A blackjack player can win more hands than they lose and still finish the night down. The reason is often the small extra bet sitting next to the main wager: the side bet. It looks cheap and pays big, and it carries a house edge many times higher than the game it sits beside.
What is a casino side bet?
A side bet is an optional extra wager placed before the cards are dealt, settled by its own rules and separate from the main game. In blackjack it usually pays on the first cards dealt: a pair, three cards that form a poker-style hand, or a suited combination. The main hand is played exactly as normal, and the side bet wins or loses on what was dealt.
That separation is the key idea. You are not making the main hand better. You are placing a second, unrelated bet with its own odds, and those odds are set by the pay table.
How high is the house edge on blackjack side bets?
Most blackjack side bets run from about 2% to well over 10%, against roughly 0.5% for basic-strategy blackjack on typical rules. The figures below come from Wizard of Odds, and each one depends on a specific pay table and deck count.
| Side bet | House edge | What it assumes |
|---|---|---|
| 21+3 | 2.74% to 3.24% | Flat 9 to 1 on every hand, 8 to 6 decks |
| 21+3 | 4.14% | 100-35-33-10-5 pay table, 6 decks |
| 21+3 | 13.39% | 30-20-10-5 pay table with no suited trips bonus, 6 decks |
| Perfect Pairs | about 2.2% to 7.95% | Plural version, four pay tables, 8 decks |
| Perfect Pairs | 8.05% | Evolution singular version, 8 decks |
| Royal Match | 6.67% | 25 to 1 and 2.5 to 1, 6 decks |
| Lucky Ladies | 6.22% | Pay table D, 6 decks |
| Lucky Ladies | 17.64% to 24.71% | Pay tables B and A, 6 decks |
| Insurance | about 7.4% | Six decks (7.69% with infinite decks) |
The spread inside a single bet matters as much as the spread between bets. Lucky Ladies is 6.22% on one pay table and 24.71% on another. A player who sees the name and assumes a known price is guessing.
What are Perfect Pairs, 21+3, Lucky Ladies and Royal Match?
Each one pays on a different feature of the first cards dealt.
- Perfect Pairs pays when your first two cards are a pair, with larger payouts for matching colour or matching suit. Wizard of Odds notes the edge is 8.05% in Evolution's singular version with eight decks, and worsens sharply with fewer decks, reaching 12.54% with six decks and 48.08% with two.
- 21+3 treats your two cards and the dealer's up card as a three-card poker hand. It pays for a flush, straight, three of a kind or straight flush, and the edge ranges from 2.74% to 13.39% depending on the pay table.
- Lucky Ladies pays when your first two cards total 20, with the biggest payout for a pair of queens of hearts when the dealer has blackjack.
- Royal Match pays when your first two cards are suited, with a top payout for the king and queen of the same suit. One common version (25 to 1 and 2.5 to 1) has a 6.67% edge with six decks.
Deck count moves the edge in both directions. On some Royal Match pay tables the edge falls as decks are added, and Wizard of Odds lists one version as slightly favouring the player with six or eight decks. That is the exception, and operators rarely offer the pay tables that allow it.
Why is insurance counted as a side bet?
Insurance is a side bet because it is a separate wager with its own payout, offered when the dealer shows an ace. It pays 2 to 1 if the dealer's hole card is any ten-value card. The true chance of that is slightly below one in three, since four of every thirteen cards in an infinite deck are ten-values, so the bet costs the player about 7.69% in that case. In a six-deck game Wizard of Odds puts it near 7.4%, and basic strategy says never to take it.
Why do casinos like side bets?
Side bets give the table a second, much larger edge on every hand played. A player betting $25 on the main hand and $5 on a side bet hands the house a modest amount from the first and a disproportionate amount from the second, relative to the money at risk. Using house edge as the long-run cost of each wager, the side bet's share of the expected loss is far bigger than its share of the money wagered.
The appeal to players is the payout. A 25 to 1 or 100 to 1 prize makes a small bet feel like a lottery ticket, which is exactly how the game is advertised. The appeal to operators, including the online casinos that white-label platforms power, is higher hold per hand with no change to the main game's pace.
How much does a side bet cost per hour?
The cost per hour is hands per hour times the sum of each bet multiplied by its house edge. This is the expected value calculation applied to two bets at once. For example, 80 hands an hour with a $25 main bet at 0.5% costs about $10 an hour. Add a $5 side bet at 8% and it costs $32 an hour, more than triple, although the side bet is one fifth the size.
Use the calculator below to test your own numbers.
What does the side bet add to your expected loss?
Set your bets and pace, then pick a side bet. The calculator compares the expected loss of the main bet alone with the main bet plus the side bet.
Main bet only, per hour
$10
Main plus side, per hour
$42
Per 100 hands, main plus side
$53
Times more costly
4.2x
Expected loss averaged over many hands, using a 0.5% main game edge and the edge shown for the pay table named. Real results swing far above and below these averages. Not betting advice.
Can side bets ever be worth playing?
Rarely, and only on specific pay tables. Wizard of Odds lists a few versions that favour the player, such as one Royal Match pay table with fewer decks, but casinos tend to offer the versions where the house wins. The safe rule is to read the pay table for the exact game, check the deck count, and treat the side bet as entertainment with a price, not as a way to improve your odds. Advantage play such as card counting works on the main hand and does not turn a side bet into a winning wager.
If you want a wider view of how these games work online, see our guide to table and card games.
The bottom line
A side bet is a second bet with its own, usually much higher, house edge. The main blackjack game costs about 0.5% with basic strategy, while the side bets covered here run from roughly 2% to over 24% depending on the pay table. The casino does not need you to lose the main hand to profit from the table.
For operators, that math is why table game lobbies carry side bets at all: they lift revenue per hand without changing the core game. If you are planning your own casino, see our pricing for what launching a white-label casino platform costs today.
Key takeaways
- A side bet is a separate wager resolved by its own rules, usually a payout for a pair, a suited hand or a poker-style hand made from the first cards dealt.
- Basic-strategy blackjack has a house edge of about 0.5% on typical shoe rules, while the side bets in this article run from about 2.7% to 24.7% depending on the pay table.
- The same side bet can have very different edges. Wizard of Odds lists 21+3 at 2.74% with eight decks on one pay table and 13.39% on another, and Lucky Ladies at 6.22% to 24.71%.
- Insurance is itself a side bet. It pays 2 to 1 if the dealer has a ten-value hole card, and its edge is 7.69% with infinite decks and about 7.4% in a six-deck game.
- Operators like side bets because they raise hold per hand and give the table a headline jackpot to advertise, but the extra cost lands on the player.
