Blackjack (21) Online

The classic casino card game! Test your skills against the dealer. Get as close to 21 as possible without going over.

How to Play: You are dealt two cards face up. The dealer gets one card face up and one face down. You can "Hit" to get another card or "Stand" to keep your current hand. If your hand exceeds 21, you "Bust" and lose immediately.

Single Deck
Multi-Deck (6)
Tournament Style
1000
Balance
50
Current Bet
0
Wins
0
Losses
Dealer
Score: 0
Player
Score: 0
Cards remaining: 52
$1
$5
$10
$25
$100
Current Bet
$50

Dealer shows an Ace. Would you like insurance?

You Win!

You beat the dealer with a score of 20!

Payout: $100

Game History

Recent Games

About Blackjack (21)

Blackjack, also known as twenty-one, is the most widely played casino banking game in the world. It is a comparing card game between a player and dealer, meaning players compete against the dealer but not against other players.

Historical Significance: Blackjack's origins are debated, but it is believed to have originated from French casinos in the 1700s. The game was called "Vingt-et-Un" (French for "twenty-one"). It became popular in the United States in the 19th century, where casinos offered bonus payouts to attract players.

Blackjack Basic Strategy

Basic strategy is a mathematically optimal way to play blackjack.

Key principles:

1. Always stand on hard 17 or higher

2. Always hit on hard 11 or lower

3. Double down on 11 against dealer 2-10

4. Split Aces and 8s, never split 10s or 5s

5. Stand on hard 12-16 when dealer shows 2-6

6. Hit on hard 12-16 when dealer shows 7-Ace

Following basic strategy reduces the house edge to as low as 0.5% in a typical game, making blackjack one of the most favorable casino games for skilled players.

Blackjack Odds & Probabilities

Player Hand Dealer Up Card Correct Play House Edge Win Probability
Hard 16 7 Hit 0.43% 23.5%
Hard 15 10 Hit 0.54% 22.1%
Hard 11 6 Double Down 0.18% 71.2%
Soft 18 (A,7) 2 Double Down 0.23% 69.8%
Pair of 8s 10 Split 0.38% 47.2%
Pair of Aces 5 Split 0.19% 64.7%
Hard 12 3 Stand 0.31% 37.5%

Blackjack Variations

Classic Blackjack: The standard game with the dealer standing on soft 17, blackjack pays 3:2, and players can double down on any two cards.

1

European Blackjack: The dealer receives only one card initially and takes a second card after players complete their hands. No hole card means no dealer blackjack until after players act.

2

Spanish 21: Played with a Spanish deck (48 cards, no 10s). Player blackjack always wins, players can double down on any number of cards, and there are bonus payouts for certain hands.

3

Blackjack Switch: Players play two hands and can switch the top cards between hands. Blackjack pays even money, and dealer pushes on 22.

Frequently Asked Questions

The house edge in blackjack varies based on the rules and the player's strategy. With perfect basic strategy, the house edge can be as low as 0.5% in favorable games. Common rule variations like dealer hitting on soft 17, fewer decks, and 3:2 blackjack payouts reduce the house edge, while 6:5 blackjack payouts significantly increase it to around 1.4%.

No, basic strategy players should never take insurance. Insurance is a side bet that pays 2:1 if the dealer has blackjack. Statistically, the dealer will have a ten-value card in the hole about 31% of the time when showing an Ace, making insurance a bad bet with a house edge of approximately 5.8% to 7.4% depending on the number of decks.

Always split Aces and 8s. Never split 10s, 5s, or 4s. Split 2s, 3s, and 7s when the dealer shows 2-7. Split 6s when the dealer shows 2-6. Split 9s when the dealer shows 2-6 or 8-9 (but not against 7, 10, or Ace). These plays are based on mathematical probability and give you the best chance to maximize your winnings.

Card counting is a strategy used to track the ratio of high cards to low cards remaining in the deck. When the deck is rich in high cards (10s and Aces), players have a statistical advantage because blackjacks are more likely, and the dealer is more likely to bust when hitting on stiff hands (12-16). The most common counting system is the Hi-Lo method, which assigns +1 to low cards (2-6), 0 to neutral cards (7-9), and -1 to high cards (10-Ace).

A soft hand contains an Ace that can be counted as either 1 or 11 without busting. For example, Ace-6 is a soft 17 (can be counted as 7 or 17). A hard hand either contains no Ace or contains an Ace that can only be counted as 1 without busting. Soft hands are advantageous because they give you more flexibility - you can hit without fear of busting since the Ace can revert from 11 to 1 if needed.