casino days
CasinoLive CasinoCrash

21+3 Blackjack Side Bet Guide

The 21+3 blackjack side bet is a popular bet that combines elements of poker with traditional blackjack. This bet is based on the player’s two initial cards and the dealer’s upcard, forming a three-card poker hand. Winning combinations include flush, straight, three of a kind, straight flush, and suited three of a kind, with payouts increasing based on hand rarity. The 21+3 bet adds excitement and bigger payout potential, but it comes with a higher house edge compared to standard blackjack. While fun for casual play, it’s important to understand the odds before placing this bet regularly.

What is the Blackjack 21+3 Side Bet?

The 21+3 side bet is one of the most popular side bets for blackjack, using the player’s first two cards and the dealer’s upcard to form a three-card poker hand. Payouts vary depending on the hand, with suited three of a kind typically offering the highest reward. It’s an exciting side bet to play; however, it carries a high house edge, which means the risk is higher.

21+3 Side Bet Rules and Payout

Here are the basic rules and the payouts at Casino Days for the 21+3 side bet in blackjack:

1. Optional bet: The 21+3 bet is placed alongside your main blackjack bet, before any cards are dealt;

2. Card combination: The bet is based on the player’s first two cards and the dealer’s upcard;

3. Poker hands: These cards are evaluated as a poker-style hand. If they form one of the qualifying hands, the player wins the side bet;

4. Qualifying hands:

  • Flush (all same suit): Payout 5:1;
  • Straight (consecutive ranks): Payout 10:1;
  • Three of a kind (same rank): Payout 30:1;
  • Straight flush (consecutive and same suit): Payout 40:1;
  • Suited three of a kind (same rank and suit): Payout 100:1.

5. Independent outcome: The outcome of the 21+3 bet is independent of whether the player wins or loses the main blackjack hand;

6. Payouts: Payouts depend on the hand formed and may vary by casino;

7. House edge: The 21+3 bet has a higher house edge than regular blackjack, making it riskier over time.

Note: Make sure to check the specific rules and payout table at the online casino you’re playing, as variations exist.

Payout Table

HandPayout
Suited three of a kind
100 to 1
Straight Flush
40 to 1
Three of a kind
30 to 1
Straight
10 to 1
Flush
5 to 1

Possible Winning Hands

Possible winning hands in the 21+3 side bet include a flush (three cards of the same suit), straight (three consecutive ranks), three of a kind (three cards of the same rank), straight flush (three consecutive cards of the same suit), and suited three of a kind (identical cards in suit and rank).

Suited Trips

Suited trips in the 21+3 side bet in blackjack refer to three identical cards in both rank and suit – for example, three Queen of Hearts. It’s the rarest and highest-paying hand, typically awarding 100 to 1. Suited trips combine the features of a three of a kind and a flush, making it extremely difficult to hit.

Straight Flush

A straight flush in the 21+3 side bet is a winning hand composed of three consecutive cards of the same suit. This combination is rare and ranks just below suited trips in value. It typically pays 40 to 1, though payouts can vary by casino. The odds of hitting a straight flush are low, which is why it offers such a high payout. It’s a mix of both luck and timing.

Three of a Kind

Three of a kind in the 21+3 side bet occurs when the player’s two cards and the dealer’s upcard are all the same rank, such as three Kings. This hand is less rare than suited trips or a straight flush, but it still offers a generous payout, typically around 30 to 1. It’s a strong winning combination that significantly boosts your side bet winnings when it hits.

Straight

A straight in the 21+3 side bet is formed when the player’s two cards and the dealer’s upcard create consecutive ranks, regardless of suit. This hand usually pays 10 to 1. While not as rare as a straight flush or three of a kind, it’s still a valuable win. Straight hands offer a good balance of decent payouts and reasonable odds, making them one of the more common winning hands in 21+3.

Flush

A flush in the 21+3 side bet occurs when the player’s two cards and the dealer’s upcard are all of the same suit. The cards don’t need to be in order; only the suit must match. This is one of the more frequent winning hands and typically pays 5 to 1. While the payout is lower than the other combinations, flushes offer better odds of appearing, adding steady excitement to the game.

Blackjack Games with the 21+3 Bet in India

At Casino Days, you can jump into some of the top blackjack games featuring the 21+3 side bet. Take your pick from Blackjack MH 21+3 and ONE Blackjack 1, or check out Blackjack Amsterdam, Eclipse Blackjack, and Blackjack Manchester for even more exciting action.

Why Play Online Blackjack at Casino Days in India?

The moment you create an account with Casino Days, you’ll be welcomed with a Welcome Bonus. The bonus is 200% up to 1 Lakh + 500 Free Bet. Our Indian players can choose from various payment types, including cryptocurrencies, Interac, Credit/Debit Cards, and e-wallets.

Blackjack 21+3 FAQ

Is 21+3 a Good Side Bet in Blackjack?

The 21+3 side bet adds excitement and the chance for big payouts, but it comes with a higher house edge than the standard blackjack game. While it’s fun for playing casually, it’s not considered a strong bet from a strategic or advantage-play perspective. It’s best enjoyed for entertainment rather than consistent long-term profit.

Can You Use Card Counting With a 21+3 Blackjack Bet?

Card counting techniques used in regular blackjack don’t normally work well with the 21+3 side bet. Since the bet relies on forming specific three-card poker hands, tracking individual suits and ranks becomes far more complex and impractical. Most players rely on luck rather than skill when making this side bet.

Can You Win Big Playing Blackjack 21+3?

Yes, you can win big by playing the 21+3 side bet, especially if you hit rare hands like a suited three of a kind, which often pays 100 to 1. However, these wins are uncommon, and over time, the odds favour the house. Big wins are possible, but they’re not likely or frequent.
India (English)
​

Games

Online Casino Lobby Crash Games Online Slots Online Roulette Online Blackjack Online Baccarat Game Providers

Live Games

Live Casino Lobby Game Shows Live Roulette Live Blackjack Live Baccarat Live Lotto

Casino Days

About us Terms and Conditions Privacy Policy Casino App Promotions

Help

Help and FAQ Customer Support Verify Account Payment Methods

More info

Contact Us Bonus Policy Responsible Gambling Security and Game Fairness Affiliates Sitemap

The Best Game Studios

Secure Payment Solutions

UPIIMPSBank TransferPhonePePaytmGoogle PayAstroPayVisaMastercardBitcoin

Certificates

digicert18+

Connect

Youtube Twitter Instagram

Casino Days is owned and operated by White Star B.V. that is incorporated under the laws of Curacao with company registration number 153150 and having its registered address at Korporaalweg 10, Curacao. White Star B.V. is operating under license with No. OGL/2023/159/0076 issued by the Curacao Gaming Control Board (GCB). Privado Ltd. is a company incorporated under the laws of Cyprus with company registration number HE 417876 and having its registered address at Chytron, 1, Flat/Office 301, 1075, Nicosia, Cyprus. Privado Ltd. is a facilitating company for White Star B.V.

Persons under 18 years of age are not permitted to gamble. Please check respective state laws before signing up.

If you want to get in touch with us, drop us an email at support@casinodays.com.

casino days
© 2025 Casino Days All rights reserved