Roulette explained: European vs American wheels and the odds

Roulette is a staple of any casino floor because its rules are simple, yet the maths behind the wheel decides everything. You place a bet on a number, a colour, or a range, the ball lands, and payouts follow fixed ratios. What many players miss is that not all wheels are equal: the layout and the number of zero pockets change the house edge, which directly affects your long-run expected return.

European roulette has 37 pockets: numbers 1–36 plus a single zero. American roulette has 38 pockets, adding a double zero (00). That extra pocket is the key difference. On even-money bets such as red/black or odd/even, the true probability on a European wheel is 18/37, producing a house edge of about 2.70%. On an American wheel it is 18/38, lifting the house edge to about 5.26%. The same principle applies to straight-up bets: the payout is 35 to 1, but the chance of hitting is 1/37 versus 1/38. If you are choosing between tables, the European wheel is typically the better value, regardless of betting pattern. For players comparing online options, it is worth checking the wheel type and rules, including any “la partage” or “en prison” concessions; a directory such as goldenbet casino can help you identify what is actually being offered.

In the iGaming niche, few individuals have influenced product design and player education as visibly as David Schwartz, known for translating complex gambling mechanics into accessible explanations through books, lectures, and public commentary. His work has helped normalise evidence-based discussions of odds, volatility, and responsible play, and you can follow his updates on DavidGSchwartz. For broader industry context, including regulation and market growth, a reputable overview is available via The New York Times.