Roulette Odds and Payout Calculator
Choose a wheel, a bet and your stake to check the chance of winning and what the bet would return. The calculator separates your net profit from the total return including your stake, so a 35:1 payout does not get confused with 36 units coming back.
Single zero: 37 pockets. Double zero: 38 pockets. Standard payouts, with stakes in units. Each calculation covers one bet on one spin.
Roulette Odds and Payout Calculator
Choose a wheel, bet and stake to see the odds and what a win or loss returns.
Standard payouts. No special zero rules.
Enable JavaScript to change the inputs. The result below uses the displayed settings.
Your result
Pays 35:1
Single zero. Straight. Stake: 1 unit.
One selected number. A straight bet on 0, or on 00 when available, has the same odds.
A zero stake does not place a bet. The odds shown describe the selected bet type.
- Probability of winning
- 2.7027%1 of 37 pockets
- Net profit on a win
- 35 unitsProfit only, not the returned stake.
- Total return on a win
- 36 unitsProfit plus your returned stake.
- Loss on a losing bet
- -1 unitThe full stake is lost. Nothing is returned.
- House edge
- 2.7027%The mathematical advantage of the game.
- Expected average loss per bet
- 0.02702703 unitsStake multiplied by the house edge.
Expected loss is a long-run mathematical average, not a prediction of the next result. Any one bet can win or lose. Changing the stake does not change the odds or house edge.
Rules and calculation
This calculator uses standard payouts and equally likely pockets: 1 to 36 plus 0 for single zero, with 00 added for double zero. It calculates one bet, not a combination of bets.
Zero pockets lose on red, black, odd, even, low, high, dozen and column bets. There is no half return, la partage, en prison or other special zero rule. Multiplier roulette and the five-number basket bet are not included.
Winning probability = numbers covered / wheel pockets. Net profit = stake × payout. Total return = stake + net profit. House edge = 1 − [winning probability × (payout + 1)]. Expected average loss = stake × house edge.
Results are calculated directly, without simulated spins. Percentages are rounded to four decimal places and average loss to eight. Profit, return and losing stake retain the precision of your input.
Enter the full stake on the selected bet. A 2.5-unit split means 2.5 units across its two numbers, not 2.5 on each. Special zero rules, multiplier payouts, triple zero and the five-number basket bet are not included.
Roulette payout and probability table
The payout tells you the profit on a winning bet. The probability tells you how often that bet wins in the mathematical model. Covering more numbers raises the chance of a win, but lowers what each winning unit pays.
| Bet | Payout | Single zero37 pockets | Double zero38 pockets |
|---|---|---|---|
| Straight1 number | 35:1 | 2.70%1/37 | 2.63%1/38 |
| Split2 numbers | 17:1 | 5.41%2/37 | 5.26%2/38 |
| Street3 numbers | 11:1 | 8.11%3/37 | 7.89%3/38 |
| Corner4 numbers | 8:1 | 10.81%4/37 | 10.53%4/38 |
| Six line6 numbers | 5:1 | 16.22%6/37 | 15.79%6/38 |
| Dozen12 numbers | 2:1 | 32.43%12/37 | 31.58%12/38 |
| Column12 numbers | 2:1 | 32.43%12/37 | 31.58%12/38 |
| Red / black18 numbers | 1:1 | 48.65%18/37 | 47.37%18/38 |
| Odd / even18 numbers | 1:1 | 48.65%18/37 | 47.37%18/38 |
| Low / high18 numbers | 1:1 | 48.65%18/37 | 47.37%18/38 |
Percentages are rounded to two decimal places. Low means 1 to 18 and high means 19 to 36. Under these rules, 0 and 00 lose on red/black, odd/even, low/high, dozen and column bets. Each losing bet loses its full stake.
Payout reference: standard roulette payout rules. The winning chances above are calculated as covered pockets divided by total pockets.
What a 2.5-unit bet returns
The stake is the same in all three examples. Chip placement changes the numbers covered and the payout. These winning amounts are the same on either supported wheel; the probability of getting them is not.
Straight on 17
- Profit if it wins
- 87.5 units
- Total returned
- 90 units
Only 17 wins. The 87.5 units are profit; the other 2.5 units are your original stake.
Split on 17 and 20
- Profit if it wins
- 42.5 units
- Total returned
- 45 units
Either 17 or 20 wins. You stake 2.5 units on the split, not 2.5 on each number.
Corner on four numbers
- Profit if it wins
- 20 units
- Total returned
- 22.5 units
Any of 17, 18, 20 or 21 wins. The 22.5-unit return includes the 2.5-unit stake.
A winning bet can still leave the spin down
Suppose you put 10 units on 17 and 1 unit on red. That is 11 units staked. If red 9 lands, only the red bet wins and returns 2 units. Your overall result is a 9-unit loss, despite one winning bet.
For several bets, work out all winning returns minus the entire amount staked. The calculator above handles one bet at a time, not a combined layout.
Why the wheel changes your odds
Double zero adds one more pocket without increasing the standard payouts. There are still only 18 red pockets, 12 numbers in a dozen and one winning pocket for a straight bet. That extra outcome increases the house edge.
Single zero
2.70%
House edge, standard rules
A 10-unit bet has an expected loss of about 0.2703 units.
Double zero
5.26%
House edge, standard rules
A 10-unit bet has an expected loss of about 0.5263 units.
Every supported bet has the same house edge on the same wheel under these rules. A straight bet and red have very different chances of winning, but neither has a lower expected loss per unit staked.
Expected loss is not a session prediction. Placing 100 bets of 10 units means 1,000 units wagered. The expected loss is about 27.03 units on single zero or 52.63 on double zero. An actual set of 100 spins can finish well above or below those figures.
Probability and house-edge reference: Wizard of Odds roulette analysis. Figures here exclude all special zero rules and the five-number basket bet.
How the results are calculated
The calculation assumes an equally likely result for every pocket and independent spins. It uses the exact pocket count and standard payout, rather than estimating the answer from a run of simulated spins.
- Winning probability
- Covered pockets ÷ total pockets.
- Profit on a win
- Stake × payout multiplier. For 35:1, the multiplier is 35.
- Total return on a win
- Stake × (payout multiplier + 1).
- Loss on a losing bet
- The full stake. The net change is minus that amount.
- House edge
- 1 − [winning probability × (payout multiplier + 1)]. Use probability as a fraction or decimal, then multiply the result by 100 for a percentage.
- Expected loss per bet
- Stake × house edge, with the house edge expressed as a decimal.
For example, a single-zero straight bet returns 36 times the stake when it wins, but wins on only 1 of 37 equally likely pockets. The expected return is 36/37 of the amount staked, leaving an expected loss of 1/37. That is about 2.70%.
Roulette calculator questions
Does a 35:1 payout include my original stake?
No. A standard 35:1 payout means 35 units of profit for every unit staked, with the winning stake returned separately. A 1-unit straight bet therefore returns 36 units in total. A losing bet returns nothing.
Why is red not a 50/50 bet?
There are 18 red pockets, but the wheel has 37 or 38 pockets altogether. That gives red a 48.65% chance on single zero or 47.37% on double zero. Zero and double zero do not count as red or black.
Does a larger stake improve the winning probability?
No. Increasing the stake on the same bet increases the amount you can win or lose, but does not add winning pockets. The house edge also stays the same; the expected loss in units grows with the stake.
Can I calculate a whole betting layout at once?
This calculator handles one bet at a time. For several bets on the same spin, add the returns from all winning bets and subtract the total amount staked. Do not enter the combined stake under one bet type unless the whole amount is actually on that bet.
Does the calculator work for live roulette?
Yes, when the table uses the same pocket count, standard payouts and full loss on uncovered outcomes. Check its rules first. Multiplier games, special zero rules such as la partage or en prison, and altered payouts need different calculations.
Can the calculator predict the next spin?
No. It calculates the probability and payout for the bet you select. Under the independent-spin assumption used here, previous results do not change the next spin’s probabilities. A betting sequence cannot make those probabilities more favorable.