Roulette simulator
No betting system beats roulette. In 10,000 simulated sessions with a $1000 bankroll, Martingale finished 39.6% of sessions ahead but lost $282 per session on average, against $106 for flat betting. Try any system below with play money.
Checked 2026-11-07. Source: simulation results below.
19+ in most of Canada (18+ in Alberta, Manitoba and Quebec), 21+ in most US states. A calculator shows what a bet pays, not how likely it is to win. Free help: 1-800-GAMBLER (US), ConnexOntario 1-866-531-2600 (Ontario), 211 (Alberta). More help.
The full rules and every bet are in how to play roulette.
How to place a bet
- One number, for example 7: pick a chip value and tap 7 on the board. If 7 comes up you win 35 times your chips and keep the stake.
- Red or black, odd or even, 1–18 or 19–36: tap the box under the board. Pays 1 to 1.
- A dozen (1–12, 13–24, 25–36): tap 1st 12, 2nd 12 or 3rd 12 on the left. Pays 2 to 1.
- A column: tap the 2:1 box under the column. Pays 2 to 1.
- Several bets at once: tap as many spots as you like before you spin. Undo removes the last chip, Repeat puts the last bet back.
Splits, streets and corners are not on the simulator board (they are too small to tap on a phone); their payouts and odds are in the roulette payout calculator.
Betting systems compared
10,000 sessions per system: $1000 bankroll, $10 base bet on red, American wheel, up to 200 spins, $500 table maximum.
| System | Sessions ending up | Bankroll lost | Average result | Average wagered |
|---|---|---|---|---|
| Flat (same bet every spin) | 20.9% | 0.0% | −$106 | $2000 |
| Martingale (double after a loss) | 39.6% | 54.1% | −$282 | $5126 |
| D'Alembert (+1 unit after a loss, −1 after a win) | 29.3% | 64.8% | −$467 | $8839 |
| Fibonacci (next number after a loss, back two after a win) | 54.0% | 39.5% | −$238 | $4443 |
Fixed random seed, so the table is the same on every visit. The average loss is close to the house edge (5.26%) times the amount wagered for every system. Download: roulette-betting-systems.csv (free to use with a link to this page).
Why systems cannot win
expected loss = amount wagered × house edge
Each spin is independent: the wheel has no memory of the last ten reds. Martingale doubles after each loss so that one win recovers everything plus one base bet. It works until a losing streak meets the table maximum or the end of the bankroll: seven losses in a row from $10 already needs a $1,280 bet. Those rare disasters cost more than all the small wins.
Worked example: $10 on red, Martingale, 200 spins wagers about $5126 per session. 5.26% of that is $270, close to the simulated average loss of $282.
Odds for every bet are in the roulette payout calculator; the cost per hour of play is in the house edge calculator.
Questions
Does the Martingale system work in roulette?
No. It wins small amounts often and loses big amounts rarely. In our test of 10,000 sessions ($1000 bankroll, $10 base bet, $500 table maximum), Martingale ended 39.6% of sessions up but lost $282 on average, more than flat betting ($106) because it bets more.
Can any betting system beat roulette?
No. Every spin is independent and every bet carries the same house edge (5.26% on an American wheel, 2.70% on a European one). A system only changes the size and order of your bets, so the average loss stays the same share of what you wager.
What if I stop once I am $100 up?
With Martingale and a $1000 bankroll, 86.7% of sessions reached +$100 before going broke and 13.3% lost the whole bankroll. The many small wins do not cover the rare busts: the average session still ended −$47.
Is this simulator real money?
No. It uses play money and a random number generator with the real roulette odds. Nothing is deposited or paid out.