Casino House Edge

What house edge means

The house edge is the casino's revenue expressed as a percentage of the amount you originally bet⁵. Another way to say it: it is the slice of every wager the casino keeps on average over time. The higher the house edge, the more the odds favor the casino over you⁵.

Every casino game has a built-in advantage in favor of the house. A skilled player may reduce the house edge, but it is never completely eliminated⁶. The Japanese term for the same idea, 控除率, literally means the percentage of fee taken on a bet⁴.

The most useful way to read a house edge figure is as an average loss rate. A game with a 3.333% house edge means an average loss of JPY 333 for every JPY 10,000 wagered⁷. That does not describe any single session, where luck dominates, but over many bets your results drift toward that percentage. If a slot shows 96% return to player, the remaining 4% is the house edge, the built-in slice that stays with the casino over time.

Return to player (RTP) is simply the house edge flipped around. A game with a 2.7% edge returns 97.3% of wagered money to players on average, which is why European Roulette is often listed as RTP 97.3%⁸.

The numbers side by side

Here are the headline figures for the bets most visitors actually make. Each figure assumes the standard version of the game and, where noted, correct play.

A few things jump out. Blackjack and baccarat sit in a different league from roulette and slots. The banker bet in baccarat carries an edge of only about 1.06%, which is one reason baccarat dominates Macao gaming and is typically the only game offered in VIP rooms there¹⁰. Slots sit at the other end: slot machines return less to players than table games such as blackjack and roulette¹¹.

Ranges matter too. Published figures for blackjack vary from 0.5% to 2% depending on rules and play⁴, baccarat from about 1% to 14% depending on which bet you take⁴, and slots from 3% to 15% depending on the machine⁴.

Blackjack: lowest edge, but only with correct play

Blackjack played with correct decisions has one of the lowest house edges in the casino, while careless play hands that advantage back¹². The headline figure of about 0.5% applies to an eight-deck game paying 3:2 for a blackjack, following basic strategy⁹. Some official guides put standard blackjack even lower, at roughly 0.4%¹³.

The catch is that the number only holds if you play every hand correctly. Players who make suboptimal decisions increase the house edge significantly, sometimes to 2% or higher¹⁴. Unlike most other table games, blackjack is a game where skill can genuinely improve your odds¹⁵.

The payout rule on a natural blackjack matters more than anything else. A 3:2 table, where a natural pays 3:2, is better than a 6:5 table¹⁶. On a $10 bet, a 3:2 natural wins $15, while a 6:5 table pays only $12, which meaningfully raises the house edge over a session¹². A typical live game uses eight decks, with the dealer drawing on 16 or less and standing on 17 or more, and blackjack paying 3 to 2¹⁷.

Rule variations shift the number. European Blackjack, a two-deck variant where the dealer takes no second card until players have acted, comes in at 0.62%⁹. American rules tend to run slightly higher, while European rules often run slightly lower¹⁸. Live dealer variants measured by independent analysts range from 0.35% to 0.57%, with a few as low as 0.11% to 0.15%¹⁹. VIP live tables sit at approximately 0.50% with optimal play¹⁸.

Regional variants can beat standard blackjack. In Sydney, Pontoon offers a house edge about one third less than conventional blackjack²⁰. Side bets usually go the other way: the C4 side bet in Spanish 21 carries a house edge of 14.48%¹⁹.

For the full rules on doubling, splitting and insurance, see blackjack rules in Asian casinos.

Baccarat: banker, player and tie bets compared

Baccarat, also known as punto banco, is one of the oldest and most popular games in casinos all over the world, and it is especially popular among high-rollers and Asian gamblers²¹. In essence it is a simple guessing game: you bet on which of two dealt hands, Player or Banker, will end up closer to 9 points²². Aces count 1, tens and face cards count 0, and only the rightmost digit of a total counts, so a hand of 12 is worth 2². If either hand starts with 8 or 9, that is a natural and no more cards are dealt².

Because the drawing rules are fixed, you make no decisions after placing your bet. All bets must be placed before the cards are dealt²³. That makes baccarat a game of pure chance, and it makes the three main bets easy to compare:

• Banker: pays 1 to 1 minus a 5% commission, house edge about 1.06%²
• Player: pays 1 to 1, house edge 1.24%²
• Tie: house edge 14.36%²

The 5% commission on winning banker bets is what keeps the banker bet from being a straight 50-50 proposition²². Even after commission, banker remains the better of the two main bets, which is why it is the workhorse of baccarat play.

Side bets are where the edge climbs. Player Pair and Banker Pair wagers carry a house edge of 10.36%²⁴. Tiger side bets run higher still: Small Tiger at 14.33% and Big Tiger at 15.25%²⁴.

Variants shuffle the numbers slightly. No Commission Baccarat drops the 5% commission on banker wins but keeps the Player bet at 1.24% and the Player Pair at 10.36%²⁶. Baccarat 27 lists the Banker bet at 1.72%, the Player bet at 1.24%, pairs at 10.36%, Big Tiger at 15.25% and a Super Tie bet at 16.51%²⁵. For how these versions differ at the table, see baccarat variants, and for the drawing rules, baccarat rules.

Roulette: why the single zero matters

Roulette is a spinning wheel with red and black slots numbered 1 to 36, plus green zero slots²⁷. The number of zeros is the whole story for the house edge.

A single-zero (European) wheel carries a house edge of 2.7%, compared to American Roulette's 5.26%³. On an American wheel the house edge on all bets is 1/19, or 5.26%, except for the 0-00-1-2-3 combination, which carries 7.89%²⁷. The reason is simple: a straight-up number pays 35 to 1, but with 38 pockets on a double-zero wheel the true odds against you are worse than that payout implies⁸.

Newer variants make the zero problem worse. Triple-zero roulette carries a house edge of 1/13, or 7.69%, on every bet, and quadruple-zero roulette reaches 10% on every bet²⁷. Single-zero tables are rare in some regions: the only single-zero roulette in California is at the Barona casino, with a house edge of 2.70%²⁷.

The edge is the same on almost every bet on the wheel, so the choice between red/black, dozens or single numbers changes your variance, not the casino's cut. Multiplier variants like Lightning Roulette add bonus multipliers of up to 500x, at the cost of a different payout structure²⁸. On electronic roulette tables there is no croupier; the wheel spins automatically each time a player makes a bet²⁹.

For bet types and the full payout table, see roulette rules.

Sic Bo and Dragon Tiger: dice and single-card odds

Sic Bo is played with three standard dice shaken in a plastic cup, with players betting on the outcome of the roll²⁹. The betting layout offers everything from single-dice picks to specific triples, and the house edge varies widely across the layout. Multiplier versions such as Super Sic Bo add random multipliers of up to 1000x per round²⁸.

Dragon Tiger is effectively a two-card version of baccarat. One card is dealt to the Dragon box and one to the Tiger box, and the higher card wins; the Ace is the highest card, followed by King, Queen, Jack, Ten down to Two, and the suit makes no difference¹⁷. The main Dragon and Tiger bets carry a house edge of about 3.7%, with an overall RTP of 96.7%¹⁴. It is a fast game, one card per side and no decisions, which is why it spreads quickly across Asian gaming floors.

Both games are pure chance: once your chips are down, nothing you do changes the outcome. For the full betting layouts, see Sic Bo rules and Dragon Tiger rules.

Slot machines: paylines, RNG and jackpot odds

Slot machines are the least favorable games on the floor in terms of return to player, returning less than table games such as blackjack and roulette¹¹. The average house edge runs around 8%², with published figures ranging from 3% to 15% depending on the machine⁴.

How the machine works explains why. A payline is a line crossing one symbol on each reel where winning combinations are evaluated, and your chance of hitting a winning combination is higher the more paylines you select³⁰. Wild symbols substitute for other symbols on the line, and three Scatter symbols landing anywhere on the reels typically trigger a free game feature³⁰. The prize table pays based on one bet credit, with higher bets multiplying the prize³⁰.

Two facts about slot odds are worth fixing in mind. First, the odds are fixed and do not change regardless of how you play³¹. Second, the odds always favor the house, so over time the chance of winning back more money than you started with is low³². A machine that has not paid out recently is not "due"; the odds of each spin are the same.

Jackpots are the extreme case. The odds of hitting a slot jackpot can be as low as 1 in 17,000,000 spins³³. Progressive jackpots pool a slice of every bet into a growing prize, and in rare cases a long-unwon progressive can push a machine's expected value above 100%⁴, though the base game around it still carries its normal edge.

For denominations, jackpot types and RTP figures at Asian venues, see slot machines in Asian casinos.

How skill changes the numbers

Skill affects the house edge in very different ways depending on the game.

In blackjack, skill is the whole ballgame. Basic strategy brings the edge down to about 0.5%⁹, and card counting can lower it a further 1 to 2%⁴. Careless play pushes it the other way, sometimes to 2% or higher¹⁴. No skill level eliminates the edge entirely¹².

In baccarat, Sic Bo, Dragon Tiger and roulette, skill plays no role at all. The drawing rules are fixed, the dice and wheel are blind, and the only decision you make is which bet to place²². Choosing the banker bet over the tie bet in baccarat is not skill; it is simply picking the lower number from a fixed menu.

In slots, skill does not exist in any form that changes the odds. The odds are fixed regardless of how you play³¹, so timing, bet-sizing patterns and machine-switching rituals have no effect on the house edge.

Even in skill-adjacent games, the fine print matters. In Australian Pontoon, the Envy Bonus lowers the house edge by only 0.0015% per additional player in a six-deck game, and the Super Bonus by 0.030%²⁰. These are rounding errors, not strategies. The practical takeaway: the published house edge is the number that matters, and the only reliable way to change it is to play the games and bets where it is already low.