You are on the roulette screen, the betting grid looks familiar, and then you notice the wheel label: European or American. That one detail changes the odds immediately. A single extra pocket on the American wheel shifts every standard bet against the player a little more than the European version.
The practical reason is simple enough to see on the wheel itself. European roulette has 37 pockets, numbered 1 to 36 plus a single zero. American roulette has 38 pockets, with 1 to 36 plus both 0 and 00.
Everything that follows starts there. If a bet wins only when one specific pocket lands, your chance depends on how many total pockets exist. Add one more losing pocket, and the probability drops.
Why the extra pocket matters
Roulette outcomes are based on pocket count. For a straight-up bet on one number, the ball must land in exactly one pocket.
On a European wheel, that means a 1 in 37 chance. On an American wheel, it is 1 in 38. The printed payout for that bet is commonly 35 to 1 on both wheel types, but the true probability is not the same.
That gap between the true odds and the payout odds is where the house edge comes from. For the same defined wager and rule set, house edge and RTP add to 100%.
| Wheel type | Total pockets | Straight-up win chance | Common straight-up payout | House edge on standard bets |
|---|---|---|---|---|
| European | 37 | 1/37, about 2.70% | 35 to 1 | About 2.70% |
| American | 38 | 1/38, about 2.63% | 35 to 1 | About 5.26% |
Those house-edge figures are the part many readers want to compare first, and for good reason. Standard American roulette roughly doubles the mathematical advantage held by the house compared with standard European roulette.
European vs American roulette odds by bet type
The difference is not limited to betting a single number. It runs through the full standard layout because zero and double zero are outside the red or black, odd or even, and high or low groupings.
Take a red bet. There are 18 red pockets on both wheels. Yet the total number of pockets differs.
European red wins 18 times out of 37, or about 48.65%. American red wins 18 times out of 38, or about 47.37%. The common payout stays 1 to 1 either way, so the extra pocket reduces the probability without increasing the reward.
| Bet type | European win chance | American win chance | Common payout |
|---|---|---|---|
| Straight-up (1 number) | 1/37, about 2.70% | 1/38, about 2.63% | 35 to 1 |
| Split (2 numbers) | 2/37, about 5.41% | 2/38, about 5.26% | 17 to 1 |
| Street (3 numbers) | 3/37, about 8.11% | 3/38, about 7.89% | 11 to 1 |
| Corner (4 numbers) | 4/37, about 10.81% | 4/38, about 10.53% | 8 to 1 |
| Dozen or column (12 numbers) | 12/37, about 32.43% | 12/38, about 31.58% | 2 to 1 |
| Red/black, odd/even, high/low | 18/37, about 48.65% | 18/38, about 47.37% | 1 to 1 |
Notice the pattern. The payouts usually look identical across the two versions, but the winning chances are slightly worse on the American wheel because of the extra 00 pocket.
What “odds” means here
People use the word odds in two different ways, and that causes confusion. Sometimes they mean the probability of winning a bet. Other times they mean the posted payout.
Roulette tables often show the same payouts whether the wheel is European or American. That can make the games look equivalent at a glance. They are not equivalent, because the probability behind each payout has changed.
A quick example makes this clearer. Imagine 38 units placed one at a time on the same single number on an American wheel, one unit per spin. In a purely theoretical spread of outcomes matching the wheel probabilities exactly, you would expect one hit and 37 misses. One hit at 35 to 1 returns 36 units total, including the original stake, leaving a net loss of 2 units across 38 wagered. That is the 5.26% house edge in action.
Run the same kind of thought experiment on a European wheel over 37 spins. One hit returns 36 units total, against 37 units wagered, for a net loss of 1 unit. That corresponds to about 2.70%.
Real sessions do not unfold that neatly, of course. Short-term results can swing far above or below those averages.
Over what horizon these numbers hold
This is where roulette math is often misread. The percentages are long-run expectations, not predictions for your next 12 spins or even your next 200.
RTP is a theoretical share of total wagers returned over a very large number of spins, and the house edge is the complementary percentage for that same game and ruleset. For standard roulette bets, European roulette works out to an RTP of about 97.30%, while American roulette works out to about 94.74%.
That does not mean a player in one evening will “get back” those exact amounts. One session might end with no significant hits at all. Another might include an early straight-up win and finish well above the long-run average.
Roulette has variance even though its bet structure is simple. Outside bets such as red/black tend to produce more frequent but smaller outcomes. Straight-up bets hit rarely, but the payout is much larger when they do. The underlying house edge on standard bets stays the same within each wheel type.
The most common misreading
The usual mistake is to treat European roulette as favorable because its house edge is lower. Lower does not mean positive expectation for the player. It means the average loss per unit wagered is smaller than on the American wheel, assuming the same kind of standard bet structure.
Another common mistake is to think the lower edge becomes meaningful only over huge bankrolls. In fact, the difference appears on every spin in expectation. Suppose two players each make 120 even-money bets of 5 units each, one on a European wheel and one on an American wheel. Each has wagered 600 units in total. Theoretical expected loss is about 16.2 units on the European wheel and about 31.6 units on the American wheel. Actual results can differ sharply, but the comparison shows how the gap scales with total wagering.
That is why the extra pocket matters more than the layout’s familiar appearance suggests. The betting options look almost the same. The math underneath is not.
Are there any exceptions?
Some roulette variants use special rules on certain even-money bets, commonly called rules such as La Partage or En Prison. Those can reduce the house edge on qualifying bets on some single-zero layouts.
Not every European-labelled game includes such rules, and American roulette is generally discussed without them. For a clean comparison of roulette European vs American odds, the standard baseline is this: single-zero European roulette has a lower house edge than double-zero American roulette across the usual bet types.
That baseline is the reason the two wheel types are not interchangeable from a math point of view. Same style of table. Different probability model.
How to compare them quickly on a table
You do not need to memorize every percentage. Check the wheel type first.
- If the wheel shows only one zero, it is European-style with 37 pockets.
- If the wheel shows both 0 and 00, it is American-style with 38 pockets.
- If posted payouts are the standard ones, the single-zero wheel has the lower house edge.
- If a special rule is listed for even-money bets, read that rule separately because it can change those bets only.
That last point matters because “roulette odds” can refer to the whole game or to one specific wager. The exact percentage always belongs to a particular bet under a particular rule set.
FAQ
Is European roulette better than American roulette?
From a mathematical point of view, standard European roulette has a lower house edge because it has one zero instead of both 0 and 00. That changes the long-run expectation on standard bets.
Do European and American roulette pay the same on winning bets?
Many standard bets commonly use the same posted payouts on both wheel types. The difference is that the American wheel has an extra losing pocket, so the probabilities behind those payouts are worse.
Does lower house edge mean I will lose less in one session?
Not necessarily in a single session. Short-term results vary a lot. Lower house edge means a lower theoretical average loss over many wagers on the same defined bet and rule set.
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This article is general information about how these mechanics work. It is not legal advice and not a recommendation to gamble or to use any particular operator. Availability and legality differ by jurisdiction — check the rules that apply where you are.