Originally Answered: how often does the ball in the roulette wheel land on the number " Zero " ? One time in 37 spins for a single zero European wheel. One time in 38 spins for an American wheel with a double zero.

The early version of Rolette featured only a single zero, and it is still used in European casinos today and in some American Casinos. However when the game was shipped to the United States, the casino operators decided to add another zero to increase the Roulette odds in favor of the house.