House Edge Explained + Quick Calculator
House edge is the percentage of each bet the casino expects to keep over the long run. Understanding it helps you choose games and rules that give you the best chance.
Written by Jordan Cole, Lead Editor, Math & Strategy · Last updated 2026-07-19
Written by What is house edge?
House edge is the casino’s average advantage on a wager, expressed as a percentage of the amount bet.
If a bet has a 5% house edge, the casino expects to earn about $5 per $100 wagered over the long run.
House edge vs. RTP (important difference)
- RTP (Return to Player) = what the game returns on average.
- House edge = 100% − RTP.
Example: 96% RTP → 4% house edge.
House Edge Calculator
Use whichever tab matches the number you actually have — most slots publish RTP, while table games and custom bets are easier to work out from win probability and payout odds.
From RTP (Return to Player)
If you don't have either number handy, check the game's published rule sheet or paytable — house edge is only ever an average over many bets, never a guarantee for any single spin or hand.
Typical house edges by game (rough guide)
| Game | Typical House Edge | Notes |
|---|---|---|
| Blackjack (good rules + basic strategy) | ~0.5% | Rules and strategy matter a lot. |
| European Roulette | 2.7% | Single-zero wheel. |
| American Roulette | 5.26% | Double-zero wheel. |
| Slots | Varies widely | RTP depends on the game. |
Why small edges matter
The more you bet (and the longer you play), the more the math dominates.
That’s why skilled players focus on:
- Lower house edge games
- Better rules (especially in blackjack)
- Disciplined bankroll management
FAQ
Can I beat the house edge?
Most casino games cannot be beaten long-term, but some situations (like advantage play or promotions) can reduce or overcome the edge.
Why does blackjack have a low house edge?
Because player decisions affect outcomes, and basic strategy minimizes the casino’s advantage under good rules.
Is RTP always accurate?
RTP is a long-run average; your short-term results can be very different due to variance.
Related next steps
- Gambling Glossary (quick definitions)
- Gambling Basics 101 (start here)
- Responsible Gambling (play safe)
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