What Is the House Edge?
The house edge is one of the most important concepts in casino gaming. It represents the mathematical advantage a casino holds over players on any given bet, expressed as a percentage of each wager. This is how casinos make money over time — not by cheating, but through the mathematics built into every game.
For example, a house edge of 2% means that, over a very large number of bets, the casino expects to keep $2 for every $100 wagered. Individual sessions vary wildly, but over thousands of bets, the math holds.
House Edge vs. Return to Player (RTP)
These two figures are two sides of the same coin:
- House Edge = the percentage the casino keeps on average.
- RTP (Return to Player) = the percentage returned to players on average.
They always add up to 100%. A game with a 2% house edge has a 98% RTP. A game with a 14% house edge has an 86% RTP. Always look for games — and specific bets — with the lowest house edge possible.
House Edge Comparison Across Table Games
| Game | Bet Type | Approximate House Edge |
|---|---|---|
| Blackjack | Basic Strategy play | 0.5% – 1% |
| Baccarat | Banker bet | ~1.06% |
| Baccarat | Player bet | ~1.24% |
| Baccarat | Tie bet | ~14.4% |
| European Roulette | Any bet | ~2.7% |
| American Roulette | Any bet | ~5.26% |
| Sic Bo | Small/Big bet | ~2.78% |
| Sic Bo | Triple bet | ~30%+ |
| Dragon Tiger | Dragon/Tiger bet | ~3.73% |
| Dragon Tiger | Tie bet | ~32%+ |
Understanding Payout Odds vs. True Odds
The gap between true odds (the real mathematical probability) and payout odds (what the casino pays you) is exactly where the house edge lives.
Example — European Roulette Straight Up bet:
- There are 37 pockets on the wheel (0–36).
- True odds of hitting a specific number: 36 to 1 against.
- Casino payout: 35 to 1.
- The "missing" 1 unit per 37 spins is the casino's profit — about 2.7%.
Volatility and Variance: The Other Side of Odds
House edge tells you the long-run expectation, but variance tells you how wild the short-term ride can be. High-payout bets like a Sic Bo Triple (payout of up to 180:1) have low probability and high variance — big wins are rare, and long losing streaks are common. Low-payout even-money bets (Red/Black in roulette, Player in baccarat) have much lower variance — results are more consistent, win or lose.
Practical Tips for Using Odds Knowledge
- Always choose the lowest house-edge bet available — Banker in baccarat, basic strategy in blackjack, even-money bets in roulette.
- Avoid "sucker bets" — Tie bets in baccarat and Dragon Tiger, triple bets in Sic Bo, and the 5-number bet in American Roulette all carry extremely high house edges.
- Understand that no system beats the house edge — Betting patterns like the Martingale change the distribution of wins and losses but cannot overcome the built-in mathematical advantage.
- Set a budget based on expected loss, not just session length — Multiply your average bet by the house edge to estimate what you might lose per hour.
The Bottom Line
The house edge is not something to fear — it's something to understand and manage. By choosing games and bets with the lowest house edge, you maximize the value of your entertainment budget and extend your time at the table. Knowledge of odds is the foundation of every smart casino decision.