How Casino Game House Edges Work: Options to Compare
The house edge is the mathematical advantage a casino has over players in any game, expressed as the percentage of each bet the casino expects to keep over the long run. For example, a 5% house edge means the casino keeps $5 for every $100 wagered, on average. This edge varies widely by game: blackjack can be under 1% with basic strategy, while keno can exceed 25%. Understanding these differences helps you choose games that give you a better chance to win.
What Exactly Is the House Edge?
The house edge is the built-in advantage that ensures casinos profit over time. It is the difference between the true odds of winning and the payout odds offered. For instance, in American roulette, the true odds of hitting a single number are 38:1, but the payout is only 35:1. That $2 shortfall on a $1 bet represents the house edge, which works out to 5.26%.
This edge applies to every bet you make, not just your initial bankroll. If you bring $100 and bet $5 per spin for an hour, you might wager $150 total. The house edge grinds away at that total amount, which is why longer play increases your expected loss. As Easy.Vegas explains, the house edge is the percentage of each bet the casino keeps as profit over the long term.
House Edge vs. RTP: Two Sides of the Same Coin
Return to Player (RTP) is the flip side of the house edge. RTP is the percentage of all wagered money a game pays back to players over time. If a slot has an RTP of 96%, the house edge is 4%. The two always add up to 100%.
For slots, RTP is often published, making it easy to compare. Casino.org notes that some slots like Goblin's Cave, Ocean Princess, and Ugga Bugga have RTPs over 99%, meaning a house edge below 1%. In contrast, many standard slots have RTPs around 90-95%, giving the house a 5-10% edge.
House Edge by Game: A Comparison
The house edge varies dramatically across casino games. Here's a breakdown of common games, based on data from Easy.Vegas and First Nations Development Institute:
| Game | House Edge (with optimal play) | Notes |
|---|---|---|
| Blackjack | 0.5% – 1% | With basic strategy; can be lower with card counting |
| Craps (pass/don't pass with odds) | 0% – 0.8% | Odds bets have no house edge |
| Baccarat (banker bet) | 1.06% | Player bet is slightly higher |
| Video Poker (full-pay Jacks or Better) | 0.5% | Requires perfect strategy |
| European Roulette | 2.7% | Single zero |
| American Roulette | 5.26% | Double zero |
| Slots | 2% – 17% | Varies widely; progressive slots often higher |
| Keno | 25%+ | One of the worst odds |
Note that these figures assume optimal play. For games like blackjack or video poker, poor strategy can increase the house edge significantly. A typical blackjack player who doesn't use basic strategy might face a 2-3% edge, according to Easy.Vegas.
Why the House Edge Matters for Your Bankroll
The house edge directly impacts how long your money lasts. The formula for expected loss is: average bet size × house edge × number of bets per hour × hours played. For example, if you play $10 per hand of blackjack at a 1% house edge for 100 hands per hour, your expected loss is $10 × 0.01 × 100 = $10 per hour. In contrast, playing $1 per spin on a slot with a 10% house edge at 600 spins per hour yields an expected loss of $60 per hour.
This is why Dr. Per Cap advises that the best way to win is to use the buffet coupon and leave. The longer you play, the more the edge works against you.
Strategies to Reduce the House Edge
While you can't eliminate the house edge entirely, you can minimize it:
- Choose low-edge games: Blackjack, craps (with odds bets), and baccarat offer the best chances.
- Learn basic strategy: For blackjack, using a strategy chart can lower the edge to under 1%. Casino.org suggests memorizing charts or using composition strategies to get as low as 0.18%.
- Play full-pay video poker: Look for machines with 9/6 pay tables for Jacks or Better, which have a house edge of about 0.5% with perfect play.
- Avoid sucker bets: In craps, prop bets like "any 7" have a house edge over 16%. Stick to pass/don't pass with odds.
- Manage your time: The house edge applies per bet, so fewer bets mean less expected loss.
Remember, no strategy can overcome the house edge in the long run. These methods only slow your losses.
Common Misconceptions About the House Edge
Many players misunderstand how the house edge works. One myth is that a game with a 5% edge means you'll lose exactly 5% of your bankroll in a session. In reality, variance can lead to big wins or losses in the short term. The edge only manifests over thousands of bets.
Another misconception is that casinos rig games. As Easy.Vegas points out, casinos don't need to cheat because the mathematical advantage is built in. The house edge ensures profit over time, even if individual players win occasionally.
Finally, some believe that betting systems can beat the edge. Systems like the Martingale may change the distribution of wins and losses, but they don't alter the house edge. In fact, they can increase risk without improving expected value.
Responsible Gambling and the House Edge
Understanding the house edge is crucial for responsible gambling. It helps you set realistic expectations and budget accordingly. Dr. Per Cap reminds players to gamble only what they can afford to lose and to treat gambling as entertainment, not a way to make money. If you feel your gambling is becoming a problem, call the National Problem Gambling Helpline at 1-800-522-4700.
By comparing house edges and choosing games wisely, you can extend your playtime and enjoy the casino experience with a clearer understanding of the odds.