If you’ve ever wondered why seasoned players actively seek out European roulette tables (and often avoid American roulette when they have a choice), the answer comes down to one small-looking detail with a big mathematical impact: single zero versus double zero.
European roulette uses a wheel with 37 pockets (numbers 1 to 36 plus a single 0). American roulette uses 38 pockets (1 to 36 plus 0 and 00). Most payouts and bet types stay the same in both versions (for example, a straight-up bet still pays 35:1), but that extra 00 changes the math behind every spin and increases the casino advantage.
This guide breaks down the practical differences between European and American roulette, explains the true meaning of house edge and RTP, and shows how rule variations like en prison and la partage can further improve expected value on even-money bets.
Quick Comparison: European vs American Roulette
| Feature | European Roulette | American Roulette |
|---|---|---|
| Wheel pockets | 37 (1–36, 0) | 38 (1–36, 0, 00) |
| Zero pockets | Single 0 | 0 and 00 (double zero) |
| Typical house edge (most bets) | About 2.70% | About 5.26% |
| Typical RTP (most bets) | About 97.30% | About 94.74% |
| Straight-up payout | 35:1 (same) | 35:1 (same) |
| Common beneficial rules | La partage or en prison may apply on even-money bets | Usually none (varies by casino) |
Wheel Layout and the “Extra Pocket” Problem
Roulette looks simple: a ball lands on a number, and you get paid based on your bet. But roulette is a textbook example of how small rule differences create meaningful long-term changes in results.
European roulette: 37 pockets
- Numbers 1 through 36
- One green pocket: 0
That means the probability of any single number hitting is 1 / 37.
American roulette: 38 pockets
- Numbers 1 through 36
- Two green pockets: 0 and 00
That means the probability of any single number hitting is 1 / 38.
At a glance, those probabilities look close. The key issue is that payouts do not improve to compensate for the extra pocket. When the wheel adds an additional losing outcome (the extra green 00), the casino advantage increases automatically.
House Edge and RTP: The Numbers That Matter
Two terms come up constantly when comparing roulette variants:
- House edge: the average percentage the casino expects to keep from each bet over the long run.
- RTP (Return to Player): the flip side of house edge, showing the average percentage returned to players over the long run.
They are directly related:
RTP = 100% − House edge
European roulette house edge (about 2.70%)
For the standard European wheel, the house edge on typical bets is approximately:
- 1 / 37 ≈ 2.7027% house edge
- 97.2973% RTP
American roulette house edge (about 5.26%)
For the standard American wheel, the house edge on typical bets is approximately:
- 2 / 38 ≈ 5.2632% house edge
- 94.7368% RTP
In practical terms, American roulette’s double-zero wheel roughly doubles the casino advantage compared with European roulette, even though the game feels nearly identical.
Why Payouts Staying the Same Changes Everything
Many roulette bets have “fair-looking” payouts that would be mathematically fair if there were no zero pockets. But roulette includes green zero pockets, and the payouts weren’t adjusted upward to compensate.
Example: Straight-up bet (single number)
A straight-up bet wins if you hit 1 specific number.
- European probability to win: 1 / 37
- American probability to win: 1 / 38
- Payout (both versions): 35:1
Without any zero, a “fair” single-number payout would be 36:1 because there are 36 numbers. Instead, you get 35:1, and that missing unit of payout is essentially where the built-in advantage comes from. When American roulette adds another zero pocket, that advantage grows because you face an extra losing outcome without improved payout.
Bet Types: Mostly the Same, But the Value Is Not
One reason roulette is so popular is that it offers many ways to bet, from simple even-money wagers to high-volatility single-number shots. Importantly, the menu of bet types is broadly the same in European roulette and American roulette. What changes is the expected value because the wheel has either 37 or 38 pockets.
Common roulette bet types you’ll see in both versions
- Even-money bets: Red / Black, Odd / Even, High (19–36) / Low (1–18)
- Dozens: 1–12, 13–24, 25–36
- Columns: three vertical groups of 12 numbers
- Outside bets: red/black, odd/even, high/low (lower volatility)
- Inside bets: straight-up, split, street, corner, six line (higher volatility)
Because most payouts are identical across versions, the extra double zero in American roulette typically means you get a worse house edge and a lower RTP on those same bets.
European Table Rules That Can Improve RTP: La Partage and En Prison
This is where European roulette can become even more attractive. Many European-style games (especially French roulette layouts) offer rules designed to soften the effect of the zero on even-money bets. Two famous rules are la partage and en prison.
La partage: “Half back” on a zero
La partage typically applies to even-money bets (red/black, odd/even, high/low). If the ball lands on 0, you lose only half your even-money stake, and the other half is returned.
That single rule can cut the house edge on even-money bets in half on a single-zero wheel:
- Standard European even-money house edge: about 2.70%
- With la partage on even-money bets: about 1.35%
- That implies an even-money RTP around 98.65%
En prison: “In prison” on a zero
En prison (French for “in prison”) also typically applies to even-money bets. When 0 hits, instead of immediately losing, your stake is “imprisoned” for the next spin.
While exact procedures vary by casino, a common implementation is:
- If the next spin wins your original even-money bet, you get your stake back (often without additional profit).
- If the next spin loses, you lose the stake.
Under typical rules, en prison produces a similar expected-value improvement to la partage on a single-zero wheel for even-money bets, resulting in a house edge around 1.35% on those specific wagers.
Important: These rules usually apply only to even-money bets
La partage and en prison are not usually applied to inside bets like straight-up, split, street, or corner. That means they are especially valuable if your preferred approach is to play outside bets with smoother swings and a stronger RTP.
How the Wheel Difference Impacts Strategy (Without Changing the “Best Bet”)
Roulette strategy is often discussed in terms of patterns, progressions, and systems. The most reliable, factual “strategy” advantage you can choose is simply selecting the version of the game with the best underlying math.
The biggest lever you control: choosing the table
Because roulette outcomes are independent and the payouts are fixed, the most meaningful long-term improvement comes from:
- Preferring single zero (European roulette) over double zero (American roulette)
- Seeking tables with la partage or en prison if you like even-money bets
This is powerful because it improves expected value without requiring bigger bets, complex systems, or riskier play.
Outside bets vs inside bets: what changes and what doesn’t
- Outside bets (like red/black) generally have lower volatility. They also benefit directly from la partage and en prison where available.
- Inside bets (like straight-up) have higher volatility and typically do not receive special zero rules. They are still better on a single-zero wheel than on a double-zero wheel, but the edge difference comes only from the wheel, not extra rules.
In other words: your favorite bet type can stay the same, and you can still improve your odds by choosing a better table format.
Online vs Land-Based Roulette: Why Rules and RTP Can Differ
Both online casinos and land-based casinos offer European roulette and American roulette, but player odds can still vary based on casino-specific table rules and game format.
Land-based roulette considerations
- Table signage matters: casinos usually label the wheel type (single zero vs double zero), but it’s worth confirming before you buy in.
- Rule variations: some venues offer en prison or la partage, and others don’t, even on European wheels.
- Minimum bets: premium single-zero or French-rule tables may have higher minimums in some casinos, but they can deliver stronger long-run value per dollar wagered.
Online roulette considerations
- More table variety: online lobbies often list multiple roulette variants and games like blackjack online side-by-side, making it easier to select European roulette quickly.
- Live dealer vs RNG: both can be fair when properly regulated; your odds still depend primarily on the wheel type and the rules (single zero vs double zero, and whether en prison or la partage is included).
- Game rules are documented: reputable online games provide clear rule text, which is useful for confirming whether zero rules apply to even-money bets.
The big takeaway: whether you play online or in-person, the best move is to treat the rules panel (online) or table placard (land-based) as part of your strategy.
How to Spot the Best Roulette Table for Expected Value
If your goal is to maximize RTP and minimize house edge, use this simple checklist before you place a bet.
Step 1: Confirm single zero vs double zero
- Look for European roulette or single zero (one green 0).
- Be cautious with American roulette or double zero (green 0 and 00).
Step 2: Check for en prison or la partage
- Prefer tables that explicitly list la partage or en prison.
- Verify which bets qualify (usually even-money bets only).
Step 3: Read casino-specific rule notes
Casinos can apply special rules or side rules. These can impact practical outcomes, so it’s smart to confirm details like:
- Whether en prison pays back the stake only, or allows a win to be paid as well (implementation varies).
- Whether any rules apply when 0 hits on even-money bets (half back, prison, or full loss).
- Whether the table offers any special bet types with different payouts (always compare the payout to the probability).
Step 4: Choose a bankroll-friendly table that you can play consistently
Better odds matter most when you can comfortably play your preferred pace and bet size. A single-zero table with rules you understand, a manageable minimum bet, and transparent conditions is often the best overall experience and value.
European Roulette, American Roulette, and French Roulette: Clearing Up the Names
These terms are sometimes used interchangeably, but they usually refer to specific configurations:
- European roulette: typically a single-zero wheel (37 pockets) with standard rules.
- American roulette: a double-zero wheel (38 pockets) with standard rules.
- French roulette: typically a single-zero wheel, often with a French table layout and commonly featuring en prison and or la partage on even-money bets.
From an odds perspective, the most important distinctions are single zero vs double zero and whether en prison or la partage is active.
House Edge and RTP in Practice: What the Percentages Mean for Players
Percentages can feel abstract, so here’s a practical way to think about them. The house edge describes average loss per unit wagered over the long run (not what happens in a short session).
Example with simple numbers
Imagine you wager a total of 1,000 units over many spins.
- On a standard European roulette table (about 2.70% house edge), the theoretical expected loss is about 27 units.
- On a standard American roulette table (about 5.26% house edge), the theoretical expected loss is about 52.6 units.
That gap is why players who care about value treat single-zero roulette as the default choice whenever it’s available.
And when you add la partage or en prison on even-money bets, the value can improve further on those specific wagers, pushing the theoretical house edge closer to 1.35% for that bet category.
Common Myths: What Doesn’t Change the Math
Roulette is fun partly because it’s visual and dramatic, which can lead to tempting myths. Staying factual helps you focus on the few choices that genuinely improve expected value.
Myth 1: A “system” can overcome double zero
Bet progressions can change volatility and the shape of your session, but they do not remove the built-in advantage created by the 00. If you want better long-run odds, selecting European roulette over American roulette is a direct, structural improvement.
Myth 2: The wheel layout order changes your odds
The physical order of numbers on the wheel (the sequence around the rim) does not change the probability of each pocket in a fair game. What changes your odds is the number of pockets (37 vs 38) and the rules applied on zero outcomes.
Myth 3: Bigger payouts mean better value
A higher payout can still be a poor value if it doesn’t match the true probability. In roulette, most payouts are standardized, so the most impactful improvement comes from choosing single zero and favorable rules like la partage or en prison.
Player-Focused Recommendations: The Best Choice for Odds
If you want the most player-friendly roulette experience while staying within the classic rules of the game, prioritize in this order:
- Single-zero roulette (European roulette) instead of double-zero roulette (American roulette).
- Single-zero tables that explicitly offer la partage on even-money bets.
- Single-zero tables that explicitly offer en prison on even-money bets.
- If your only option is double-zero, consider lowering stakes or shortening sessions if you’re trying to manage long-run cost, because the house edge is materially higher.
This approach keeps the game simple, keeps your choices transparent, and maximizes RTP without relying on complicated betting patterns.
FAQ: European Roulette vs American Roulette
Is European roulette always better than American roulette?
From a mathematical odds perspective, yes: the single zero wheel produces a lower standard house edge (about 2.70%) than the double zero wheel (about 5.26%), assuming standard payouts.
Do European and American roulette pay the same?
Typically, yes. Standard payouts like 35:1 for a straight-up bet are the same in both versions. That’s exactly why the extra 00 increases the house edge in American roulette.
What are en prison and la partage, and why do players want them?
En prison and la partage are rules often found on European or French-style single-zero tables. They usually apply to even-money bets when the ball lands on 0. These rules can reduce the house edge on those bets to around 1.35%, improving RTP and stretching bankroll value.
Do these rules apply to all bets?
Usually not. In most implementations, en prison and la partage apply only to even-money outside bets such as red/black, odd/even, and high/low.
Does online roulette have the same odds as land-based roulette?
The core odds are driven by the wheel type and rules, not the venue. Online roulette can offer excellent options because it often provides many table variants, including European roulette and French-rule tables with en prison or la partage. Always read the game rules to confirm the details.
Bottom Line: The Smallest Difference That Makes the Biggest Impact
The most important difference between European roulette and American roulette is not the vibe, the layout, or the betting options. It’s the wheel: single zero (37 pockets) versus double zero (38 pockets). That one extra 00 increases the house edge from about 2.70% to roughly 5.26% while keeping payouts largely the same.
To get the best expected value, look for single-zero tables first, and then upgrade further by choosing tables that offer en prison or la partage on even-money bets. It’s a straightforward, player-friendly move that can meaningfully improve RTP without changing how you enjoy the game.
