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One of the first concepts you should grasp is the house edge when you step into the world of casinos, whether you're playing online or at a land-based venue. This crucial factor determines how much the casino expects to win from each bet in the long run.
Understanding the house edge isn't just about knowing the odds—it's about making smarter decisions on which games to play and how to bet effectively. The more you understand this concept, the better you'll be able to manage your gameplay and potentially extend your time at the tables.
What is the House Edge on a Bet? The Basics of House Edge Advantage
The house edge, sometimes called the casino's “built-in advantage” or “built-in edge,” is a mathematical advantage that ensures the casino expects to win over time. The house edge tells the percentage of each bet that the casino intends to keep in the long run, regardless of the outcome of any individual bet. This concept applies to all casino games in all online and offline casinos, from slot machines to a table game like roulette.
For example, if a game has a house edge of 5%, the casino expects to keep 5% of all the money bet on that game over time. This doesn't mean you will lose 5% of your money each time you play or bet, but rather that over many bets, the casino will keep this bet percentage. Think of it this way: for every dollar bet, the house pockets 5 cents as their profit. Again, this house edge varies for each game and casino.
How House Edge Applies to Different Casino Games

Different casino games have varying house edges. For example, the European version of roulette has a lower house edge of 2.7%, while American roulette has a higher house edge of 5.26%. This difference arises because the American roulette wheel has an extra double zero, which increases the odds in the casino's favor. All the roulette players must consider these varying house edges when deciding which version of the game to play.
Similarly, blackjack is one of the most popular casino games with a relatively low house edge, sometimes as low as 0.5% if the player follows the optimal strategy. In contrast, games like Caribbean Stud and Sic Bo can have much higher house edges, making them less favorable to play for those looking for better game odds.
Lower House Edge and Why It Matters
When choosing a game to play, many experienced gamblers look for games with a lower house edge because these games offer better odds of winning in the short term. For instance, roulette is often favored over other games because it offers a much better built-in advantage or lower house edge. However, it's essential to remember that even in games with a lower house edge, the casino still has an advantage in the long run.
The Impact of House Edge on Slot Machines and Progressive Jackpot Slots
Slot machines are a staple in both online casinos and land-based casinos. However, they usually come with a higher house edge, ranging from 2% to 10%. Progressive jackpot slots, in particular, can have a higher house edge because a portion of each bet contributes to the jackpot. While these slots can offer life-changing payouts, the odds are typically worse than in other games. Keep these in mind when you play a game or two.
The Role of House Edge in Table Games and Sports Betting
Table games like roulette and Caribbean Stud all have different house edges, which can impact your overall gaming experience. Understanding the house edge helps you manage your expectations and make smarter bets when you play a game. For example, suppose you want to play a game in a roulette table. In that case, playing American roulette, with its higher house edge might be less favorable than playing the European version or another table game with better odds.
Sports betting, both online and offline, also involves a form of house edge, often referred to as the “vig” or “juice.” This is the percentage the sportsbook or the house takes from the total money wagered, ensuring that the sportsbook profits over time regardless of the outcome of any single event.
How is the House Edge Calculated?
The house edge is calculated by determining the difference between the true odds of winning and the payout odds offered by the casino. Before you play, here's a step-by-step breakdown of the calculation of the house edge:
Identify the True Odds
These are the actual chances of winning a bet. For example, in European roulette, the true odds of winning a single number bet are 1 in 37, as there are 37 possible outcomes (numbers 1-36 and a single zero).
Determine the Payout Odds
These are the odds that the casino pays out for a winning bet. In European roulette, a single-number bet typically pays 35 to 1.
Calculate the Expected Value
This involves multiplying the true odds by the payout for each outcome and summing them up. For example, in European roulette:
- The chance of winning: 1/37.
- The payout for a win: 35 units (plus the return of the original bet).
- The chance of losing: 36/37.
- The loss for a loss: 1 unit.
The EV is calculated as:

Calculate the House Edge
The house edge is the difference between 100% and the EV as a percentage. If the expected value is less than 100%, the house edge represents that difference.
For European roulette:

This 2.7% represents the house edge, meaning that over time, the casino will keep approximately 2.7% of all money wagered on this bet.
What is the Lowest House Edge in the Casino?
The lowest house edge in a casino is typically found in blackjack when the player uses optimal strategy. The house edge in blackjack can be as low as 0.5%, depending on the specific rules of the game and how well the player follows basic strategy.
Factors Contributing to the Low House Edge in Blackjack:
Optimal Strategy
By following a strategy chart that dictates the best move for every possible hand combination (hit, stand, split, double down), players can minimize the house's advantage.
Game Rules
Certain blackjack variations offer more favorable rules for players, such as allowing late surrender, the dealer standing on a soft 17, or doubling down on any two cards. These rules can further reduce the house edge.
Skill-Based Play
Unlike games of pure chance, blackjack involves a degree of skill, allowing knowledgeable players to make decisions that affect the outcome.
While blackjack generally offers the lowest house edge, it's important to note that this advantage can vary depending on the specific rules of the game and the player's skill level.
What is the House Edge Strategy?
The “house edge strategy” refers to the approach that players use to minimize the impact of the house edge when gambling. Since the house edge is the mathematical advantage that the casino holds over players in the long run, this house edge strategy focuses on making informed decisions to reduce potential losses and extend gameplay. Here are the key components of the house edge strategy:
Choose Games with a Better House Edge or House Advantage
As mentioned, when played with optimal strategy, blackjack has one of the lowest house edges, around 0.5%. Certain bets in craps, like the Pass Line bet with odds, offer a very low house edge, sometimes below 1%. Betting on the banker in baccarat typically has a house edge of around 1.06%.
Learn and Apply Optimal Strategy
Use a basic strategy chart for blackjack that tells you the mathematically correct decision for every possible hand. This reduces the house edge significantly. Similar to blackjack, video poker has optimal strategies that can minimize the house edge if followed correctly.
Avoid High House Edge Games
Slot machines often have a higher house edge, sometimes ranging from 2% to 10% or more. The American roulette house edge is 5.26%, higher than European roulette, which has a house edge of 2.7%. Keno is another game with a very high house edge, often exceeding 25%.
Manage Your Bankroll Wisely
Determine how much money you're willing to lose before you start gambling, and stick to it. Adjust your bet sizes to match your bankroll, ensuring you can play for an extended period without going bust quickly.
Take Advantage of Bonuses and Comps
Online casinos often offer bonuses that can be used to extend your playtime, which can help mitigate the effects of the house edge. Land-based casinos offer comps (free meals, rooms, etc.) based on your play. These can add value and offset some of your gambling losses.
Avoid “Sucker Bets”
Some bets have a significantly higher house edge and should generally be avoided. For example, in craps, the “Any 7” bet has a house edge of 16.67%. In roulette, betting on a single number (especially in American roulette) is risky due to the high house edge.
Know When to Walk Away
The house edge ensures that the casino will win over time. It's crucial to recognize when to stop your play, especially if you're on a losing streak, to avoid losing more money than you can afford.
By understanding and applying the house edge strategy, players can make more informed decisions, reduce potential losses, and increase their playtime.
How to Minimize the House Edge on the Most Popular Casino Games
While you can't eliminate the house edge, you can minimize its impact by choosing games with an acceptable house edge and understanding the game rules. For instance, knowing when to hit, stand, or double down in blackjack can significantly reduce the house advantage.
Similarly, sticking to bets with lower house edges in roulette, such as betting on red or black rather than a single number, can also help you make your money last longer.
The Importance of Understanding House Edge for Beginners
Understanding the house edge is crucial for beginners to enjoy casino games without unrealistic expectations. In the long run, knowing that the casino wins can help you approach gambling as entertainment rather than a way to make money.
By choosing games with lower house edges and playing smart, you can maximize your chances of having a fun and potentially rewarding experience.
Final Thoughts on House Edge in Casinos
Understanding the house edge is crucial when participating in any casino game. Knowing that the casino has a built-in advantage helps you make informed decisions and manage your expectations. However, you can minimize your average loss over time by choosing games with competitive odds and applying optimal strategies.
For instance, a player’s bet in blackjack can yield competitive dds when following a basic strategy, potentially leading to a winning hand. On the other hand, placing a single dollar on games like American roulette may offer worse odds (resulting in a higher average loss) due to the higher house edge.
It’s essential to be aware that while the table shows various betting options, not all carry the same risk-reward or average loss. Keep in mind that even the same games wouldn’t have the same amount of payout.
Casino personnel are always ready to assist, but the responsibility to play smartly rests on the player and how they play the game and take advantage of games with a lower house edge.
Remember, each bet is part of a larger strategy to manage your bankroll effectively. Whether you're betting a whole dollar or sticking to your original stake, understanding the house edge will help you enjoy your gaming experience with realistic expectations. The player wins (even if they lose one bet or all of their games) if they enjoy their time while playing the games.
Before you play roulette or any other game in a casino, know the house edge. Try out a game and see if you can best it and steer the game in your favor.

















