Guide hub
Roulette Guides: Odds, House Edge and What Our Simulations Show
Roulette is a pure luck game with a fixed house edge that depends on how many zeros the wheel has. These guides show the exact odds and what our simulations reveal about systems, stop-losses and wheel choice.
| House edge, single zero (37 pockets) | 2.70% |
|---|---|
| House edge, double zero (38 pockets) | 5.26% (five-number bet 7.89%) |
| House edge, triple zero (39 pockets) | 7.69% |
| Average loss, 1,000 x 1 USDT on red | 27 / 53 / 77 USDT by wheel |
| Betting systems tested | Flat, Martingale, D'Alembert, Fibonacci: none beat the edge |
All guides in this section
- GuideThe American Roulette Wheel: 38 Pockets, Table Layout and the Real Odds of Every BetHow the American roulette wheel and table layout work, the payout and house edge of every bet, and what 1,000 spins cost in our 100,000-player simulation.
- GuideRoulette Strategy Tested: Martingale, D'Alembert and Fibonacci vs Flat BettingWe ran 50,000 sessions each of Martingale, D'Alembert, Fibonacci and flat betting. See which roulette strategy hits its goal most, and why none beats it.
- GuideUS Gambling Laws and Roulette: Which States Allow Online Roulette in 2026US gambling laws for roulette explained: the seven states with legal online casinos, what UIGEA and Murphy v. NCAA cover, and how to check a state licence.
- GuideStop Loss Roulette: What Stop-Loss and Stop-Win Limits Really Do to Your ResultsStop loss roulette tested: five stop-loss and stop-win rules, 50,000 sessions each. See how often each rule ends ahead and why none of them beats the edge.
- GuideRoulette Risk Reward: Win Chance, Payout and Swing for Every Bet on Three WheelsRoulette risk reward for every bet on single, double and triple-zero wheels: win chances, green payouts, swings per spin and our 1,000-spin simulation.
Roulette is a game of pure chance: a ball lands in one of 37, 38 or 39 numbered pockets, and you bet on where it will stop. Every payout is set slightly below the true odds, and the gap is the house edge. On a single-zero wheel that gap is 2.70%; on an American double-zero wheel it is 5.26%, according to the Wizard of Odds roulette basics.
This hub collects our roulette guides. Each one is built on our own simulations, so you can see what the edge does to a real bankroll rather than take our word for it.
What roulette is and where the edge comes from
A roulette wheel has pockets numbered 1 to 36, half red and half black, plus one or more zero pockets. The game took its modern form in European casinos, and the single-zero wheel was introduced by the Blanc brothers at Bad Homburg in 1843, as Wikipedia's roulette history records.
Payouts are calculated as if the zeros didn't exist. A single number pays 35 to 1, which would be fair on a 36-pocket wheel. Add one zero and you have 37 pockets; add two and you have 38. The extra pockets are pure profit for the house.
house edge = zero pockets ÷ total pocketsSingle zero: 1 ÷ 37 = 2.70%. Double zero: 2 ÷ 38 = 5.26%. Triple zero: 3 ÷ 39 = 7.69%. This shortcut works for every standard bet.
The key numbers: three wheels, 1,000 spins each
We simulated 100,000 players per wheel, each betting 1 USDT on red for 1,000 spins. The table shows how the number of zeros changes the result.
| Wheel | Pockets | House edge | Expected loss (1,000 spins) | Median result | Players ahead after 1,000 spins |
|---|---|---|---|---|---|
| European (single zero) | 37 | 2.70% | 27.0 USDT | -28 USDT | 18.68% |
| American (double zero) | 38 | 5.26% | 52.6 USDT | -52 USDT | 4.35% |
| Triple zero | 39 | 7.69% | 76.9 USDT | -76 USDT | 0.69% |
The difference is large. On a single-zero wheel, 18.68% of players were still ahead after 1,000 spins. On the American wheel only 4.35% were, and on the triple-zero wheel 0.69%. Picking the wheel matters more than any betting system.
How to use our roulette guides
Start with the wheel, then the odds, then the strategy questions. Each guide links to the next.
- The American roulette wheel: the 38-pocket layout, the table, every bet with its payout and edge, and why the five-number bet is the worst on the table.
- Roulette risk and reward by bet type: win chances for every bet across all three wheels, what betting on green pays, and how much each bet swings your bankroll.
- Roulette strategy tested: our 50,000-session test of Flat, Martingale, D'Alembert and Fibonacci betting, and how many numbers each wheel really has.
- Stop-loss and stop-win rules: five session rules simulated side by side, and what limits can and can't do for you.
- US gambling laws and roulette: where online roulette is legal in the United States, what the federal laws cover, and how to check a licence.
What our betting-system test found
The most common roulette question is whether a system can win. We ran 50,000 sessions per system, each starting with 100 USDT and aiming to reach 150 USDT.
| System | Reached 150 USDT | Average result | Loss per 100 USDT wagered |
|---|---|---|---|
| Flat 1 USDT | 2.4% | -26.81 USDT | 2.71 USDT |
| Martingale | 48.7% | -6.46 USDT | 2.77 USDT |
| D'Alembert | 52.3% | -16.98 USDT | 2.84 USDT |
| Fibonacci | 48.5% | -12.43 USDT | 2.62 USDT |
Progressive systems hit the goal far more often than flat betting, but every one of them lost about 2.7 USDT for every 100 USDT bet. Britannica's article on roulette house odds reaches the same conclusion: no betting system overcomes the edge. The full breakdown is in our roulette strategy test.
Roulette with USDT and other crypto
Roulette's math is the same at a crypto casino as anywhere else; only the payment layer changes. A few points are specific to crypto:
- Use a stable bankroll. If your bankroll is in BTC or ETH, its price can move during a session, adding a second source of swings on top of the wheel. Our guide on why bitcoin is not a stablecoin explains the difference.
- Count network fees as part of the cost. On a small bankroll, a deposit and withdrawal fee can cost more than the house edge on a short session. The USDT and payments guides compare networks.
- Compare with crypto-native games. Many crypto games publish a lower edge than roulette. Our dice game guide shows a 1% edge game with an adjustable win chance, and the crash gambling guide tests auto-cashout targets the same way we test roulette systems.
Roulette's history is long, but its edge is simple: fewer zeros, lower cost. Everything else is about how you want the ride to feel.
Download all our roulette simulation data (CSV)
Browse our other datasets on the data and downloads page.
Frequently asked questions
Which roulette wheel has the best odds?
The single-zero (European) wheel. It has 37 pockets and a house edge of 2.70% on every standard bet. The American double-zero wheel has 38 pockets and a 5.26% edge, and triple-zero wheels have 39 pockets and a 7.69% edge. In our simulation of 1,000 spins on red, the single-zero wheel cost about half as much as the double-zero wheel.
Can any roulette strategy beat the house edge?
No. Every bet on a given wheel carries the same edge, and betting systems only rearrange when you win and lose. In our test of Flat, Martingale, D'Alembert and Fibonacci betting, every system lost between 2.6 and 2.9 USDT per 100 USDT wagered on a single-zero wheel, which matches the 2.70% edge.
Is roulette pure luck?
Yes. Each spin is independent, so past results tell you nothing about the next one. You choose which bet to make and how much to stake, which changes how bumpy your results are, but not the long-run cost. The only decision that lowers that cost is picking a wheel with fewer zeros.
How many numbers are on a roulette wheel?
A European wheel has 37 pockets: numbers 1 to 36 plus a single 0. An American wheel has 38: 1 to 36 plus 0 and 00. Triple-zero wheels add a third zero pocket for 39 in total. The extra zero pockets are where the house edge comes from.
Sources
- Roulette Basics — Wizard of Odds
- Roulette: House odds — Encyclopaedia Britannica
- Roulette — Wikipedia
- Doctrine of the maturity of the chances — Encyclopaedia Britannica