Roulette Wheel

Roulette Wheel is the device used to come up with random results in the gambling game of Roulette. The device is a large spinning wheel with tilting sides and numbered pockets. Once players have placed their bets on the Roulette Table, a croupier (dealer) spins the wheel. The wheel spins in one direction and the croupier shoots a ball in the opposite direction. Where the ball lands shows the result of this round.


Live online Roulette uses an actual physical wheel, whereas simulated Roulette uses a random number generator. Comparing these two most players prefer “real” games even when playing online.

As seen on

Roulette Wheel Numbers

Roulette Wheel has the numbers 0-36 in three colors: green, red and black. Zero is Green. Half of the numbers 1-36 are Red and half are Black.

Red numbers of the Roulette Wheel are: 1, 3, 5, 7, 9, 12, 14, 16, 18, 19, 21, 23, 25, 27, 30, 32, 34 and 36.

Black numbers of the Roulette Wheel are: 2, 4, 6, 8, 10, 11, 13, 15, 17, 20, 22, 24, 26, 28, 29, 31, 33 and 35.

Green number of the Roulette Wheel is zero. European Roulette only has one green zero. American Roulette also has a green double zero (00). Some online Roulette games also have triple zeros (000).

The sum of all the Red numbers is 332 and Black 334. Summed up, all the numbers of the wheel are 666. This gives Roulette its nickname “the devil’s game”.

European Roulette Wheel

European Roulette Wheel has one Zero (0) and a total of 37 different numbers. Image from Wikipedia

How It Works

Mechanical Wheel (in a real life brick-and-mortar casino) is made of wood and metal. The wheel rests on precision bearings, carefully selected to keep the spin results random (non-biased). The ball, originally made of ivory, is nowadays a special formulation of plastic. The construction of a wheel is an extremely detailed process, as any imperfection would lead to the results being not random enough. Only a few companies make Roulette wheels for top-end casinos, among them TCS John Huxley whose tables are often seen at live online casinos too.

Virtual Roulette Wheels are simply coded like any online game, but a lot of work goes towards the game’s random number generator. This piece of coding ensures that the spin results are random. These RNGs are nowadays verified by special testing laboratories, where millions (or even billions) of results are drawn and then analyzed to ensure that the Wheel’s results are random. Game providers like Microgaming and Netent provide simulated games to online casinos.


Typical Roulette Wheel odds for getting a winning number on a European Roulette game are:

  • Red: 48.6% (18 out of 37 numbers)
  • Black: 48.6% (18 out of 37 numbers)
  • Odds: 48.6% (18 out of 37 numbers)
  • Even: 48.6% (18 out of 37 numbers)
  • Low (Manque): 48.6% (18 out of 37 numbers)
  • High (Passe): 48.6% (18 out of 37 numbers)
  • Zero: 2.7% (1 out of 37 numbers)
  • Street: 29.7% (3 out of 37 numbers)

The odds are slightly lower for double and triple zero games as there are 1-2 more non-winning numbers on the wheel.

How to Calculate Odds

First see how many numbers there are on the wheel. This is either 37 (European single zero game), 38 (two zeros) or 39 (three zeros). Then divide the number of winning results with how many numbers there are on the wheel.

For example, “first dozen” bet has 12 winning numbers. Therefore it’s odds in an American Roulette game with two zero fields (0 and 00) are: 12/38 = 0.31578 = 31.6%.

Wheel Strategy

Roulette is a game of luck and as such there are no working strategies for it. Casinos maintain the wheels daily, so they don’t favor any numbers over the others. Online casinos, on the other hand, use random number generators that are tested to being fully random and thus you can’t predict what number is going to come up next.

Try It Yourself

You can try simulated Roulette Wheels on a number of sites. You can, of course, choose any online casino and try playing Roulette for free. Roulette is the most popular table game at casinos, so you’ll find at least a dozen different games at each casino.

The other option is to visit, which features a great Roulette simulator you can play for free. You can play the simulator’s virtual game as long as you like and get yourself familiar with the ins and outs of Roulette Wheels. The game even keeps track of your results (if you so wish) so you can try to gamble yourself on the game’s highscore list!

Last updated: 2021/11/03