What is house edge? Most players just starting out have no idea about it. In short, it is the small built-in advantage every casino game has, baked into the odds before you ever place a bet. But you need to know more about this built-in advantage before playing. So we created this guide to explain what house edge means, how it's calculated, and what it looks like across different game types.
What Is the House Edge in Casino Games?
House edge is the mathematical advantage that a casino has over players in any game. It shows how much the casino expects to keep from all bets over time. For example, a 4% edge means the casino keeps about $4 out of every $100 wagered in the long run, not from each $100 bet.
Why Casinos Need It
Casinos are businesses, so their games need a built-in edge to stay open. You can think of it like a small markup on a product. It doesn't remove the value of what you're buying; it’s just how the business works.
How It Shapes Your Odds
House edge and player odds are two ways of looking at the same thing. A lower edge tilts the odds closer to even between you and the casino, while a higher edge widens the gap. Still, neither number can predict what will happen in a single session. House advantage applies to every casino game in some form, from slots to table games.
How Is House Edge Calculated?
The Basic Formula
To work this out, compare the real odds of winning to what the game pays out. Multiply your chance of winning by the payout, then subtract your chance of losing times your bet. The answer, as a percentage of your bet, is the house edge.
Worked Example: Roulette
European Roulette has 37 pockets, numbered 0 to 36. If you bet on a single number, you get paid 35 to 1, but your real chance of winning is 1 in 37. This creates a 2.7% house edge. American Roulette adds another zero, raising the edge to about 5.26% because of that extra pocket.
What Changes the Number
Game rules can change the house edge more than most people think. In Blackjack, factors like the number of decks used, the dealer's action on soft 17, and the payout for a natural Blackjack can each change the edge by a small amount.
House Edge vs RTP: What's the Difference?
The Mathematical Relationship
House edge and RTP (Return to Player) are two sides of the same coin, and together they always total 100%. If a game has a 4% edge, its RTP is 96%. Knowing one tells you the other.
Which Metric Should You Focus On?
Neither number is better or more correct; they just show the same thing in different ways. Casinos usually use RTP for slots, while house edge is more common for table games. If you want to learn more, our volatility guide explains how RTP and volatility work together.
Game by Game Breakdown
Each casino game category has its own typical range.
|
Game Type |
Typical House Edge |
| Blackjack (basic strategy) | Under 1% |
| Baccarat (Banker bet) | Around 1.06% |
| Craps (Pass/Don't Pass) | Around 1.36% to 1.41% |
| European Roulette | Around 2.7% |
| American Roulette | Around 5.26% |
| Slot machines | Roughly 2% to 15%, varies by title |
| Video Poker (optimal play) | Often 0.5% to 2% |
Table Games
Table games can have very different house edges depending on the bet you make. Side bets and rare wagers usually have a much higher edge than the main bets.
Slot Machines
Slot machines vary more than any other category, since every title sets its own math model. Two slots can look nearly identical and carry very different house edges once you check the published RTP.
Roulette Variants
European and American Roulette use the same type of wheel, but the extra zero on the American version almost doubles the edge. French Roulette can lower the edge even more with the "la partage" rule, which gives you back half your even-money bet if the ball lands on zero.
Video Poker
Video Poker sits closer to Blackjack than to slots, since correct strategy meaningfully changes your results. Playing a hand incorrectly can add a percentage point or more to the edge without you noticing.
Casino Games with the Lowest House Edge
If you're looking for the lowest house-edge casino games, a few stand out, but they all assume you play with the best possible strategy.
- Blackjack: Under 0.5% with solid basic strategy, one of the lowest of any casino game.
- Baccarat, Banker bet: Around 1.06%, even after the standard 5% commission on wins.
- Craps, Pass/Don't Pass: Around 1.36% to 1.41%, among the better bets at the table.
- European Roulette: 2.7%, meaningfully lower than American Roulette's 5.26%.
- Certain Video Poker variants: As low as 0.5% with perfect strategy, though weaker paytables can raise that number substantially.
Keep in mind that platforms like BitOfGold use virtual coins instead of traditional casino betting. These numbers show the general math for each game type, not any specific game. Platforms like Fire Kirin also use slot and arcade games based on the same math ideas.
Using It When You Play
Once you know what house edge is, here's how to actually use that number when you play.
Setting Realistic Expectations
House edge shows what happens over thousands of rounds, not in just one session. It's normal for your results to go above or below that number in the short term because of luck.
Choosing Games Based on Your Goals
If you play just for fun, house edge is less important than picking a game you like. But if you care about the numbers, knowing it can help you set your expectations before you play.
Bankroll Considerations
A lower edge usually means your money lasts longer during a session, if everything else stays the same. Our guide on How to Play Slots and Win, goes deeper into bankroll management alongside RTP and volatility.
Common Myths
"The House Always Wins": What This Really Means
This phrase describes a long-term statistical guarantee across millions of bets, not a rule about your individual session. Plenty of players finish ahead on any given night; the edge just describes the aggregate over time.
Can You Beat the Odds?
For most players, the house edge is simply the cost of entertainment, similar to a ticket price. Skilled advantage play in games like Blackjack can shrink or occasionally overcome it, but that takes real study, not luck. If you want more transparency, play on provably fair Bitcoin casino sites, where the payout rate is transparent, and results are random.
FAQ
Does the house always win?
The house holds a statistical edge that plays out over thousands or millions of bets, not on every wager. Individual players regularly win in the short term, since variance is part of how these games work.
Is a lower number always better?
A lower edge generally means more wagered money returns to players as a group over time. It doesn't guarantee any individual result, just more favorable long-run math.
Does it apply to every bet?
House edge is a statistical average, not a rule enforced on each bet. Over hundreds or thousands of rounds, results tend to move closer to what it predicts.
This content is for informational purposes only and is not legal advice. Casino gaming involves risk, and outcomes are never guaranteed. Play for entertainment only, within limits you're comfortable with. Ready to put any of this into practice? You can start playing anytime. This content is intended for players 21 and older. If gaming stops feeling like entertainment, you can get free, confidential support at 1-800-MY-RESET.