European roulette is the single-zero version of roulette: 36 numbered pockets plus one green 0, for 37 pockets in total. That one structural detail matters more than the name, the felt design, or the language used by the dealer. Standard payouts are essentially the same as on double-zero roulette, but there is one fewer house-favoring pocket.
The result is a standard house edge of about 2.70% on ordinary European roulette bets. That is roughly half the 5.26% edge found on the common American 0-and-00 wheel. It does not make roulette a positive-expectation game, but it materially changes the long-run price of playing it.
What “European roulette” actually identifies
The label normally identifies the wheel format, not every rule at the table. A European wheel has the numbers 1 through 36 and a single zero. The layout may look familiar to anyone who has seen roulette before, with straight-up numbers in the main grid and outside bets for red/black, odd/even, high/low, dozens, and columns.
| Feature | Standard European roulette |
|---|---|
| Numbered pockets | 1–36 |
| Green pockets | 0 only |
| Total pockets | 37 |
| Straight-up payout | 35 to 1 |
| Split payout | 17 to 1 |
| Street payout | 11 to 1 |
| Corner payout | 8 to 1 |
| Six-line payout | 5 to 1 |
| Dozen/column payout | 2 to 1 |
| Even-money payout | 1 to 1 |
| Standard house edge | 2.7027% |
Those figures describe the core game. They do not guarantee special zero rules. A single-zero table may offer La Partage, En Prison, neither rule, or a casino-specific variation that must be read from the posted rules.
That distinction is also why European roulette and French roulette should not be treated as exact synonyms. French roulette is usually single-zero, but the traditional presentation may use French terminology, a different-looking betting layout, and special even-money treatment. The site’s French roulette rules guide covers those features separately.
Why one zero produces a 2.70% house edge
The cleanest way to see the mathematics is through a straight-up bet on one number.
A straight-up number wins on 1 of 37 possible pockets and pays 35 to 1. If you stake one unit and win, you earn 35 units of profit and receive your stake back. If any of the other 36 pockets lands, you lose the one-unit wager.
The expected value per unit is therefore:
EV = (1/37 × 35) + (36/37 × -1)
EV = -1/37 ≈ -0.027027
So the standard house edge is:
House edge = 1/37 = 2.7027%
The same basic disadvantage appears on the normal splits, streets, corners, six-lines, dozens, columns, and even-money bets. The reason is not that those bets have identical chances of winning. They do not. The reason is that their payout ratios are built around 36 numbered outcomes, while the green zero creates a 37th possible result that is not fully reflected in the payout.
For example, red covers 18 numbers. On an ordinary single-zero table, red wins on 18 pockets and loses on the other 19: the 18 black numbers plus zero. A one-unit red bet therefore has this expected value:
EV = (18/37 × 1) + (19/37 × -1) = -1/37
Again, the edge is 2.7027%.
The comparison with American roulette is not cosmetic
The familiar American wheel adds a second green pocket, 00, creating 38 total pockets. Standard American payouts generally remain the same. That extra losing outcome raises the ordinary house edge to:
2/38 = 5.2632%
The difference becomes easier to appreciate when expressed as expected cost rather than percentages.
Suppose a player makes $25 bets for 100 spins. Total action is $2,500.
| Wheel | Standard edge | Expected loss on $2,500 of action |
|---|---|---|
| European single zero | 2.7027% | about $67.57 |
| American double zero | 5.2632% | about $131.58 |
These are long-run averages, not predictions for a particular night. The player could win hundreds of dollars, lose far more than the expectation, or finish close to even. House edge describes the average mathematical cost over a very large amount of play. It does not smooth out short sessions.
The practical lesson is simple: if two otherwise comparable tables offer the same minimum, similar speed, and the same ordinary rules, the single-zero table is mathematically cheaper.
Zero rules can make some European tables cheaper still
The standard 2.70% figure assumes that zero simply loses an even-money wager. Some single-zero games treat those wagers differently.
Under La Partage, a qualifying even-money bet typically loses only half its stake when zero appears. Because the only structural loss beyond the 18 opposing numbers is now half a unit on zero, the edge becomes approximately:
0.5/37 = 1.35135%
That reduced edge applies to the qualifying even-money wagers under the stated rule. It does not turn a straight-up number or a dozen into a 1.35% bet.
En Prison handles zero differently. Instead of immediately settling the entire even-money wager, the stake may be held “in prison” for a later spin under the table’s procedure. Depending on the exact rule, this can also reduce the effective disadvantage on those wagers. Because implementations vary, the correct habit is to read the table rule rather than assume that the words European roulette automatically include En Prison.
The felt and the wheel describe two different kinds of adjacency
Roulette uses two maps at once. The betting layout arranges the numbers in a rectangular grid so players can place straight-ups, splits, streets, corners, and other wagers. The wheel arranges the same numbers in a physical sequence that is deliberately not numerical.
That matters whenever someone talks about “neighboring numbers.” A number can be adjacent to another on the felt without being beside it on the wheel. Conversely, sectors used in racetrack-style betting are based on the physical wheel sequence, not the rectangular grid.
This difference does not change the underlying probability of a fair spin. Grouping numbers because they sit near one another on the wheel is a way to define a set of bets, not evidence that those pockets are more likely to land next.
Single zero does not make streaks more meaningful
Because European roulette has a lower edge than American roulette, players sometimes attach extra strategic meaning to patterns on the display board. The lower edge does not make previous spins predictive.
If red has appeared six times in a row, black is not “due.” If 17 has not appeared all evening, the wheel does not owe the table a 17. On a fair wheel, each spin begins with the same physical set of 37 pockets. Previous results are useful for recording history, not for changing the probability of the next independent spin.
This is where the distinction between price and prediction is important. Choosing a lower-house-edge wheel is a rational cost decision. Believing that a lower-edge wheel makes patterns forecastable is a different claim and does not follow from the mathematics.
What to check before sitting down
A player does not need to memorize every roulette term to compare tables intelligently. Five checks usually reveal most of what matters:
- Count the green pockets. One zero is the defining feature of European roulette; 0 and 00 identify the common American format.
- Read the minimum and maximum limits. A lower edge can still cost more money per hour if the only single-zero table forces much larger bets than the alternative.
- Look for special zero treatment. La Partage or En Prison can improve qualifying even-money bets, but only when the rule is actually offered.
- Check unusual side bets separately. The 2.70% figure describes the standard roulette bet set, not every proprietary side wager a casino may place beside it.
- Consider pace as well as edge. Faster play creates more total action per hour. Expected cost depends on both the house edge and how much money is actually wagered.
Expected loss can be summarized as:
Expected loss = total amount wagered × house edge
A player betting $10 for 60 spins creates $600 of action. At the standard European edge, the theoretical loss is about:
$600 × 0.027027 ≈ $16.22
Again, that number is an average cost, not a promised session result.
Where European roulette fits in the roulette family
European roulette is best understood as the single-zero baseline. It uses the familiar roulette payout structure but removes the second green pocket that makes double-zero roulette more expensive. French rules can improve selected even-money bets further, while American roulette adds 00 and raises the standard edge.
If the goal is simply to understand the game, start with the main roulette guide. If the goal is to compare versions, the American roulette glossary entry shows what changes when 00 is added. And if a table advertises special zero treatment, read the separate La Partage or En Prison rule before assuming how a zero will be settled.
The defining fact remains straightforward: European roulette has 37 pockets, one zero, standard roulette payouts, and a standard house edge of about 2.70%. Everything beyond that—table limits, special rules, side bets, wheel speed, and presentation—has to be checked at the actual game.