A European wheel has 37 pockets: the numbers 1 to 36 and one green zero. Eighteen numbers are red, eighteen black, and the zero is neither. The numbers are not in order — they are arranged so that colours, odds and evens, and highs and lows alternate as much as possible.

Bets

You can bet inside the layout on specific numbers (straight up, split, corner) or outside on large groups — colour, odd/even, a dozen or a column. The trade-off is direct: the more numbers you cover, the more often you win, but the less you get.

Payouts

A straight-up number pays 35:1, a corner 8:1, a dozen 2:1 and a colour 1:1. Every payout is calculated as though the wheel had 36 numbers. It has 37 — and that gap is the casino’s profit, however you bet.

Strategies

Neither Martingale nor Fibonacci nor any other system changes the house edge. They only change the shape of the risk: plenty of small wins traded for one big loss that arrives at the worst moment. You can check that over thousands of simulated spins.

The full breakdown, with a live simulationRun thousands of spins and watch the return close relentlessly in on −2.70%.

Roulette academy

Want to go deeper?

Six articles covering roulette from the mechanics of the wheel to what goes on in a player’s head. No myths, no promises of guaranteed wins.

How roulette works

Understand the house edge.

How the numbers are laid out on the wheel, how each spin’s result comes about and why the maths is set in the casino’s favour.

Types of roulette bets

See what each bet really covers.

A catalogue of bets from straight-up numbers to even-money chances — what each covers, what it pays and how often it really lands.

Probability in roulette

Learn to work out what a bet earns you.

The real odds of every bet, payout ratios and expected value — the numbers that reveal what a single spin costs.

Bankroll management

Find out how long your money will last.

Bet size relative to your bankroll, how long losing streaks tend to run and the point at which the game turns against you.

How to win at roulette?

Get an honest answer, not a promise.

Why you can win on a given night, but not over thousands of spins. With a simulation that shows the difference in the data.

Player psychology

Spot the trap almost everyone falls into.

The gambler’s fallacy, chasing losses and other traps — why we bet against a streak and what that feeling ends up costing us.

All articles →

About the simulator

What a roulette simulator is

A roulette simulator is a faithful model of the real game. The wheel has the same pockets, the layout the same bets, and the payouts match what you would get at a real table — in all three variants: European, French and American. One difference matters: you play with virtual chips, so no mistake costs you a cent. There are no deposits, no withdrawals and no real-money winnings — by design, not by limitation.

Why play for free? Because roulette is a game where most mistakes are expensive and slow to teach. In the simulator you can get comfortable with the layout, try call bets on the racetrack, see what a run of ten losses actually looks like, and find out how many spins your bankroll really survives at your bet size. In one evening you get experience that would take months and a lot of money at a real table.

Everything runs straight in your browser — on desktop and mobile, with no sign-up and no install. If the maths behind the game starts to interest you after a few spins, the simulator leads on to the system tester, probability calculator and the whole academy.

FAQ

Quick, honest answers.

Is Roulette Sim Lab free?

Completely. Every tool runs on virtual chips only — no deposits, no payments and no paid "guaranteed systems", because no such thing exists.

Can I win real money?

No. Roulette Sim Lab is an educational and practice simulator. The virtual chips have no value and cannot be bought or cashed out. If you are looking for real-money gambling, this is deliberately not the place.

Do I have to register or download anything?

No. Everything runs straight in your browser, on desktop and mobile. Open it and play.

What is the difference between European, French and American roulette?

The number of zeros. European has one (a 2.70% house edge), French adds the La Partage rule (1.35% on even-money bets), and American has two (5.26%). If you have the choice, play European or French.

Can I test roulette strategies?

Yes — in the tester you can run Martingale, Fibonacci or your own rules over thousands of simulated spins and watch the bankroll curve, the drawdowns and the losing streaks.

Can any system beat roulette in the long run?

No. Systems change the pattern of wins and losses, but not the expected loss — that is set by the house edge. Why that is, we show honestly, with a simulation.

Are the spins genuinely random?

Yes. Every spin draws one of 37 numbers independently of all the others — the wheel has no memory. A long run of one colour therefore does not mean the other is "due". How common such runs actually are is something you can work out in the streak calculator.

Does the simulator work on mobile?

Yes. The simulator and all the other tools are responsive and run in a mobile browser with no install — just open the page.

Take your first spin.Free, right now.

The full table with every bet, live statistics and three wheel variants. No sign-up, virtual chips only.

Play roulette Test a system

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Play for fun and understanding, not for money.

Roulette Sim Lab uses virtual chips only — no deposits, no withdrawals, no winnings. It is an educational simulator intended for adults. If real-money play elsewhere stops being fun, confidential help is available — see responsible gaming.