The difference is on the wheel
The main difference between European and American roulette is the number of green pockets. Both versions have numbers 1 through 36, with 18 red and 18 black pockets. European roulette has a single zero (0), for 37 pockets in total. American roulette adds a double zero (00), bringing the wheel to 38 pockets.
The number order on the wheel also differs between the versions. The basic aim is the same: bet on an outcome such as a number, a color, or a group of numbers before the ball comes to rest.
How the extra zero affects the odds
The additional zero matters mathematically because, on common bets, it adds an outcome that favors the house without adding a winning outcome for the player. For equivalent bets, the house edge is about 2.70% in European roulette and 5.26% in American roulette. The casino therefore has a greater mathematical advantage in the American version.
These percentages describe the long-run mathematical expectation, not the result of a particular spin or a prediction for an individual session. The 00 does not mean every bet has the same chance of winning; that probability depends on the type of bet.
What changes—and what does not
For a straight-up bet on a single number, the stated payout is 35 to 1 in both versions. The difference is that the payout is set against 37 possible wheel outcomes in European roulette and 38 in American roulette. The quoted payout does not remove the effect of the extra zero on the odds.
When comparing tables, check the wheel layout and confirm whether it has a single 0 or both 0 and 00. If a lower house edge is the priority between these two versions, European roulette is mathematically more favorable. That does not guarantee a profit, and choosing a table does not change the random nature of the outcomes.
A catalogue example and an informed choice
Bettbit’s indexed catalogue lists European Roulette.
When assessing either version, compare the table rules, the number of zeros, and the stated house edge; do not assume similarly named games have identical conditions. The central distinction is straightforward: European roulette has one zero and 37 pockets; American roulette has a zero and a double zero, making 38 pockets and a higher house edge.