The Decision You Face at the Table
You walk up to a roulette table and the layout looks almost identical. The felt, the numbers, the betting grid. But the wheel itself tells a different story. One wheel has a single green pocket marked with a zero. The other carries two green pockets: a zero and a double zero. That one extra pocket is the entire conversation. It changes nothing about how you place a bet, but it changes everything about what that bet costs you over time.
The question of which wheel is better is not about which one is more fun to play or which one fits the room's atmosphere. It is a question about the mathematical structure of the game. A European wheel has 37 pockets. An American wheel has 38. The extra pocket on the American wheel is a house number that pays no player on any outside bet and only pays on a direct inside wager. Every other number on the wheel keeps its normal payout, but the presence of that extra green pocket shifts the odds on every single spin.
How the House Edge Is Built Into Each Bet
Roulette does not hide its edge in a complicated rule. The edge is built into the payout schedule. A straight-up bet on any single number pays 35 to 1. If the wheel had 35 pockets, that payout would make the bet perfectly fair. But the wheel has more pockets than the payout implies. On a European wheel, there are 37 pockets and the payout still assumes 35. That gap between the number of pockets and the payout is where the operator's advantage lives.
On an American wheel, the gap widens. There are 38 pockets, and the payout for a straight-up bet remains 35 to 1. The player is not being paid for the extra pocket. That single structural difference means the American wheel holds a larger mathematical advantage than the European wheel on the same bet. The relationship is not a matter of opinion or table style; it is a consequence of the wheel's geometry.
| Feature | European Wheel | American Wheel |
|---|---|---|
| Total pockets | 37 | 38 |
| Green pockets | One (single zero) | Two (zero and double zero) |
| Straight-up payout | 35 to 1 | 35 to 1 |
| House advantage on most bets | Lower | Higher |
| Where the extra edge comes from | One fewer pocket than the American wheel | The double-zero pocket |
The table above shows the comparison in structural terms. The exact percentage of the house edge for each bet type is published in the game's information panel or the table rules where you play. What matters for the decision is the direction of the difference, not the precise number. The American wheel's extra pocket makes every bet on that wheel carry a larger expected loss than the equivalent bet on a European wheel, under the same rule set.
RTP and House Edge Under One Rule Set
Return to Player (RTP) and house edge are two ways of describing the same relationship from opposite sides. RTP is the theoretical percentage of total wagered money a game returns to players over a very large number of spins. House edge is the mathematical advantage the operator holds on a given game, expressed as a percentage of each wager. For the same bet under the same rule set, the two figures sum to 100%.
When you compare a European wheel and an American wheel, you are comparing two different rule sets. The RTP on a European straight-up bet is higher than the RTP on an American straight-up bet, because the American wheel has one more pocket that pays nothing on that bet. The house edge moves in the opposite direction. A higher RTP means a lower house edge, and a lower RTP means a higher house edge. The two figures always move together in opposite directions for the same bet.
The key word is "same bet." Different bets on the same wheel carry different edges. A straight-up bet and a red-or-black bet on the same European wheel do not have the same house edge, because the payout structure differs. When you read an RTP figure or a house edge figure, check which bet it describes and which wheel it assumes. A figure published for a European wheel does not apply to an American wheel, and a figure for an outside bet does not apply to an inside bet.
Why Short Sessions Look Nothing Like Long-Run Averages
RTP and house edge are long-run statistical averages. They describe what happens over a very large number of spins or hands, not what happens in an hour at the table. In a short session, almost anything can happen. You can win on an American wheel and lose on a European wheel. You can hit a straight-up number twice in a row. You can watch the ball land on black ten times consecutively. None of that changes the underlying mathematics.
Variance is the reason short sessions diverge from the long-run average. Variance describes how payouts are distributed over time. Roulette is a high-variance game on inside bets and a lower-variance game on outside bets, but every spin carries the same house edge regardless of the bet you choose. A player who wins in a short session has not beaten the edge. They have experienced a run of outcomes that sits on the favourable side of the distribution. The edge is still there, applied to every wager, waiting for the long run to assert itself.
This is why the choice between wheels matters more the longer you play. In a single spin, the difference between a European and American wheel is invisible. Over a thousand spins, the difference compounds. The American wheel's extra pocket means the player loses a slightly larger share of every wager, on average, and that share accumulates with every spin. The player who wants to minimise expected loss over a long session should choose the wheel with fewer pockets, all else being equal.
What Decisions Per Hour Do to Total Exposure
The house edge is applied to every wager, not to your starting bankroll. That means the total amount you wager over a session matters as much as the edge itself. If you place 50 bets in an hour at a fixed stake, your total exposure is 50 times that stake. The expected loss is the house edge applied to that total exposure, not to the money you sat down with.
Roulette is a fast game. The wheel spins, the ball drops, the croupier clears the layout, and the next round begins. A player who bets on every spin is making many decisions per hour, each one adding to total exposure. A player who bets only occasionally, or who sits out spins, is making fewer decisions and therefore exposing less money to the edge. The wheel you choose interacts with this: a higher-edge wheel costs more per unit wagered, and a faster session means more units wagered.
Suppose, as an example, you wager 10 units per spin and play 60 spins in an hour. Your total exposure is 600 units. If the house edge on the American wheel is higher than on the European wheel by a small fraction, that fraction is applied to all 600 units. The difference in expected loss between the two wheels grows with every spin you play. The player who wants to reduce expected loss can do two things: choose the wheel with fewer pockets, and reduce the number of spins they play per hour. Both changes reduce the total amount of money exposed to the edge.
Why Progression Systems Redistribute Outcomes Instead of Removing the Edge
A progression system is a betting pattern that changes the size of your wager based on previous outcomes. The most famous is the Martingale, where you double your bet after every loss and return to your base bet after a win. The idea is that a win eventually recovers all previous losses plus one unit of profit. The system feels logical because it works most of the time in the short run. But it does not change the house edge.
What a progression system does is redistribute outcomes. Instead of many small wins and many small losses, a progression system produces many small wins and occasional very large losses. The large loss occurs when a losing streak runs long enough that the next bet exceeds the table limit or the player's bankroll. At that point, the player cannot place the bet that would recover the losses, and the system collapses. The expected loss over the long run is identical to flat betting, because the house edge is applied to every wager regardless of its size.
On an American wheel, a progression system is even less attractive than on a European wheel. The higher house edge means the long-run expected loss per unit wagered is larger, so the occasional large loss arrives with a slightly higher probability. The system does not become worse in a way that changes its character; it remains a redistribution of outcomes with the same expected loss. No betting pattern changes the built-in edge of a negative-expectation game. The wheel's geometry is fixed, and the payout schedule is fixed, and no sequence of bet sizes alters either one.
What the Table Rules Tell You Before You Bet
Before you choose a wheel, read the table rules. The wheel type is usually printed on the layout or displayed on a sign at the table. A European wheel is sometimes called a single-zero wheel, and an American wheel is sometimes called a double-zero wheel. The presence of the double-zero pocket is the fastest way to identify an American layout. Some venues offer both wheel types on the same floor, and the choice between them is yours.
The table rules also state the minimum and maximum bet for each wager type, the payout schedule, and any special rules that apply. Some European tables offer a rule called "la partage" or "en prison," which changes what happens when the ball lands on zero for certain outside bets. These rules reduce the house edge on those specific bets, but they are not present on every table. If such a rule is offered, it is stated on the layout or in the table's posted rules. The wheel type and the special rules together determine the house edge for each bet.
The choice between European and American roulette is not a matter of taste. The European wheel has one fewer pocket, which means a lower house edge on every bet under the same rule set. The American wheel's double-zero pocket increases the expected loss per wager. If your goal is to minimise expected loss over a session, the European wheel is the better choice. If the American wheel is the only option available, the same principles apply: bet less per spin, play fewer spins, and understand that the edge is higher on every wager you place.
FAQ
Does the double zero on an American wheel change the payout for a straight-up bet?
No. A straight-up bet pays 35 to 1 on both wheel types. The difference is that the American wheel has 38 pockets instead of 37, so the same payout is spread across one more losing pocket. That is what raises the house edge on the American layout.
Can I switch between European and American wheels during the same session?
Yes, if the venue offers both wheel types. The house edge applies to each spin independently, so switching wheels does not change the mathematics of either wheel. Your expected loss for the session is the sum of the expected losses on each wheel, based on how much you wagered on each.
Is there any bet on an American wheel that has the same house edge as a European wheel?
No. The extra pocket on the American wheel increases the house edge on every bet that pays based on the number of pockets. The only exception would be a bet that pays out on the double zero itself, but that bet still carries the American wheel's structural disadvantage on all other outcomes.
Gambling involves risk. Please only gamble with funds that you can comfortably afford to lose. While we do our best to provide good advice, we cannot be held responsible for any loss that may occur as a result of gambling. We do our best to make sure all the information that we provide on this site is correct. However, from time to time, mistakes may occur. Before relying on any information that we provide, it is important that you check with the relevant operator. If you or someone you know is struggling with gambling addiction, please seek help from a professional organisation. The helpline printed in the footer below is a good starting point.
Play responsibly
Gambling should be treated as paid entertainment, never as a way to earn income or recover losses. 1-800-MY-RESET (1-800-697-3738)
18+ or 21+ depending on where you are; follow the minimum age that applies to you.
This article is general information about how these mechanics work. It is not legal advice and not a recommendation to gamble or to use any particular operator. Availability and legality differ by jurisdiction — check the rules that apply where you are.