21+3 blackjack is a popular side bet variation that combines standard blackjack gameplay with a poker-style bonus wager. The side bet focuses on the player’s first two cards and the dealer’s upcard, evaluating them as a three-card poker hand. It adds excitement and the chance for big payouts beyond the main game.
The 21+3 bet wins if the three cards form a flush, straight, three of a kind, or straight flush. Payouts vary by casino but can reach 100:1 for a suited three of a kind. While the main blackjack game follows traditional rules, the side bet introduces an extra layer of risk and reward.
To play 21+3, you place an additional wager before cards are dealt. The bet is settled based on the combination of your two cards and the dealer’s upcard. For example, if you’re dealt two hearts and the dealer shows a heart, that’s a flush and pays 5:1 in most versions.
The bet is independent of the main blackjack outcome—you can lose the hand but still win the side bet. However, it carries a much higher house edge than the base game, often exceeding 3%, making it a high-risk addition best suited for entertainment rather than profit.
Payouts for 21+3 vary by casino, but a common structure includes 5:1 for a flush, 10:1 for a straight, 30:1 for three of a kind, and 40:1 for a straight flush. Some premium versions offer 100:1 for a suited three of a kind, where all three cards match in rank and suit.
Despite the attractive payouts, the odds of hitting these hands are low. A straight flush occurs roughly once every 300 hands. This makes the bet appealing for its jackpot potential but poor for consistent returns. Always check the payout table before playing.
There is no effective strategy to improve your odds on the 21+3 bet—it’s purely based on chance. Skilled blackjack players stick to basic strategy for the main game and treat 21+3 as optional entertainment. The high house edge means it should be played sparingly, if at all.
Verdict: 21+3 blackjack adds fun and variety but isn’t recommended for serious players focused on minimizing losses. It’s best used as an occasional thrill, not a core part of your betting strategy.
Can you win 21+3 without winning the hand?
Yes—the 21+3 bet is independent. You can lose the blackjack hand but still win the side bet if your two cards and the dealer’s upcard form a qualifying poker hand.
What is the house edge on 21+3?
The house edge typically ranges from 3% to 7%, depending on the payout structure. It’s significantly higher than the main blackjack game, making it a riskier bet.
Is 21+3 available in online blackjack?
Yes, many online and live dealer blackjack games offer the 21+3 side bet. It’s commonly found in variants with bonus wagers and multiple betting options.
Play responsibly. Gambling can be addictive. Set a limit and stop if it stops being entertainment. 18+.