Blackjack is a game of chance where the player tries to accumulate as close to 21 as possible, by rolling two equal dice and counting the number shown. The player subtracts the total of the two dice from 21 and if the result is less than 10, the player bets (puts) money into the pot.
If the result is 11 or more, then the player stands (does not bet).
The odds of Blackjack are determined by how many decks of cards are used in the game. A standard deck has 52 cards, including 2 jacks, 2 queens, 2 kings, and 2 twos. In a casino setting with only one deck of cards, there are 18 blackjacks (1 through 10), 12 red jacks (A through 10), and 32 other cards. This means that for every 100 hands of Blackjack, there will be 18 blackjacks and about 1 in 3 hands will have at least one blackjack.
For two decks of cards, there are 36 blackjacks (1 through 10), 18 red jacks (A through 10), and 48 other cards. For three decks of cards, there are 54 blackjacks (1 through 10), 24 red jacks (A through 10), and 72 other cards. So for every 100 hands of Blackjack using two decks or more, about 1 in 3 hands will have at least one blackjack but for every 100 hands using one deck or less, about 1 in 4 hands will have at least one blackjack.
What this means is that the house advantage in Blackjack is about 0.7%.
This means that for every $100 wagered by a player, the house will earn $70 after deducting dealer fees and expenses.
