What Is the House Edge?
The house edge is the mathematical advantage that a casino holds over players in any given game. It's expressed as a percentage of every bet that the casino expects to retain over the long run. It's not a fee — it's built into the rules and odds of each game.
For example, if a game has a house edge of 5%, the casino expects to keep an average of $5 for every $100 wagered over a large number of bets. In any single session, results will vary dramatically, but over thousands of players and millions of bets, the casino always comes out ahead.
Why the House Always Has an Edge
Casinos design games so that the payouts are slightly less than the true mathematical probability of winning. This small gap is the house edge. It's how casinos remain profitable businesses while still allowing players to win regularly.
House Edge by Game Type
| Game | Approximate House Edge | Notes |
|---|---|---|
| Blackjack (basic strategy) | 0.5% – 1% | One of the lowest edges available |
| Baccarat (Banker bet) | ~1.06% | Simple, low-edge option |
| Craps (Pass Line) | ~1.41% | Good value at the craps table |
| Roulette (European) | ~2.7% | Single zero wheel |
| Roulette (American) | ~5.26% | Double zero adds extra edge |
| Slots | 2% – 15%+ | Varies widely by game and casino |
| Keno | 20% – 35% | Very high house edge |
House Edge vs. RTP
These two terms are simply two sides of the same coin:
- RTP (Return to Player) = 100% minus the house edge.
- A game with a 96% RTP has a 4% house edge.
- A game with a 2.7% house edge has a 97.3% RTP.
When you see RTP listed on a slot machine, you can immediately calculate the house's mathematical advantage.
How the House Edge Affects Your Money Over Time
The house edge is applied to your total wagered amount, not just your starting bankroll. If you start with $100 but make 100 bets of $5, you've wagered $500 total — and the house edge applies to all of that. This is why longer sessions statistically move results closer to the expected edge.
Can You Beat the House Edge?
In the short term, yes — luck plays a huge role, and players win all the time. But over the long run, the math holds. Strategies like basic strategy in blackjack can minimize the house edge to its lowest possible point. Card counting (where legal) can theoretically flip the edge slightly, though casinos actively work to prevent this.
For most casino games, no strategy completely eliminates the house edge. The goal of smart play is to choose games with lower edges, minimize mistakes, and manage your bankroll so you get maximum entertainment from your budget.
Choosing Games With a Lower House Edge
If minimizing the house's advantage matters to you, prioritize these games:
- Blackjack with basic strategy
- Baccarat (Banker or Player bets only — avoid the Tie bet)
- Craps (Pass/Don't Pass with full odds)
- European Roulette over American Roulette
- Video Poker (Jacks or Better with optimal play)
Final Thought
Understanding the house edge doesn't remove the fun from gambling — it empowers you to make informed choices. Knowing which games offer better odds lets you stretch your bankroll further and enjoy the experience for longer.