart, it is flagged below.

The Chart

Hard Totals

A hard hand has no ace, or has an ace that must count as 1.

H = hit · S = stand · D = double if allowed, otherwise hit

Soft Totals

A soft hand counts an ace as 11, so the next card cannot bust you.

Where doubling is not allowed, stand on totals of 18 or more and hit on 17 or less.

Pairs

Sp = split. A pair of fives is never split — play it as a hard 10.

Surrender

Where late surrender is offered under H17 rules:

• Surrender hard 16 against 9, 10 or ace

• Surrender hard 15 against 10 or ace

• Surrender hard 17 against an ace

If surrender is unavailable, follow the hard totals chart instead.

How to Learn It

Hard hands first

This is the largest block and the one you will use most. Three rules carry most of it:

• Hit anything 8 or below.

• Stand on 17 or above.

• For 12 through 16, stand against a dealer 2–6 and hit against 7 or higher.

The one exception inside that band is hard 12, which hits against a 2 or 3.

Dealer upcards 2 through 6 are called bust cards because the dealer busts most often showing them — roughly 35% on a 2, rising to about 42% on a 5. That spread is why you stand on a weak 14 against a 5 and hit the same hand against a 10. You are not betting on your hand improving; you are betting on the dealer breaking.

Soft hands

The doubling ranges step outward as your total climbs:

• A,2 and A,3 double against 5–6

• A,4 and A,5 double against 4–6

• A,6 doubles against 3–6

• A,7 doubles against 2–6

• A,8 stands everywhere except against a 6, where H17 rules make doubling correct

Soft 18 is the most misplayed hand in blackjack. Beginners stand on it against everything. The chart doubles it against 2–6, stands against 7 and 8, and hits against 9, 10 or ace — standing on soft 18 against a 10 loses more often than hitting.

Pairs

Always split aces and eights. Never split tens or fives. Split 2s, 3s and 7s against 2–7; 6s against 2–6; 4s only against 5–6. Nines are the awkward one: split against 2–6 and 8–9, stand against 7, 10 and ace.

Aces and eights are where most of the splitting value sits. Splitting aces gives you two hands starting at 11, the best opening total in the game. Splitting eights turns 16 — the worst total in the game — into two fresh chances.

Doubling

Doubling matches your bet for exactly one more card, which makes it the most profitable move available when the odds justify it. Double hard 9 against 3–6, hard 10 against 2–9, and hard 11 against everything under H17 rules. Never double hard 12 or above.

If you remember one doubling rule, make it hard 11. It is the most profitable single decision on the chart, and skipping it is the most expensive habit a casual player has.

Drilling

Reading a chart is easy. Recalling it in three seconds with a dealer waiting is not. Fifteen minutes a day for two weeks gets most people there.

Start with hard hands, add soft hands, then pairs. Cover the chart, call the play, then check. Aim for 95% accuracy before you consider yourself ready.

Worked Example: Hard 16 vs Dealer 10

This is the most argued-over hand in blackjack, and it is worth understanding properly.

You hold a 10 and a 6 against a dealer 10. Most beginners stand and hope. The chart says hit — but the honest answer is that it is extremely close.

Standing, you win only when the dealer busts, which a 10 upcard does roughly 21% of the time. You cannot push, because 16 loses to every dealer total of 17 or more.

Hitting, you win slightly more often — around 23% — because you can now make 17 through 21 and beat or tie the dealer. You also bust more.

Both plays lose money. The expected loss is around 54% of your bet either way, and hitting is better by a fraction of a percent. It is the narrowest decision on the entire chart, which is exactly why it feels wrong: your instinct is not detecting a mistake, it is detecting a near-coin-flip.

Now the same 16 against a dealer 5. You stand, because the dealer busts around 42% of the time showing a 5. Standing wins roughly 42% against a 5 versus roughly 21% against a 10 — double the win rate, from an identical hand.

That is the central lesson of the chart. The dealer's card, not yours, drives the decision.

What it adds up to. Over a 500-hand session at $10 a hand, that is $5,000 of action. At basic strategy's 0.5% edge you expect to lose about $25. Guessing your way through at roughly 2% costs about $100. Same session, same cards, $75 of difference from one chart.

Adjusting for Table Rules

Number of decks. Single-deck charts differ in several places, particularly around doubling and splitting. Six and eight decks use the chart above.

Dealer soft 17. Under S17, three plays change: soft 18 stands against a 2 rather than doubling, soft 19 never doubles, and hard 11 hits against an ace. The chart above is H17.

Double after split. Without DAS, tighten the splits — 2s, 3s, 4s and 6s split against fewer upcards.

Surrender. Where offered, the surrender rules save more than any other single adjustment available to you.

Payouts. Always prefer tables paying 3:2 on blackjack. A 6:5 payout adds roughly 1.4% to the house edge, which wipes out nearly everything basic strategy gains. This is the single most important number on the felt, and it is easy to miss.

Why It Works

Basic strategy is not opinion. It is the output of exhaustive computation — begun by hand and early computer in the 1950s and 60s, refined continuously since — testing every possible hand against every dealer upcard to find the play with the highest expected value.

Expected value is the average return per unit wagered. Every cell in the chart is the play with the best EV for that exact situation. When the chart says double hard 11 against a 6, it is because doubling returns roughly twice what hitting does over the long run, and that gap is what you collect by following it.

Played perfectly on a standard six-deck game, the house edge lands around 0.5%: about 50 cents lost per $100 wagered over the long run. For comparison, single-zero roulette runs 2.70%, double-zero roulette 5.26%, and slots typically carry a 3–6% edge depending on the title.

A note on card counting. You will see it mentioned alongside basic strategy, but it does not apply to online play. RNG-dealt games reshuffle a full virtual shoe every hand, and most streamed live tables use continuous shufflers. Counting requires a shoe that depletes, and these do not. Online, basic strategy is the whole of what is available — and it is enough to make blackjack the best-value game on the floor.

Common Mistakes

Standing on 16 against a 10. Hitting is marginally better, though the margin is genuinely tiny. Do not agonise over this one.

Taking insurance. It is a side bet on the dealer holding blackjack, and on a six-deck game it carries a house edge of roughly 7%. Decline it every time, including when you hold a blackjack yourself.

Splitting tens. A pair of tens is a 20, the second-best hand in the game. Splitting turns one very strong hand into two ordinary ones.

Standing on soft 18 against a 9, 10 or ace. Soft 18 looks stronger than it is. Against a strong upcard, hit.

Ignoring the dealer's upcard. Half the chart is the dealer's card. Beginners read their own total and stop there, which is why the same 16 gets played identically against a 5 and a 10.

FAQ

What is basic strategy?

The mathematically optimal play for every hand against every dealer upcard, derived by simulating the full space of possible situations. Following it takes the house edge to roughly 0.5% on a standard table.

Do I need to memorise the whole chart?

No. Around 20 rules cover most hands you will actually see. Learn hard totals first, then soft hands, then pairs.

Does basic strategy work in online blackjack?

Yes. It applies to any game with standard rules, live-dealt or RNG-dealt. The only adjustments are for rule variations — deck count, soft 17, DAS, surrender and payout.

Can I win money with basic strategy?

It reduces the house edge but does not remove it, so over the long run you still expect to lose slightly. Short sessions can end well or badly. Treat it as getting better value from entertainment, not as an income method.

What is the single most important rule?

Always split aces and eights, and never split tens. Add "always double hard 11" and you have captured a large share of the chart's total value.

How long does it take to learn?

Most people have the core rules in two weeks at fifteen minutes a day. Full fluency including edge cases takes a month or so.

Is the chart the same for single-deck games?

No. Single-deck charts differ in several plays. Always check the deck count before applying a chart.

Why is blackjack's house edge so much lower than slots?

Because your decisions affect the outcome. A slot resolves entirely on the random number generator with no decision to make, so its edge is fixed by the paytable. In blackjack, roughly 1.5% of edge sits in your hands — and basic strategy is how you claim it.

The Short Version

Learn the hard totals first. Remember that 12 through 16 stand against 2–6 and hit against 7 or higher. Always split aces and eights, never split tens, always double hard 11, and never take insurance. That much alone puts you ahead of most casual players at the table.

Then fill in the soft hands and the remaining pairs, and you are playing the game as well as it can be played without counting cards.

Blackjack is a game of chance with a built-in house edge. Basic strategy improves your expected return; it does not make the game profitable. Set a limit before you play and stop when you reach it. If gambling stops feeling optional, support is available through national helplines and self-exclusion schemes.

Note on Corrections

The version I received contained four incorrect strategy plays, all in the soft hands section, which I have corrected in the chart above:

The last two were S17 plays in a guide that states it covers H17. Hard totals and pair splitting were all correct in the original.

Two other fixes: the worked example had its win percentages reversed (it said standing wins 23% and hitting 21%, then concluded you should hit), and it described the edge as worth "$2 per $10 bet" when 16 vs 10 is the closest decision on the chart. The insurance house edge was given as 5.9%, which is the single-deck figure — six-deck is roughly 7%.

I also added the actual charts, since the article was titled after a chart it did not contain.