This roulette simulator shows how a chosen bet is settled after a random wheel result. It uses virtual credits and cannot accept or pay money. Start with one bet type, read its coverage, and compare the result with the number shown. The wheel animation illustrates the outcome; it is not a physical prediction system.
Roulette simulator: choose the wheel first
European roulette has the numbers 1 through 36 plus a single zero, giving 37 possible outcomes. American roulette adds double zero for 38. This simulator treats each pocket as equally likely. Changing the wheel changes probability even when the printed payout stays the same.
Zero is green. It is outside red and black, outside odd and even bets, and outside the low and high ranges. Double zero has the same role on an American wheel. The standard full-loss zero settlement is used here. Special half-loss or held-bet rules are not modeled.
Match coverage to the payout
| Bet | Covered numbers | Profit on a win |
|---|---|---|
| One number | 1 | 35 times stake |
| Red or black | 18 | 1 times stake |
| Odd or even | 18 | 1 times stake |
| Low or high | 18 | 1 times stake |
| A dozen | 12 | 2 times stake |
The payout is profit, not the full amount returned. A winning one-credit straight bet earns 35 credits and returns its one-credit stake too. A losing bet returns nothing. Covering more pockets usually makes wins more frequent while reducing the profit per winning stake. Frequency alone does not measure expected return.
This table explains common choices. The tool exposes the choices shown in its controls rather than every possible physical table placement. Do not assume that a missing split or corner is selectable through the one-number field.
Work through red and a single number
On a European wheel, red wins on 18 of 37 pockets. Black accounts for another 18, and zero accounts for one. Red therefore wins about 48.65% of individual spins. A single chosen number wins on 1 of 37, about 2.70%. Neither figure describes what must occur during the next small batch of spins.
Imagine a 10-credit red bet followed by zero. The result is a loss of 10 credits, even though zero is mathematically an even integer. Roulette uses its own bet definitions. If the next spin lands on a red pocket, a fresh 10-credit red bet earns 10 credits. The new spin does not refund the earlier loss.
Use history to check settlement, not forecast
A result list can help you inspect whether a zero, color, or dozen was settled correctly. It cannot make a number due. In the independent-spin model, five black results leave the next red probability unchanged. Doubling a virtual stake after each loss changes how sharply the balance can move; it does not change the pockets.
For a useful experiment, keep the wheel and stake fixed while reading each result. Then switch only the wheel and compare the theoretical figures in the roulette odds calculator. An observed short sample can differ substantially from those figures. Avoid treating that difference as evidence of a hidden trend.
The demonstration does not copy a commercial operator, connect to a live wheel, model wheel defects, or certify random-number systems. It is an educational interface for the explicitly stated uniform model.
Common questions
Is zero even in roulette?
Zero does not qualify for an even bet. It is a separate green pocket.
Can earlier spins identify the next result?
Not in this simulator. Spins use the same uniform model independently.
Does American roulette have the same odds?
No. Its extra double-zero pocket changes the probability of common bets.