Roulette Wheel
Spin the European roulette wheel. Place a bet, watch the ball fly, and see where luck lands you!
Colour Distribution
Theoretical: Red 48.6%, Black 48.6%, Green 2.7%
Your session
How to Play the Roulette Wheel
Select a bet type (Red, Black, Odd, Even, Low 1–18, High 19–36, or just 0), then click Spin. The SVG wheel accelerates and spins for several seconds before slowing to reveal the winning number. Your selected bet is automatically checked against the result. Visit the Chance Games hub to try all our interactive games.
The wheel uses European rules with numbers 0–36. Red and black cover 18 numbers each; 0 is green and is the "house advantage" number. For more randomness tools, explore our random number generators or the fun coin flipper.
Roulette Probability Explained
European roulette has 37 pockets (0–36). The house edge comes from the single green 0 - On red/black bets you win only 18/37 of the time (~48.6%), not 50%. The house edge on all even-money bets is 1/37 = 2.7%. American roulette adds 00, increasing the house edge to 5.26%.
The "Gambler's Fallacy" is the mistaken belief that past results influence future spins - They do not. Each spin is completely independent, just like our coin flip. For completely random picks without numbers, try our random name pickers.
Fun Facts About Roulette
- The sum of all roulette numbers (0–36) equals 666 - Earning it the "Devil's Wheel" nickname.
- Roulette was invented in 18th century France; Blaise Pascal accidentally contributed the wheel while trying to build a perpetual motion machine.
- The longest recorded streak of the same colour is 32 times in a row (red).
- A $200 "martingale" bet doubling strategy requires $25,600 after just 7 consecutive losses.
- Track your game sessions with our stopwatch or use the interval timer for timed casino nights.
Probability & Fairness
European roulette has 37 pockets numbered 0 through 36. Because of the single green 0 pocket, red and black bets each win only 18 out of 37 spins - A probability of 48.6%, not the intuitive 50%. This 1.4% gap below 50% is the source of the house edge of 2.7% on all even-money bets. American roulette adds a second green pocket (00), which reduces the player's odds further and raises the house edge to 5.26%. This simulator uses European rules, giving players the best theoretical odds.
Each spin of the wheel is completely independent of all previous spins. The belief that a number is "due" after a long absence - Or that a hot number will continue - Is known as the Gambler's Fallacy, a common misconception about how probability works in practice.
Use Cases for the Roulette Wheel
Beyond entertainment, roulette wheels serve practical purposes in educational settings. Teachers use them to demonstrate probability, expected value, and the concept of house edge in real-world terms. A roulette wheel is also an engaging classroom random selection tool - Spinning to choose which student answers a question or which group presents next adds an element of excitement to routine activities. For party and event organizers, spinning the wheel can make prize draws or group assignments more theatrical.
Frequently Asked Questions
Is this roulette wheel fair?
Yes. Each of the 37 pockets (numbers 0 through 36) has an equal 1/37 probability of being selected on every spin. The result is determined by the browser's Math.random() function, which is a statistically fair pseudo-random number generator.
What is the house edge in real roulette?
In European roulette (single zero), the house edge is 2.7% on all bets. This comes from the green 0 pocket, which means red/black bets win only 18 out of 37 spins rather than 18 out of 36. American roulette adds a second zero (00), raising the house edge to 5.26%.
Why is it not exactly 50/50 for red or black?
The wheel has 18 red pockets and 18 black pockets, but also 1 green pocket (the 0). This means a red or black bet wins only 18 out of 37 spins, or 48.6%, rather than a true 50%. The green 0 pocket is what creates the house edge.
Can I use this roulette wheel for classroom activities?
Yes. The roulette wheel is an excellent teaching tool for probability and expected value lessons. Teachers use it to demonstrate how a small deviation from 50% (the green 0) creates a significant house advantage over many spins - A real-world application of probability theory.