21 + 3 Blackjack Side Bet: How Does it Work?

Gambling at casinos is a popular pastime for millions of people worldwide. With the advent of the first online casinos, internet gambling has exploded in popularity.

The options for casino games are wide open, and new variations of existing games are constantly being introduced. When it comes to thrilling and enjoyable blackjack variations, look no further than 21+3, a side bet played alongside the standard game. Our post explains the 21 3 blackjack rules so you understand what it's about.

What is 21+3 in Blackjack?

What is 21+3 in Blackjack?

“What is 21 3 in Blackjack?” one may ask. Blackjack side bet 21 3 involves two forms of gameplay. These include the standard blackjack game and a small three-card poker game. Participants make use of two of their original cards and a dealer’s 1-up card to make a ranking three-card poker hand. If their luck shines, they stand a chance to win a large amount of cash.

21 + 3 Blackjack Side Bet Variations

21 + 3 Blackjack Side Bet Variations

There are a number of different 21 3 blackjack games you can play depending on the casino. The regular variant has a payout ratio of 9 to 1 for each winning hand.

You should know that a straight flush will pay the same as a 3-of-a-kind because rank is ignored. Look for a blackjack 21+3 extreme variant if you want a game with a sliding pay scale based on the hand.

Standard blackjack 21+3 games have a house edge of about 13.99%. It's important to note that different casinos have different house edges.

The range of possible changes is from 1.60% to 33.44%. In addition, there are numerous avenues to victory in the standard 21 3 blackjack game.

21 + 3 Blackjack Side Bet

Making 21 + 3 Blackjack Side Bet

Usually, you have two choices before the cards are dealt to you. The first step is to choose how much you want to wager in blackjack.

You'll need to make this bet if you wish to play three-card poker. When the ante has been met, you can make your three-card poker wager.

The side bet is placed before each hand of blackjack is dealt. As soon as a player receives 2 cards, the dealer will place a 1-up card on the table.

You win the side bet if your hand contains a straight flush, straight, or flush, or if you have three of a kind. The blackjack game resumes as usual after the payment has been made.

How Does 21+3 Work in Blackjack?

How Does 21+3 Work in Blackjack?

You'll need to grasp the meanings of some of the game's terms if you want to have a sense of 21+3. All you need to know about blackjack 21+3 odds can be found below:

  • Flush: Three cards in a row, all of the same suit, is called a flush. A Flush in a game using the standard number of decks pays 5, has a chance of 0.058424, and has a return to player of 0.292118. With the Flush and all other factors held constant, the RTP and probability for an 8-deck game are 0.058841 and 0.294207

  • Straight: A straight occurs when your first 3 cards (your 2 cards and the dealer's up card) form a straight sequence. Take the numbers 5-6-7 as an example.

    There are 155,520 possible straights, and the odds of getting one are 31:969. “Straight” blackjack 21 3 payouts are 10 to 1.

  • 3 of a kind: The term "3 of a kind" refers to a hand containing three identical cards or three face cards. In version 7, 3-of-a-kind occur whenever you have 3 cards of the same suit.

    If you play a game with a live dealer, you can win up to 100 times your initial bet. The payout for a 3-of-a-kind is 20 to 1, and the odds are 1:199 while playing 21+3 extreme. There are 6,312 possible combinations.

  • Straight flush: A straight flush operates in the same manner as a “Flush.” That is, having two cards dealt and 1-up live dealer card in a sequence. However, the only difference between a “Straight flush” and a “Flush” is that all the cards must be in the same suit.

    There are about 10,368 combinations in a “Straight flush,” and the odds of winning are 1:499. You can expect a payout of 30 to 1 when you hit a straight flush

21+3 Blackjack with Top 3

You may play 21 + 3 blackjacks with the top 3 bets at some online casinos. These bets are most common in 21 + 3 blackjack games that use 4, 6, or 8-deck shoe. Players must make both the blackjack bet and the 21 + 3 poker bet for the top 3 bet to take place.

21 + 3 blackjack with top 3 bets follows the 3-card hand rule. Under this regulation, a player's three-card poker hand must consist of their original two cards plus the dealer's up card. The paytable specifies the amounts given for certain poker hands, such as straight flushes, three-of-a-kind suited, and three-of-a-kind.

Find below the odds for this game:

  • The odds for 3 of a kind suited is 270 to 1
  • A straight flush odds is 180 to 1
  • 3 of a kind gives 90 to 1


The blackjack 21 3 strategy isn’t much different from standard Three Card Poker and blackjack play. It is, as always, difficult to predict which card might show up in the side bet as the deck is being shuffled. One way to increase your chances of winning is to take advantage of a casino's bonuses.

Once you can grasp what 21 3 means in blackjack, you'll have no trouble understanding the game. The only catch is that it's possible that not all casinos will feature this game. You might have to put in more effort to find the game.

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