Roulette Simulator
Test Martingale, Paroli, D'Alembert, Fibonacci or flat betting on a fair virtual wheel. Watch your bankroll spin by spin, then run 1,000 sessions to see how the strategy really performs.
Bankroll over the session
Press "Run one session" to start.
1,000 sessions with these settings
Playing for real? Track it.
RIM PRO logs every real spin, keeps your betting consistent, and shows your actual balance per session and casino, with a prompt to stop when you're ahead.
The strategies explained
- Flat betting
- The same bet every spin. The simplest way to see the house edge at work.
- Martingale
- Double the bet after every loss, return to the base bet after a win. Many small wins, and the occasional loss large enough to wipe them out, especially once the table maximum stops the doubling.
- D'Alembert
- Add one unit after a loss, remove one after a win. Gentler swings than Martingale, same expected loss.
- Fibonacci
- Move one step up the sequence 1, 1, 2, 3, 5, 8… after a loss and two steps back after a win.
- Paroli (reverse Martingale)
- Double after a win and go back to the base bet after a loss or after three wins in a row. Small, frequent losses and occasional bigger wins: the mirror image of Martingale.
- Single number
- Pays 35 to 1 but hits only about once every 37 spins, so the bankroll swings hard.
Frequently asked questions
Does the Martingale strategy work?
It wins small amounts often but loses large amounts occasionally. A losing streak quickly hits the table limit or your bankroll, and over many sessions you lose on average. Run 1,000 sessions above to see it, or read our 100,000-session analysis.
What is the house edge?
2.70% on European (single-zero) roulette and 5.26% on American (double-zero). On average you lose that share of every euro you bet, whatever the strategy. See European vs American roulette odds.
Can any betting strategy beat roulette?
No. Every spin is independent and bet sizing doesn't change the odds of each bet. Strategies change how wins and losses are spread out, not the expected loss. See six systems compared over 100,000 sessions.
Is this simulator free?
Yes. It runs entirely in your browser with no signup and no real money.
This simulator is for education and entertainment. Gambling involves risk; only play with money you can afford to lose. 18+.