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Blackjack Basic Strategy Guide | When to Hit, Stand & Split

By PlayBrain Team·March 6, 2026·7 min read

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Blackjack is the only casino game where your decisions actually change your odds. Play perfectly using basic strategy and the house edge drops to under 0.5%. Play on gut feel and you're giving away 2–4%. This guide shows you exactly what to do in every situation.

The Object of Blackjack

Beat the dealer by getting a hand total closer to 21 than theirs — without going over ("busting"). Number cards are face value, face cards (J, Q, K) are 10, and Aces are 1 or 11 (whichever helps more).

Blackjack (an Ace + any 10-value card) beats a dealer's 21 and pays 3:2.

Start playing now — free blackjack vs dealer AI

Your Four Decisions

Hit

Take another card. Use when your total is low and the dealer is likely to have a strong hand.

Stand

Take no more cards. Use when busting is likely or when the dealer is likely to bust.

Double Down

Double your bet and take exactly one more card. Best used when you have 10 or 11 and the dealer is showing a weak card.

Split

When you have a pair, split them into two separate hands, each with a new bet. Some pairs are always good to split; others never.

Basic Strategy: The Complete Rules

Basic strategy is the mathematically optimal play for every hand combination. Memorise these rules and you play near-perfectly.

Hard Hands (no Ace, or Ace counting as 1)

Your Total	Dealer Shows	Action
8 or less	Any	Hit
9	3–6	Double Down
9	2, 7–Ace	Hit
10	2–9	Double Down
10	10, Ace	Hit
11	2–10	Double Down
11	Ace	Hit
12	4–6	Stand
12	2, 3, 7–Ace	Hit
13–16	2–6	Stand
13–16	7–Ace	Hit
17–21	Any	Stand

The key insight: When the dealer shows 4, 5, or 6, they have to hit and are statistically likely to bust. So stand on anything 12 or higher and let the dealer destroy themselves.

Soft Hands (Ace counting as 11)

A soft hand can't bust on one hit because the Ace drops from 11 to 1 if you'd go over 21.

Your Hand	Dealer Shows	Action
Soft 13–14 (A+2, A+3)	5–6	Double Down
Soft 13–14	Other	Hit
Soft 15–16 (A+4, A+5)	4–6	Double Down
Soft 15–16	Other	Hit
Soft 17 (A+6)	3–6	Double Down
Soft 17	Other	Hit
Soft 18 (A+7)	3–6	Double Down
Soft 18	2, 7, 8	Stand
Soft 18	9, 10, Ace	Hit
Soft 19–21	Any	Stand

Pairs (Split or Not?)

Pair	Action
Aces	Always split
8s	Always split
10s	Never split (20 is a great hand)
5s	Never split (treat as 10, double instead)
4s	Never split
2s, 3s	Split vs dealer 2–7; hit otherwise
6s	Split vs dealer 2–6; hit otherwise
7s	Split vs dealer 2–7; hit otherwise
9s	Split vs dealer 2–6, 8–9; stand vs 7, 10, Ace

Always split Aces and 8s — this is the most important pair rule. Two Aces split gives each hand a chance at 21. Two 8s (total: 16) is the worst hand in blackjack — splitting gives you two fresh starts.

Never split 10s — standing on 20 wins almost 70% of the time. Don't wreck a great hand.

The Dealer's Hidden Card

A crucial fact that shapes all strategy: the dealer must hit until reaching 17 or higher. When the dealer shows a weak upcard (4, 5, 6), there's a solid chance they'll bust trying to reach 17. This is why basic strategy tells you to stand on 12–16 when the dealer is showing those weak cards — let them bust.

When the dealer shows 7–Ace, assume the hole card is a 10 (there are more 10-value cards in the deck than any other). That means the dealer likely has 17–21 already, and you need to hit aggressively.

House Edge & Why It Matters

With perfect basic strategy, the house edge in standard blackjack is 0.4–0.5%. That means on average you lose less than 50 cents per $100 wagered. Without strategy, average players give up 2–3%.

Avoid these moves that dramatically increase the house edge:

Taking insurance — it's almost always a bad bet (house edge 6–7% on insurance alone)
Standing on soft 18 vs dealer's 9 or 10 — basic strategy says hit
Not doubling 11 vs dealer's 6 — you're leaving money on the table
Splitting 10s — never, ever split a 20

How to Read the Dealer's Upcard Fast

The fastest mental shortcut: categorize the dealer's upcard as weak (4, 5, 6), neutral (2, 3, 7, 8), or strong (9, 10, Ace).

Weak dealer: Play conservatively, stand early, let them bust
Strong dealer: Hit aggressively, you need to build a better hand
Neutral: Follow basic strategy precisely — the math matters most here

Practice for Free

The best way to internalize basic strategy is repetition. PlayBrain's free blackjack game lets you practice unlimited hands against a dealer AI that follows standard casino rules — hit on soft 16, stand on 17. No money, no risk, just building the muscle memory for every decision.

After 50–100 hands of checking a strategy chart, the decisions will feel automatic.

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Frequently Asked Questions about Blackjack Basic Strategy Guide | When to Hit, Stand & Split

What is basic blackjack strategy?

Basic blackjack strategy is the mathematically optimal decision for every hand combination. Key rules: always hit soft 17, always stand on hard 17+, always split Aces and 8s, never split 10s or 5s, double down on 11 versus dealer 2-10. Following basic strategy reduces the house edge to under 0.5%.

When should I hit versus stand in blackjack?

Always hit hard totals of 8 or less. Always stand on hard 17 or more. For totals 12-16, stand if the dealer shows 4, 5, or 6 since they are likely to bust, otherwise hit. This middle range is where most player mistakes and losses occur.

Can I practice blackjack strategy for free online?

Yes. PlayBrain has a free Blackjack game where you practice basic strategy with no real money, no time pressure, and no registration. Play unlimited hands to build muscle memory for hit, stand, double, and split decisions.