How to Play Blackjack: Rules and Basic Strategy

The game in one paragraph

Blackjack is the rare casino game where your decisions change the odds. The goal is simple: build a hand closer to 21 than the dealer’s without going over. You get choices, hit, stand, double, split, while the dealer must follow fixed rules. Play your cards well and the house edge shrinks to roughly half a percent, which is why blackjack has the most studied strategy of any table game. Play by feel and you hand several times that edge back.

Card values and hand totals

The arithmetic is worth thirty seconds of attention, because every decision flows from it:

Number cards count at face value: a 7 is seven.
Face cards, jack, queen, king, count as 10.
Aces count as 1 or 11, whichever helps you more.

A hand that contains an ace counted as 11 is called soft (soft 17, soft 18), because if you draw a big card the ace can drop to 1 and the hand survives. A hand with no ace counting as 11, including a hand that contains an ace now counted as 1: is hard. That distinction matters on the strategy chart: soft hands can’t bust with one more card, hard hands can.

How a hand plays out

The deal. You place a bet; you and the dealer each get two cards. One of the dealer’s cards is face up, the upcard, and everything you decide is based on it. In US games the dealer checks for blackjack when the upcard is an ace or a ten.
Blackjack. An ace plus a ten-value card on the first two cards is a blackjack. It beats every other 21 and pays 3:2 at good tables, a $10 bet collects $15. If the dealer also has blackjack, the hand is a push and your bet comes back.
Your turn. Hit (take another card) or stand (keep what you have). Bust by going over 21 and you lose immediately, no matter what the dealer does next.
The dealer’s turn. The dealer reveals the hole card and draws by fixed rules. In most US games the dealer stands on all 17s, including soft 17. Some games instead make the dealer hit soft 17, which is slightly worse for you (about two-tenths of a percentage point on the house edge).
The payout. Beat the dealer and you’re paid even money. Push (tie) and your stake returns. Lose and the bet is gone.

One payout warning before anything else: some tables pay blackjack at 6:5 instead of 3:2. That single rule change adds roughly 1.4 percentage points to the house edge: a $10 blackjack pays $12 instead of $15, and it compounds over every session. When you have a choice, play 3:2.

Doubling, splitting and insurance

Double down: one card, double the bet

Doubling means you add a second bet of the same size and receive exactly one more card, then stand. It’s the move that lets you press an advantage: doubling 11 against a dealer’s 5 or 6 is one of the best bets on the table. Most US games allow doubling on any two cards, and many allow it after a split (a rule called double after split, or DAS). You’ll use it most often on 10 and 11.

Splits: turn one hand into two

When your first two cards are a pair, you can split them into two separate hands, each with its own bet, usually up to four hands in total. The rules worth knowing:

Always split aces and eights. Aces give you two shots at 21; a pair of eights is a hard 16, the worst hand in the game.
Never split tens. A pair of tens is a 20: one of the strongest hands you can hold, and splitting turns it into two hands that win far less often.
Never split fives. A pair of fives is a hard 10, which you should double.
Split aces usually receive one card each, and a 21 formed after a split counts as a plain 21, not a blackjack: it pays even money.

Insurance: decline it

When the dealer’s upcard is an ace, you’ll be offered insurance: a side bet costing half your original wager that pays 2:1 if the dealer has blackjack. It sounds like protection; it’s a bet with a house edge of roughly 7 percent in a six-deck game, because the dealer fails to have blackjack far more often than the payout implies. Basic strategy players decline insurance every time. (Card counters treat it as a signal, not a bet, but that’s a different discipline.)

Basic strategy: the plays that matter

Basic strategy is the optimal play for every combination of your hand and the dealer’s upcard: you don’t need to memorize every cell, the chart covers the plays that decide most hands. It assumes the most common US setup: six decks, dealer stands on soft 17, double after split allowed.

Legend: H = hit · S = stand · D = double if allowed, otherwise hit · P = split.

Basic strategy: six decks, dealer stands on soft 17, double after split allowed
Your hand	2	3	4	5	6	7	8	9	10	A
Hard totals
5–8	H	H	H	H	H	H	H	H	H	H
9	H	D	D	D	D	H	H	H	H	H
10	D	D	D	D	D	D	D	D	D	H
11	D	D	D	D	D	D	D	D	D	H
12	H	H	S	S	S	H	H	H	H	H
13–16	S	S	S	S	S	H	H	H	H	H
17+	S	S	S	S	S	S	S	S	S	S
Soft totals
A,2–A,3	H	H	H	D	D	H	H	H	H	H
A,4–A,5	H	H	D	D	D	H	H	H	H	H
A,6	H	D	D	D	D	H	H	H	H	H
A,7	S	S	D	D	D	S	S	H	H	H
A,8–A,9	S	S	S	S	S	S	S	S	S	S
Pairs
A,A	P	P	P	P	P	P	P	P	P	P
2,2 and 3,3	P	P	P	P	P	P	H	H	H	H
4,4	H	H	H	P	P	H	H	H	H	H
5,5	D	D	D	D	D	D	D	D	D	H
6,6	P	P	P	P	P	H	H	H	H	H
7,7	P	P	P	P	P	P	H	H	H	H
8,8	P	P	P	P	P	P	P	P	P	P
9,9	P	P	P	P	P	S	P	P	S	S
10,10	S	S	S	S	S	S	S	S	S	S

A handful of cells shift in games where the dealer hits soft 17, most famously 11 against an ace, which becomes a double, but everything else above holds across the common multi-deck games.

What the chart is worth

With basic strategy, a good six-deck game, 3:2 blackjack, dealer stands on soft 17, double after split, carries a house edge of roughly 0.5 percent. That is dramatically better than the same game played by instinct: players who ignore the chart commonly surrender two percent or more, which over a session is the difference between entertainment and a toll. The glossary entry on house edge explains how that number works.

Two things basic strategy is not. It is not a winning system, the edge still points at the house, just far less sharply. And it is not a personality test: the chart is indifferent to hunches, streaks, and how the table feels. Follow it and you lose less; that’s the entire promise, and it’s a real one.

Bankroll and table sense

The rules decide the odds; your staking decides how long you last. A few habits do most of the work:

Set a session bankroll before you sit down, money you can lose without it mattering, and keep each bet around 1 to 2 percent of your total bankroll. The bankroll management entry covers the reasoning.
Bring enough units. A working rule of thumb is 20 to 40 betting units for a session, 20 to 40 times your base bet: at a $10 table, that’s $200 to $400. A short stack turns normal variance into an early exit.
Skip the escalation systems. Doubling your bet after every loss (and its cousins) collides with table limits and variance. No staking pattern changes the house edge.
Use the clock, not just the wallet. Set a loss limit and a win limit, and take breaks. Online rounds run several times faster than live ones, so the same edge costs more per hour: pace is part of the math.

Live dealer vs digital blackjack

Digital blackjack is powered by a random number generator: rounds start the moment you click, you can often play several hands at once, minimums are low, and the rules card is fixed and visible. Live dealer blackjack streams a real table with a real dealer, slower (a live table deals far fewer hands an hour, versus several hundred online), usually higher minimums, but with the texture and pace of a casino floor. The live dealer entry covers the format in more detail.

The odds are set by the rules, not the format, so compare what each table actually offers, decks, soft-17 rule, blackjack payout, and check the operator’s tables via our casino reviews before you commit. If you want volume and low limits, digital wins. If you want the table experience and don’t mind the pace, live is worth the higher minimum.

The short version

Learn the two rules of thumb that cover most hands, stand on hard 17 or more, and stand on 12 to 16 against a dealer’s 2 through 6, then the three that cover the rest: split aces and eights, never split tens, decline insurance. Prefer 3:2 tables where the dealer stands on soft 17, size your bets to your bankroll, and let the chart make the decisions. Blackjack rewards preparation more than any other game on the floor, and the preparation is a one-page chart.