Roulette Simulator
Spin the wheel, track frequencies, hot and cold numbers.
Use this simulator to explore roulette outcomes, house edge, variance, and expected value over repeated spins. The simulation is educational and designed to show how probability behaves over time, it is not gambling advice.
Compare how Martingale, Fibonacci, D'Alembert, and flat betting perform over N spins on even-money bets (red/black). Uses European (18/37) win probability.
Frequently Asked Questions
What is the house edge in roulette? ▾
European roulette has a house edge of 2.70% (one zero pocket). American roulette has a house edge of 5.26% (two zero pockets). This means for every $100 wagered, the casino expects to keep $2.70 or $5.26 on average over many spins.
Does the Martingale system work in roulette? ▾
No betting system can overcome the house edge. The Martingale doubles bets after losses and produces frequent small wins, but eventually a losing streak hits the table limit and causes a catastrophic loss. The long-run expected value remains negative.
Is each roulette spin independent? ▾
Yes. Each spin is completely independent of all previous spins. The ball and wheel have no memory. A streak of 10 reds does not make black more likely on the next spin, this misconception is known as the Gambler's Fallacy.
What is the best bet in roulette? ▾
Even-money bets (red/black, odd/even, 1-18/19-36) on European roulette offer the best odds with a 48.65% chance of winning each spin. Avoid the five-number bet (0, 00, 1, 2, 3) in American roulette, it carries a 7.89% house edge.