The roulette wheel: how does it work?

The roulette wheel is the main part of the game, the place where the ball spins and where the winning number is decided. If you understand how it is built and how it turns, you will play more relaxed and follow what happens in every round more easily, because everything starts from it. We will show you what the wheel looks like, how the numbers are laid out on it and what makes it work correctly every time.

What is the roulette wheel?

The roulette wheel is a spinning wheel on which the ball comes to rest, setting the winning number of each round, and it is divided into several numbered pockets coloured red, black and green.

Everything that happens on the table is tied to this wheel, because you bet on where you think the ball will stop, and it is the wheel that produces the result. We always tell players who are starting out that if they understand the wheel, they have already understood half the game, the rest coming down to the types of bets they can place, and those are easy to pick up at any table in an authorised online casino.

How are the numbers laid out on the wheel?

The roulette numbers are not placed on the wheel at random. They follow a carefully thought out order, whose role is to balance red against black and high numbers against low ones across the whole surface.

• The numbers run from 0 to 36, and the American version also has a 00.
• Red and black alternate, so that no two pockets of the same colour sit next to each other.
• High and low numbers are spread out evenly rather than grouped together.
• Numbers opposite each other on the wheel complement one another, often adding up to similar values.

This order does not affect your chances, the ball falls at random anyway, but it shows how carefully the wheel was designed to be balanced both visually and mathematically.

The European and the American wheel

Although they look the same at first glance, there are 2 main versions of the wheel, and the difference between them matters more to your chances of winning than you might think.

The main differences are:

• The European wheel has 37 pockets, the numbers from 0 to 36.
• The American wheel has 38 pockets, because it also includes a 00.
• On the European version, the house edge is smaller, around 2.7%.
• On the American version, the house edge rises to almost 5.3%, precisely because of the extra pocket.

In short, the European wheel gives you slightly better chances, which is why we always recommend that players choose it when they have the option, because the difference, small as it looks, adds up over the long run.

How the winning number is decided

The mechanism behind the game is simple to understand, even if it looks spectacular, and it rests on a few steps that repeat in every round. A normal round goes like this:

1. The players place their bets on the table.
2. The dealer, or the system in the online version, spins the wheel in one direction.
3. The ball is launched in the opposite direction to the wheel's rotation.
4. As the wheel slows down, the ball drops and settles in one of the pockets.
5. The number and colour of that pocket determine the result of the round.

At online roulette, this process is controlled by a random number generator, a system that makes sure every result is completely random, exactly as on a physical wheel, and if you want to see how it all connects to the bets, you will find the explanations in the guide on how to play roulette online.

The role of the zero pocket

The zero pocket, coloured green, plays a special role on the wheel and is in fact the reason the casino always keeps a small edge, whatever way you bet.

Zero does not belong to the usual categories people bet on, such as red or black, odd or even, so when the ball stops on green, these simple bets lose, and on the American version, with 2 green pockets, this house edge is bigger still.

That is exactly why having a single zero pocket, as European roulette does, works out better for you, a point you can tie directly to the types of bets covered in the guide on roulette odds and bets.

Myths about the roulette wheel

Plenty of mistaken ideas circulate around the roulette wheel, and some of them can confuse less experienced players, so let us clear them up.

• That the wheel has "hot numbers" which come up more often, which is false, because every spin is independent.
• That you can predict where the ball will fall by following previous results, which is impossible on a fair wheel.
• That the dealer can control where the ball stops, which does not happen at regulated tables.

The truth is simple: the roulette wheel works completely at random, and every round starts from scratch, with no connection to what came before, which is why no system based on past results can possibly work.

Play responsibly

Roulette is a popular game precisely because of its pace and the variety of bets, but we always recommend treating it as a form of entertainment rather than a way to make money.

In Moldova, gambling is organised under the state monopoly of the National Lottery of Moldova, and Slot.md is the only legal online casino on the local market, which gives you the assurance that you are playing within a fair and regulated framework.

The minimum age for casino games, roulette included, is 21, and every game and every offer is addressed exclusively to people who have reached this age.

Frequently asked questions

1. How many numbers does a roulette wheel have?

The European wheel has 37 numbers, from 0 to 36, while the American one has 38, because it also includes a 00. The rest of the numbers are coloured red and black, and zero is green.

2. Why does American roulette offer worse chances?

Because it has an extra pocket, the 00, which raises the house edge to almost 5.3% against 2.7% on the European version. That is why European roulette is more favourable for players.

3. Can you predict where the ball will stop?

No. The roulette wheel works completely at random, and every spin is independent. No system based on previous results can predict where the ball will fall.

4. Why are the numbers not in order on the wheel?

The numbers are laid out deliberately, to balance red against black and high numbers against low ones across the whole wheel. This order does not change your chances, but it does make the wheel balanced.

5. What role does zero play at roulette?

Zero is the green pocket that gives the casino its edge. When the ball lands on zero, simple bets such as red/black or odd/even lose, which tips the balance slightly in the casino's favour.