Roulette 101: American vs. European Wheels and What the Odds Really Mean
Roulette is the easiest casino game to learn and one of the easiest to play badly. The single most important decision happens before you place a chip.
By Dana Reyes, Games editor · Published Apr 16, 2026 · Updated Aug 2, 2026 · 6 min read
Roulette odds are fixed, published, and unusually easy to verify. A ball lands in a numbered pocket, and every wager on the layout pays a set amount. The complication is that there are two common wheels, and they are not equally good for the player.
This guide explains the difference, lists what each wager pays, and clears up why wagering systems cannot change any of it.
Two wheels, one important difference
A European wheel has 37 pockets: numbers 1 to 36 plus a single zero. An American wheel has 38: the same numbers plus both a zero and a double zero. The payouts are identical on both wheels.
That extra pocket is the whole story. On a European wheel the house edge on nearly every wager is about 2.7%. On an American wheel it is about 5.26% — roughly double, for exactly the same game. If both are available, the single-zero wheel is the better choice every time.
What each wager pays
Notice the pattern: a straight-up wager pays 35 to 1 but there are 37 or 38 possible results. The gap between the true odds and the payout is the house edge, and it is built into every wager on the layout in the same proportion.
| Wager | Covers | Pays |
|---|---|---|
| Straight up | One number | 35 to 1 |
| Split | Two adjacent numbers | 17 to 1 |
| Street | Three numbers in a row | 11 to 1 |
| Corner | Four numbers | 8 to 1 |
| Dozen or column | Twelve numbers | 2 to 1 |
| Red/black, odd/even, high/low | Eighteen numbers | 1 to 1 |
Inside wagers and outside wagers
Inside wagers cover few numbers and pay a lot; outside wagers cover many numbers and pay a little. Neither is mathematically better — they have the same expected return on the same wheel. What changes is variance: inside wagers produce rare large swings, outside wagers produce frequent small ones.
The rules that improve your odds
- La partage: on a single-zero wheel, even-money wagers lose only half their stake when zero hits, cutting the edge to about 1.35%.
- En prison: your even-money wager is held for the next spin instead of lost, with a similar effect.
- These rules are table-specific and always signposted — they are the only legitimate way to improve roulette odds.
Why wagering systems do not work
The Martingale — doubling after every loss — feels bulletproof and is not. It requires an unlimited bankroll and a table with no maximum wager, and neither exists. What the system really does is trade many small wins for an occasional catastrophic loss, while leaving the house edge unchanged.
No arrangement of wagers can change the underlying maths. Our explainer on the house edge covers why in detail.
About the author
Dana Reyes, Games editor
Dana has spent a decade writing rules explainers and probability breakdowns for beginners. She learned craps standing at a table with a printed cheat sheet and has been translating game maths into plain English ever since.
Share
