How the Double Zero Changes the Game
The American roulette wheel contains 38 pockets in total. This includes numbers 1 through 36, a single green zero, and a double green zero. That extra green pocket might seem harmless, but it drastically alters the mathematical advantage of the casino. When you make a straight-up bet on a single number, the payout is 35 to 1. On a single-zero wheel, your true odds of winning are 1 in 37. On an American wheel, those odds drop to 1 in 38 because of the extra pocket. The payout remains the same, meaning you get paid less than the true mathematical risk you take.