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Main Roulette Bets and Their Winning Chances
The table below compares popular roulette wagers in single-zero and double-zero games. The same bet can have different chances because the wheel total changes.
| Bet | Odds (single zero version) | Odds (double zero version) | How to calculate (single zero) | How to calculate (double zero) |
|---|---|---|---|---|
| Straight up | 2.70% | 2.60% | 1:36 | 1:37 |
| Split | 5.40% | 5.30% | 2:35 | 2:36 |
| Street | 8.10% | 7.90% | 3:34 | 3:35 |
| Corner | 10.80% | 10.50% | 4:37 | 4:34 |
| Basket | - | 13.20% | - | 5:33 |
| Six Line | 16.20% | 15.80% | 6:31 | 6:32 |
| Column | 32.40% | 31.60% | 12:25 | 12:26 |
| Dozen | 32.40% | 31.60% | 12:25 | 12:26 |
| Even/Odd | 48.60% | 47.40% | 18:19 | 18:20 |
| Red/Black | 48.60% | 47.40% | 18:19 | 18:20 |
| High/Low | 48.60% | 47.40% | 18:19 | 18:20 |
Single-zero roulette gives the player slightly better maths because the wager is measured against 37 possible results instead of 38. The gap may look minor on one-number or two-number wagers, but it becomes clearer on wider bets such as red/black or high/low, where the difference can reach around 1.20%.
In simple terms:
- Probability explains how likely the wager is to win.
- Odds show how many results win compared with how many results lose.
How Roulette Probability and Odds Are Calculated
Roulette probability is found by checking how much of the wheel your wager covers. The more numbers included in the bet, the higher the chance of landing a winning result. The trade-off is simple: bets that cover more numbers usually pay less, while bets that cover fewer numbers usually pay more.
Here is a straight-up example:
- European roulette has 37 numbers, from 0 to 36.
- A straight-up wager covers just 1 number.
- The calculation is 1 / 37 x 100.
- The division 1 / 37 gives 0.0270.
- After multiplying by 100, the chance is 2.70%.
This means that one exact-number bet wins only when the ball lands on that chosen number. The remaining 36 numbers do not pay the bet, which is why the payout is higher than for wider bets.
For an even/odd wager, the covered area is much larger. It includes 18 numbers, so the calculation is:
- 48.64% to win = 18 / 37 x 100
This bet comes close to half the wheel, but it is not exactly 50%. The zero is not part of the even or odd group, so it keeps the winning chance slightly below half.
Odds use a ratio instead of a percentage. A dozen bet gives a clear example:
- European roulette has 37 numbers.
- A dozen wager covers 12 numbers.
- There are 25 losing numbers, because 37 - 12 = 25.
- The odds are 12:25.
This means the wager has 12 successful outcomes and 25 unsuccessful outcomes. If the same wager is played on a double-zero table, the calculation must use 38 total numbers instead. That extra number increases the losing side of the ratio and slightly lowers the probability.
Odds = Successful Outcomes Unsuccessful Outcomes x 100%
Successful Outcomes - the numbers included in your chosen wager
Unsuccessful Outcomes - the remaining wheel numbers that do not pay that wager
Probability = Numbers Included in the Bet All Numbers on the Wheel x 100
A single-zero wheel has 37 number positions
A double-zero wheel has 38 number positions
Probability for Multi-Bet Roulette Rounds
Players do not need to use only one wager type per spin. Several bets can be active at once. The important rule is to count each covered number once, even if more than one chip touches the same result.
A calculator can help if manual counting becomes annoying. Enter the bet type or the numbers included, and it will show the probability value.
Here is a mixed-bet example:
- A European roulette wheel has 37 possible results.
- One dozen wager already covers 12 of them.
- If a player adds five straight-up bets from the second dozen and three split bets in the third dozen, those extra bets add 5 and 6 covered numbers.
- So the full coverage is: 12 + 5 + 6 = 23 numbers
- Now divide the covered results by the full wheel: 23 / 37 = 0.6216
- After multiplying by 100, the winning probability becomes 62.16%.
The key point is to avoid double-counting. Extra chips do not always mean extra coverage. If a corner bet and a street bet sit inside an area already covered by a column wager, the total may still be only 12 covered numbers. In that case, the probability stays at 32.43%, calculated as 12 / 37 x 100, with odds of 12:25.
Wheel-Section Bets and Their Chances
Announced bets, also known as call bets or French bets, follow the wheel order instead of the usual table grid. They help players cover a selected wheel zone without placing every chip manually.
For example, Tiers du Cylindre covers 12 numbers on the side opposite zero. Jeu Zero targets the numbers closest to zero. Voisins du Zero covers the wider zero-side sector.
| Bet | Odds | Probabilities |
|---|---|---|
| Voisins du Zero | 17/20 | 45.95% |
| Orphelins | 8/29 | 21.62% |
| Le Tiers du Cylindre | 12/25 | 32.53% |
| Jeu Zero | 7/30 | 18.70% |
| Neighbours | 5/32 | 13.8% |
Check Roulette Probabilities Faster With Our Calculator
Roulette probability is easy once you know the formula, but complex bets can still take time. Our calculator does the counting for you. Choose the wager type, add the required details, and get the probability without doing the maths yourself.
FAQs
Outside bets are usually the easiest to hit. Red/black, even/odd, and high/low all cover 18 numbers and pay 1:1. They are popular because they land more often than inside bets, although zero keeps them below exactly 50%.
European roulette has one zero and 37 total results. The zero creates the casino’s advantage because most standard wagers do not include it. The house edge is calculated as 1 / 37 = 2.70%, so over time the casino expects to keep around RM2.70 from every RM100 wagered.
Zero is calculated in the same way as any straight-up number. On a European or French table, it is one result out of 37, so the chance is 2.70%. On an American table, one number out of 38 gives about 2.63%.
No. They do not affect the spin itself. The wheel does not become more likely to land on your chosen outcome. These rules only help when zero appears on even-money bets, because they reduce the amount lost or give the stake another chance.
RTP means Return to Player. It shows the expected return over many rounds. For example, a game with 97.30% RTP is expected to return about RM97.30 for every RM100 wagered in the long run. It is a long-term figure, not a session guarantee.
