Blackjack – also called twenty-one – is one of the most popular card games in any casino. The core idea fits in one sentence: get closer to 21 than the dealer without going over. Go over 21 and you "bust" and lose immediately. What makes the blackjack rules so interesting is everything around that: split, double, surrender, the blackjack payout and the dealer's rules all move the house edge by several percent.
This handbook walks you through all the blackjack rules you actually use at the table: card values, the flow of a round, player options, rule details and the main variations. By the end you will know not just how the game is played, but which tables are fair – and which to avoid.
Card values
- 2 through 10 count their printed value.
- Jack, Queen, King count as 10.
- Ace counts as 1 or 11 – whichever helps you.
A hand with an ace counted as 11 is called "soft" (Ace+6 = soft 17). Once the ace must count as 1 to avoid busting, the hand becomes "hard". These blackjack rules for the ace are what make soft hands so flexible.
How a round of blackjack is played
- Bet. You place your wager in the betting circle.
- Deal. The dealer gives each player two face-up cards and takes one up-card and (in US rules) one face-down hole card.
- Blackjack check. If the dealer shows an ace or ten, they check for blackjack.
- Player decisions. In turn, each player acts: hit, stand, double, split, surrender.
- Dealer's turn. The dealer reveals the hole card and draws by fixed rules.
- Payout. Closest to 21 wins. A tie is a "push". A natural blackjack pays 3:2 at a fair table.
A natural blackjack (ace + ten as the first two cards) only counts with the first two cards. Reaching 21 with three or more cards wins the hand but pays 1:1 – an important detail in the game rules.
Player options: what you can do
Hit
Draw another card. You may keep drawing until you are happy or bust. Busting loses immediately, even if the dealer later busts too – the structural edge of the casino.
Stand
Take no more cards; play passes on.
Double down
Double your bet and take exactly one card. Strong on hard 10 or 11 against low dealer cards. "DAS" (double after split) means you may also double after splitting – a player-friendly rule.
Split
With two cards of the same value you may split into two hands with a second equal bet. Table limits on re-splitting and splitting aces vary. Always split aces and eights; never split tens or fives.
Surrender
Give up the hand and get half your bet back. Usually "late surrender" after the dealer's blackjack check. Useful mainly on hard 16 vs dealer 9/10/A.
Insurance
If the dealer shows an ace, they offer insurance. Mathematically it is almost always a losing bet – do not take it.
The dealer's rules
The dealer has no choice and follows fixed game rules:
- 16 or less: must hit.
- Hard 17 or more: must stand.
- Soft 17: either stand (S17) or hit (H17), depending on the table. S17 is about 0.2% better for you.
Blackjack payout: 3:2 vs 6:5
A natural blackjack should pay 3:2. Many casinos now offer 6:5, which costs you about 1.4% extra house edge – often more than perfect strategy saves. Rule of thumb: a 6:5 table is not worth playing. Leave and find 3:2.
Rule details that change the house edge
Small blackjack rules add up. Approximate effects:
- Blackjack 3:2 vs 6:5 – about +1.39% against the player at 6:5.
- S17 vs H17 – S17 about −0.20% (better for you).
- Deck count – single deck about −0.48% vs eight decks.
- DAS – about −0.14%.
- Late surrender – about −0.07%.
- European no-hole-card (ENHC) – about +0.11% against the player.
For your exact combination, the house edge calculator gives the precise number.
Blackjack variations
- Single deck blackjack – lowest edge at a fair 3:2 payout; composition-based strategy.
- Double deck – about 0.19% edge with good rules.
- 6/8 decks – the casino and online standard.
- European blackjack (ENHC) – no hole card; changes double/split play against 10/ace.
Table etiquette and table limits
At a real table, hand signals are binding: tap for hit, wave for stand. Do not touch the cards in a face-up shoe game, place chips on the felt rather than in the dealer's hand, and keep your phone away. Check the table limits sign before sitting: minimum and maximum bet, plus whether the game rules say S17, 3:2, DAS and surrender. Blackjack is not poker – there is no bluffing – but the same courtesy applies: play at a steady pace and avoid slowing the game.
Playing blackjack in a casino vs online
Playing blackjack in a land casino and playing the same game online share identical rules; only the presentation differs. In a casino the game moves at the dealer's pace and the table limits are posted on a placard. Online, the game rules sit in the lobby and the game runs faster. Unlike poker, blackjack is not a game you play against other people – in poker you read opponents, in blackjack you play the game against a fixed dealer rule. That single difference from poker is why the casino game of blackjack has a solvable optimal strategy and poker does not. Pick the casino game and the format that fits you; the underlying game math is the same, and every casino uses it.
Ultimately, whether you win or lose at this card game comes down to the rules and your play. You win some hands and lose others; over a session you win more when the rules are fair. To win consistently you need good rules, and to win at all you must avoid the sucker bets. A win at this card game is never guaranteed, but fair rules give every win its proper value.
Blackjack rules FAQ
What is the difference between blackjack and 21? Colloquially the same. A "natural blackjack" is ace + ten in the first two cards and pays 3:2; any other 21 pays 1:1.
Who wins on a tie? Nobody – a push, and your bet is returned.
Can I touch my cards? In a multi-deck shoe game, no. In some single-deck games, yes, with one hand.
What if we both have blackjack? Push – your bet comes back.
After the rules comes strategy
Once the blackjack rules click, the next step is basic strategy – the chart that tells you the best move for every hand. The full picture is in the blackjack strategy guide, and you can practice in the trainer.
Generate the exact blackjack strategy chart for your rules →