- Maths reviewed by Josh Miller
- Tested by Diana Westfield
A single number on a European wheel is a 1 in 37 shot that pays 35 to 1. That gap, one number short of fair, is the 2.70% house edge, and it’s the same on almost every bet. The CasinoCalcs roulette odds chart below lists them all, and the calculator above adds the part a chart can’t: your chance of winning at least once in 100 spins and how much those spins cost on average. It’s free and covers European, French and American wheels.
Roulette odds chart: European and American
The odds of winning at roulette depend on the bet: 1 in 37 for a single number on a European wheel, 18 in 37 (48.6%) for red or black. Every bet carries the same 2.7% house edge on that wheel. A printable version is on the roulette cheat sheet.
| Bet | Numbers | Pays | European chance | American chance |
|---|---|---|---|---|
| Straight up | 1 | 35 to 1 | 2.70% | 2.63% |
| Split | 2 | 17 to 1 | 5.41% | 5.26% |
| Street | 3 | 11 to 1 | 8.11% | 7.89% |
| Corner | 4 | 8 to 1 | 10.81% | 10.53% |
| Top line (0, 00, 1, 2, 3) | 5 | 6 to 1 | n/a | 13.16% |
| Six line | 6 | 5 to 1 | 16.22% | 15.79% |
| Dozen or column | 12 | 2 to 1 | 32.43% | 31.58% |
| Red/black, odd/even, 1-18/19-36 | 18 | 1 to 1 | 48.65% | 47.37% |
House edge by wheel
The payouts are built so every bet loses the same share on average:
- European: 2.70% on every bet
- French with La Partage: 1.35% on even-money bets, 2.70% on the rest
- American: 5.26% on every bet, 7.89% on the top line
So £10 a spin for 100 spins costs about £27 on average on a European wheel and £53 on an American one. Picking the wheel matters far more than picking the bet.
Odds over a session
Over 100 spins, a single number comes up at least once 93.5% of the time and 2.7 times on average. Red comes up at least once almost every time. None of it changes the edge: the calculator’s expected loss line is the honest summary. To see the swings spin by spin, try the roulette simulator, and for the layout of the wheel itself, the roulette wheel chart. Systems don’t beat the chart either, as the Martingale calculator shows.
Learning to pay picture bets? Practise them in the dealer payout trainer.
Every roulette bet has a built-in edge against you. Set a budget per session. BeGambleAware.org is free and confidential if it stops being fun.