What’s House Edge? A Complete Guide to Casino Odds

If there’s one certainty in gambling, it’s this: the house will always win in the end.

Every casino game has a built-in advantage over the player. This advantage is also known as house edge, a mathematical advantage for the casino against the punter. Some games have a better edge than others, meaning that some games are more player-friendly than those with higher edge rates.

Understanding how casino edge works, and especially how it varies between games, is the single most important thing to learn when entering a casino.

This guide breaks down what house edge means, how it relates to RTP and casino odds, what games have the best odds, and how to adjust gameplay and strategy to fit the edge of your preferred games.

House Edge 101

To a complete beginner, the line ‘the house always wins’ might mean that the games are rigged or that regulated gambling is a scam.

But it’s not. The house edge isn't a scam or a hidden fee. It's simply the reality of how casino games work, and it’s simple math, really.

What Is House Advantage?

House edge is the mathematical advantage that casinos have over players on every single bet. It is part of the game structure, or more specifically, a built-in element that affects the way games pay out.

It’s typically expressed in percentages, just like RTP and hit rate. But we’ll get to that later.

Let’s say we are playing a game with a 2% edge.

A 2% house edge means that for every $100 you wager over time (in all of your sessions, not just one), you can expect to lose approximately $2 on average.

The rates vary a lot, so some games offer edges below 0.5%, while others take more than 15% of every bet. That is why it’s very important to choose the game wisely – not just the category, but also variant and even table – as that could save you a lot of money.

A question often arises as to why casinos implement this edge into their games.

Think of it this way: if a game had no edge, the payouts would exactly match the probability of winning. A coin flip would pay 1:1, and after thousands of flips, no one would profit.

In reality, casinos need to make money, so they slightly adjust the payouts in their favor.

An Example: Roulette Edge

Here’s a textbook example of that: roulette.

Roulette has three famous variants (European, French, and American). They all have the same number of straight numbers, but the number of zeros on the wheel affects the edge, payouts, and, as a consequence, everything else.

Here’s that in numbers:

Betting on a single number in European roulette gives you a 1-in-37 chance of winning.

If it were 100% fair, the odds would pay 36:1. Instead, the max payout is 35:1. Blink and you miss it, because that small difference, where the casino pays you as if there are 36 numbers instead of 37, is what creates the edge of 2.70%. The situation worsens with the addition of extra zeros. American roulette features 2 zeros, which means the edge is 5.26%. There’s even a version with three zeros – the Triple Zero Roulette that has a casino advantage of 7.69%.

That means that, if you are wagering $100 across a huge number of roulette rounds, the math states that you can lose $2.70 with European roulette, and much more if you choose any other roulette variant. So that’s why the choice of the game matters.

House Edge and RTP

RTP and house edge are two sides of the same coin, and they are often stated together.

They technically measure the same thing.

House advantage + RTP = 100%

In other words, RTP (Return to Player) and edge are the total payout of the game. Following the example of European roulette above, we can say that European roulette has RTP of 97.30%, while American and Triple Zero Roulette have 94.74% and 92.10%, respectively.

Why Casinos Always Win in the Long Run

Understanding the theory of house edge and RTP rates is a major step.

However, only when you actually understand how it works will you start to see profit (not just financial, of course).

There’s another important term that should factor into your strategy if you want to ensure the best possible results – expected value (EV).

Expected Value

In simplest terms, expected value (EV) is the average outcome you'd get if you could repeat a bet infinite number of times.

The rate is calculated by multiplying each possible outcome by its probability and then summing the results.

Let’s take a European roulette straight-up bet as an example:

• Win probability: 1/37 (2.70%)
• Win payout: $35 profit on a $1 bet
• Loss probability: 36/37 (97.30%)
• Loss amount: $1

Expected Value = (1/37 × $35) – (36/37 × $1) = $0.946 – $0.973 = -$0.027

That negative $0.027 per dollar wagered is the 2.70% house edge expressed in expected value terms.

Every $1 bet on a single number has a negative expected value of 2.7 cents.

But please keep in mind that short-term results can vary wildly from expected value.

In other words, one specific session might not match the EV because EV is calculated over time, over millions of bets for all players that play the game every day.

So that’s why you shouldn’t be surprised that the EV does not match your outcome (if you have won more than expected or lost more, for example).

Game Volatility

Another major term that’s closely related to edge is variance.

Variance (also called volatility) measures how much actual results stray from expected results over a given sample size. High variance means the game will fluctuate more – meaning that the changes will be big in both directions – while low variance means the game will have steadier, more consistent outcomes.

In other words, variance affects your session, while house edge affects your long-term results.

Results Will Converge Toward the Edge Over Time

If the casino is poised to always win in the end, how can they offer jackpots worth millions? And how can they weather the fact that players actually win those jackpots?

The Law of Large Numbers explains that.

The Law of Large Numbers states that as sample size increases, actual results converge toward expected results.

This explains why casinos are guaranteed to profit while individual players can still win.

Games have actual and theoretical RTP. Theoretical is the one we list in game reviews, while actual is the one that you experience in your session (it can vary because of variance).

Now, let’s imagine how actual RTP behaves against the theoretical RTP as you play more spins:

• After 100 spins: Your actual RTP might range from 70% to 130%.
• After 1,000 spins: The range narrows, maybe 85% to 110%.
• After 10,000 spins: You're probably between 93% and 99%.
• After 100,000 spins: Results cluster tightly around 95-97%.
• After 1,000,000 spins: You'd be within a fraction of a percent of the theoretical RTP.

This is why casinos can afford to pay out million-dollar jackpots. That jackpot prize might be a huge positive swing for one player, but the math already took that into consideration. It's already factored into the RTP calculation even before you step into the casino.

What does that mean for the players?

It means that the longer you play, the closer you are to achieving the house edge. Shorter sessions don’t really mean that much in the long run.

House Edge by Game

Each casino game has an edge. However, the rate can change according to type or variant of the game.

Here’s an overview of casino advantage by casino games.

Roulette

Roulette's house edge is determined almost entirely by how many zeros are on the wheel. Like we already explained, there are 4 variants.

• European Roulette (Single Zero): 37 pockets (1-36 plus one zero). House edge is 2.70% always.
• American Roulette (Double Zero): 38 pockets (1-36 plus 0 and 00). House edge is 5.26% on most bets. The extra zero nearly doubles the casino's advantage but the payouts stay the same.
• Triple Zero Roulette (Triple Zero): 39 pockets. House edge is 7.69%. The edge is three times the European edge, and the payouts are the same so it’s a very bad choice.
• French Roulette (Single Zero): European roulette with 2 specials rules that cut the edge in half on even-money bets.

French Roulette is the best option you can ever choose to play. The two rules – La Partage and En Prison, lower the edge to only 1.35%, which is perfect.

Blackjack

Blackjack is unique because it’s not a pure luck-based game, it’s also skill-based. In other words, your decisions directly impact the house edge.

On average, the edge for blackjack is 2-4%. But, if you employ perfect basic strategy, you might lower it to as low as 0.20%.

The fact that players have a chance to act first gives the dealer a slight advantage.

If you bust, you will automatically lose, even if the dealer would have busted too.

But the fact that it’s your end of the round before the dealer even had the chance to turn the second card tips the scales roughly 8% in favor of the casino.

But the edge is not 8%, because the game employs some other player-friendly rules to balance it out a bit.

For example, a bigger payout for a natural 21, double down, pair splitting, even surrender – those are all rules that balance the edge in blackjack.

Here are some of the key rules in blackjack and their changes that affect the edge.

Blackjack payouts are the first major rule change that affects odds. Traditional blackjack pays 3:2 (for example, $15 on a $10 bet). Many games also offer 6:5 ($12 on a $10 bet). This seemingly small change adds nearly 1.4% to the house edge, which is huge.

There’s also basic strategy. Without strategy, the average player gives up a huge percentage to the house through suboptimal decisions. Learning basic strategy cuts this to approximately 0.5% under standard rules.

For detailed breakdowns, see our blackjack house edge guide and our list of the lowest house edge blackjack games online.

Baccarat

Baccarat offers one of the simplest decisions in gambling: bet on Banker, Player, or Tie. The math strongly favors one choice of the three.

• Banker Bet: This bet has a house edge of 1.06% after the standard 5% commission on wins. The Banker hand wins slightly more often than the Player hand because of the drawing rules, which is why casinos charge commission in the first place.
• Player Bet: This other hand has a house edge of 1.24%. There's no commission on the bet, but the Player hand wins less frequently than Banker.
• Tie Bet: The third option has a house edge of 14.36%. Despite it has an attractive 8:1 payout, the probability of it happening is simply not worth it. This is one of the worst bets in any game.

Some tables eliminate the 5% Banker commission but change you for changing the rules. For instance, paying only half on Banker wins with a hand totaling 6. This sounds appealing but actually increases the house edge on Banker bets to approximately 1.46%, making it worse than standard baccarat.

The optimal baccarat strategy is simple: always bet on Banker, never bet on Tie. And that's it.

Craps

Craps can be quite intimidating for new players. It has a complex-looking table layout, so it overwhelms the punters. However, the main bets are straightforward and simple to understand.

• Pass Line: It has a house edge of 1.41%. This is the fundamental craps bet, made before the come-out roll. You win immediately on 7 or 11, lose on 2, 3, or 12, and any other number becomes “the point.” If the point is established, you win if the point is rolled again before a 7.
• Don't Pass: House edge of 1.36%. The opposite of Pass, because you're betting with the house against the shooter. It has sightly better odds, but it's socially frowned upon at crowded tables.
• Come/Don't Come: it's the same mechanics and house edge as for Pass/Don't Pass, but you place this bet after a point is established.
• Odds Bets: After a point is established, you can place an additional “odds” bet behind your Pass or Come bet. This bet pays at true odds with zero house edge. The more odds you take, the lower your combined house edge.

The optimal craps strategy entails betting on Pass or Don't Pass, essentially.

Video Poker

Video poker is one of the few casino games where you can achieve near-even or occasionally positive expected value. It's why it's so widespread and popular even though it's outdated and there are far better games to try online today.

However, we must note that the near-perfect results are possible only with the right pay table and perfect strategy.

Video poker machines are categorized by their pay tables. That's how we recognize which variant we like or dislike, essentially.

The names come from the described payouts for Full House and Flush. “9/6 Jacks or Better” pays 9 coins for a full house and 6 for a flush (per coin wagered).

Here's an example of a 9/6 Jacks or Better paytable.

The difference between 9/6 and 6/5 is enormous, it's 4.54%!

There are some video poker variants that may have a positive EV too. This is rare, but possible.

• Deuces Wild (Full Pay): 100.76% RTP
• Double Bonus (10/7): 100.17% RTP

These games are extremely rare and typically found only in specific Las Vegas casinos competing for advantage players.

Slots

Slot machines have the widest range of house edges in the casino. They can go from under 2% for the best online games to over 15% for some land-based machines and/or progressive jackpots.

When it comes to online slots, they typically boast 94-98% RTP. However, if you are playing at a brick-and-mortar casino, you will face a 85-93% RTP. Jackpots are also sometimes below 90%.

Many players believe slots adjust their payouts based on recent results, like getting “tight” after big wins or “due” after long losing streaks. This is false. Each spin is completely independent, determined by a Random Number Generator (RNG) that doesn't remember previous results.

Certified slots in regulated markets cannot alter their RTP based on:

• How much you've won or lost
• How long you've been playing
• Time of day or day of week
• How much is in the machine
• Anything else

The RTP is fixed by the game's programming and verified by testing labs. Your results vary from session to session due to variance, not manipulation.

A slot with 96% RTP doesn't return $96 of every $100 you wager. It returns 96% across millions of spins by millions of players. In your 500-spin session, you might see anywhere from 70% to 150% return—and both are statistically normal.

This is variance, not cheating. The more you play, the closer your personal results will approach the published RTP.

For more information on how RTP actually works, see our guide to theoretical vs actual RTP.

Rules & Side Bets That Also Raise the Edge

Casinos offer numerous optional bets and game variations that look appealing but carry dramatically higher house edges. Knowing what to avoid is as important as knowing what to play.

Blackjack Side Bets

Side bets in blackjack offer big payouts for specific card combinations.

• Insurance: Offered when the dealer shows an Ace. You're betting that the dealer has blackjack, paid at 2:1. The actual probability is about 30.8% (less than the 33.3% that would make 2:1 fair). House edge: approximately 7.5%. Insurance is mathematically terrible regardless of your hand, even if you also have blackjack.
• Perfect Pairs: Betting that your first two cards will be a pair. Payouts vary, but house edges typically range from 2% to 11% depending on the pay table.
• 21+3: Combining your first two cards with the dealer's upcard to make poker hands (flush, straight, three of a kind, etc.). House edge ranges from 3.24% to over 13%.
• Lucky Ladies: Betting that your first two cards total 20. House edge typically 17-25%.

These bets don't affect your main hand, so the entertainment value is separate from your blackjack strategy. But they erode your bankroll far faster than the base game. A player making Insurance bets and one side bet per hand might face an effective house edge 5-10 times higher than basic strategy alone.

See our detailed breakdown of blackjack side bet house edges.

Roulette

Two roulette situations carry significantly worse odds than standard bets:

• The Five-Number Bet (0, 00, 1, 2, 3): Only available on American double-zero wheels. Pays 6:1 but covers only 5 of 38 numbers. House edge: 7.89%—the worst bet on a standard roulette table. The mathematical quirk occurs because this is the only bet where the numbers covered don't fit neatly into the 38-pocket wheel.
• Triple-Zero Wheels: Some Las Vegas casinos have introduced wheels with 0, 00, and 000—39 pockets total. The house edge on all bets rises to 7.69%. There's no strategic reason to ever play a triple-zero wheel when single or double-zero options exist.

Baccarat

Like blackjack, baccarat offers optional side bets with dramatically higher edges:

Theoretical Edge Cases: Under specific conditions, some side bets like Dragon Bonus can theoretically become positive EV deep into a shoe when certain cards have been removed. In practice, this is nearly impossible to exploit:

1. Online baccarat shuffles frequently or continuously
2. Live tables use 8 decks with deep cut cards
3. Capped payouts eliminate most advantageous situations
4. The edge only appears in extremely rare deck compositions

For all practical purposes, baccarat side bets are entertainment expenses, not strategic plays.

How Fairness Is Regulated

If you regularly play slots, you must have heard of the term ‘loose slot’ so far.

In fact, many players believe games feel “tighter” or “looser” at different times, most often slots.

But that’s not actually true. It’s all variance and RTP and house edge, as we explained above. Game fairness is regulated by labs and official regulators who ensure that RTP is not only fair but also maintained all the time.

Major testing labs that test games independently include:

• GLI (Gaming Laboratories International): The largest testing lab worldwide, certifying games for US, European, and Asian markets.
• eCOGRA: London-based organization providing testing and player protection certification.
• BMM Testlabs: Major lab servicing North American and Australian markets.
• iTech Labs: Specializes in RNG testing and game mathematics certification.

Testing of games covers a variety of factors and elements, including RNG integrity and unpredictability to ensure the games are not possible to break, actual returns that should match RTP stated by the developer, the structure and security of the game.

When it comes to official gambling regulatory bodies, their job is to oversee the market and ensure that rules are complied with.

The rules look different in different markets, though. For example:

• UK Gambling Commission requires all games have published RTP, regular audits, and player complaint mechanisms.
• Malta Gaming Authority also requires all gams to possess RNG certification and minimum RTP standard, plus compliance is monitored nonstop.
• US state gaming commissions each require certificates from state-approved testing labs.

Any form of rule violation or failure to comply with the guidelines can potentially lead to investigation and even fines.

Multi-RTP Slot Versions

If you are a fan of slots, you must have noticed that games typically come with one RTP, but there are also games that have different RTP settings. For example, a default value and then alternative RTP rates.

For example, when a slot is available in 96.5%, 94.5%, and 92.5% versions.

But why do these variants exist?

Studios and operators may have different business models and work in different markets where the competition has higher or lower standards.

For instance, in the UK most games – especially slots – are above 96% RTP. These are labelled as high-value RTP games.

On the other hand, the casinos may use games with lower RTPs to offset the cost of bonuses they offer to their players. Finally, it’s a good marketing gimmick: brands like to use RTPs that are higher to promote a player-friendly image.

Regulatory requirements in the UK mean that the minimum is 85% RTP, but competition makes studios keep the RTP above 92%. MGA jurisdictions also have the same rules and studios must disclose the RTP.

To check RTPs, look into game reviews, rules and paytable sections in-game, or FAQs provided by game studios.

How to Keep the Edge Lower

Understanding house edge is important, but gambling should be fun.

Here are some tips that can help you keep the lower edge while still having a fun and exciting experience.

Pick Games with a Lower Edge

It does not matter what type of game you like; there’s always a version that has a better advantage for you. For instance, if you like roulette, try to play French or European instead of American roulette.

With blackjack, swap your 6:5 blackjack table for one that pays 3:2 for blackjack.

Learn Basic Strategy

Basic strategy has an immense impact on the game. If you become proficient, you can take down the advantage by 1.50%.

Skip Side Bets and Live Games If You Can

Side bets and game shows have their place and purpose, but you should know when to play and when to pick something safer.

When They Are Great

• If you have a specific budget that is not part of your bankroll for main bets
• If you're playing for fun, not for profits
• You can afford to lose all that you wagered

When to Steer Clear

• If you are still playing with wagering requirements
• If you cannot afford to lose what you wagered
• If you are playing for longer sessions
• If you are on a losing streak and think you should chase losses

Live game shows, such as Dream Catcher and Crazy Time, are live games with a twist. They offer spectacle, so it’s all about entertainment, big prizes, big multipliers, etc. The house edge is almost always higher, so you should be careful with how often you play.

Frequently Asked Questions

• What is a good house edge for casino games?

Anything under 2% is player friendly. The best mainstream options: blackjack with basic strategy (0.5%), baccarat Banker bet (1.06%), craps Pass Line with odds (under 1%). Video poker with optimal pay tables and strategy can drop below 0.5%.

• Does house edge guarantee I'll lose exactly that percentage?

No. House edge describes long-term averages over millions of bets. In any individual session, you might win substantially or lose everything. Variance creates wild short-term swings, the edge only manifests over extended play across large sample sizes.

• Are online casino games rigged to beat the house edge?

At licensed, regulated casinos, no. Games use certified RNGs tested by independent labs (GLI, eCOGRA, BMM). They cannot adjust results based on your play history. If you're at a casino licensed by UKGC, MGA, or US state gaming commissions, the games meet published RTP standards.

• Can I beat the house edge with betting systems like Martingale?

No betting system can overcome house edge. Martingale and similar strategies change the distribution of wins and losses but don't alter the underlying mathematics. Every bet still has negative expected value. Systems can help manage bankroll volatility but cannot create profit from a negative-expectation game.

• Which casino game has the lowest house edge?

Video poker Deuces Wild (full pay) offers 100.76% RTP, which is actually positive expected value, with perfect strategy, though such machines are extremely rare. More commonly, single-deck blackjack with favorable rules and perfect basic strategy offers approximately 0.13% house edge (99.87% RTP).

• Why do slots have higher house edge than table games?

Slots require no skill, decisions, or learning, so just spin and wait. The higher edge (typically 2-10%) compensates for convenience, entertainment value, and lower barrier to play. Table games reward knowledge with better odds but demand strategy.

• What's the difference between RTP and hit frequency?

RTP measures total money returned as winnings over time (percentage of wagers). Hit frequency measures how often any winning combination appears (percentage of spins). A slot can have high RTP with low hit frequency (rare big wins) or moderate RTP with high hit frequency (frequent small wins). They measure different things.

Key Takeaways

The house edge is unavoidable, but it does not have to be your adversary – it can be you ally in conquering casino games. There are some things you can do to make it work in your favor.

First, choose games with better odds. The difference between 0.5% and 5% is enormous, so if you don’t want it affecting your bankroll, pick games with lower edge, such as baccarat, 3:2 blackjack, French or European roulette.

If you are playing a card game such as blackjack, learn basic strategy – it can cut the edge by 1.5% or even more. And if you can help it, steer clear from side bets. They are meant to be exciting, not a source of steady profit.

More importantly, pick a casino that is trusted and fair. Transparency is key. Licensed operators must meet RTP standards and provide accurate game information. You can – and should – check what you're getting before you play.

Gambling should be fun but at a known cost. Learning and understanding casino advantage helps you know how much your fun can cost you and ensures the math never surprises you