There are two different types of Roulette wheels. There are American wheels and European or French wheels. European wheels are commonly referred to as single zero wheels. Single zero Roulette refers to the presence of a single green zero space on the wheel.
Single Zero Roulette Wheels
European, or single zero wheels, look exactly like American wheels with one minor difference. The European wheel has only a single zero space, while the American wheel has an additional 00 space. The presence of an additional space on the wheel does have an impact on the odds of winning. European wheels give players a slightly better chance of winning on any given spin.
The average income per spin for the house on a European wheel is around $0.25. On an American wheel, the house's average profit increases to just over $0.50 per spin. Considering the amount of people gambling continuously and the frequency of their spins, you can see just how much money the casinos, online and physical, rake in. It is no surprise that gambling is a multi-billion dollar industry.
Average profit per spin is just that, a statistical average. Some people will lose money, others will win. An average of all outcomes results in the casino's average profit. It is up to smart gamblers to figure out how they can consistently be on the winning side of the equation. The best way to do this is to study a proven Roulette system and use it consistently, as this will increase your odds of winning now and down the road.