The Wheel That Changes the Arithmetic
When a roulette wheel has 38 spaces numbered 1 through 36, you are looking at the American layout. The two extra pockets beyond the numbered sequence are 0 and 00, and they are the reason a single table can offer two very different games depending on which side of the Atlantic it sits on. A European wheel carries 37 pockets with a single zero. The American version adds the double zero, and that one additional pocket is not a cosmetic difference. It shifts the house edge on nearly every bet you can place.
You do not need to memorise the wheel's sequence of numbers to play. The dealer handles the wheel, the ball, and the payouts. What you do need is a working sense of what your money is up against before you put a chip down. The wheel's structure determines that. Thirty-eight spaces means every individual number has a 1-in-38 chance of coming up on a given spin. The payout for a straight-up win on a single number is 35 to 1. That gap between the true odds of 37 to 1 and the payout of 35 to 1 is where the operator's advantage lives.
Reading the Layout Before You Buy In
The table has two parts: the wheel itself and the betting layout printed on the felt. The layout mirrors the wheel's numbers in a grid of three columns and twelve rows, with the 0 and 00 sitting at the top of the columns. Around the grid sit the outside bets: red or black, odd or even, low or high, dozens, and columns. Inside bets are the numbers themselves and the combinations that touch them.
Buy-in works the same way at most roulette tables. You place cash on the felt, never directly into the dealer's hand, and the dealer exchanges it for roulette chips. These chips are distinct from the chips used at other table games. Each player at the table receives a colour of their own, so the dealer can tell whose bet is whose when the layout fills up. Roulette chips carry no denomination printed on them. Their value is set when you buy in, and you cash them out at the same table before leaving. They are worthless at the cage or at any other table.
How a Round Moves
A spin follows a fixed sequence. The dealer announces that betting is open, and players place chips on the layout. When the ball is released, the dealer calls no more bets, and from that moment nothing on the felt may be touched. The ball loses momentum and drops into a pocket. The dealer places a marker on the winning number, clears all losing bets, and pays winners. Only after the marker is removed does betting reopen for the next spin.
The decision points are few, but they matter. You choose which bets to place and how much to stake on each. You choose when to stop. There is no skill element in the spin itself. The wheel and ball do not respond to strategy, and no betting pattern alters the physics. What changes from player to player is which bets they select, because different bets carry materially different edges.
Comparing the Main Bets
The American wheel's 38 pockets mean the house edge on most bets is higher than on the European wheel. The table below lays out the main bet types, their payouts, and how the double zero changes the picture.
| Bet type | What it covers | Payout | House edge on 38-space wheel |
|---|---|---|---|
| Straight up | One single number | 35 to 1 | Higher than the 37-space wheel |
| Split | Two adjacent numbers | 17 to 1 | Higher than the 37-space wheel |
| Street | Three numbers in a row | 11 to 1 | Higher than the 37-space wheel |
| Corner | Four numbers in a block | 8 to 1 | Higher than the 37-space wheel |
| Six line | Six numbers in two rows | 5 to 1 | Higher than the 37-space wheel |
| Red or black | 18 numbers of one colour | 1 to 1 | Higher than the 37-space wheel |
| Odd or even | 18 numbers | 1 to 1 | Higher than the 37-space wheel |
| Low or high | 1-18 or 19-36 | 1 to 1 | Higher than the 37-space wheel |
| Dozens | 12 numbers | 2 to 1 | Higher than the 37-space wheel |
| Columns | 12 numbers in a column | 2 to 1 | Higher than the 37-space wheel |
Every one of these bets pays as if the wheel had 36 spaces. The zero and double zero are not covered by the even-money outside bets, the dozens, or the columns. When the ball lands in either zero pocket, those outside bets lose in most American rules. That is the structural reason the edge is larger on the 38-space wheel than on the 37-space version. The payouts have not changed; the number of losing pockets has.
The Five-Number Bet and Why It Stands Out
One bet exists only on the 38-space American layout: the five-number bet covering 0, 00, 1, 2, and 3. It pays 6 to 1. Because it covers five numbers on a 38-space wheel, its house edge is worse than any other bet on the table. New players sometimes place it because it is easy to reach from the corner of the layout. It is worth knowing about precisely so you can avoid it if your goal is to keep the expected rate of loss as low as the game allows.
No bet on the American wheel removes the house edge. The question is only which bets carry the smallest one. The even-money outside bets and the dozens or columns are generally the gentlest options in terms of expected loss per unit wagered. Straight-up numbers carry the same edge as the outside bets in most rule sets, but their variance is far higher: you will lose many spins in a row before a hit, and the hit may not arrive within your session.
Procedural Mistakes That Cost More Than the Edge
The most expensive errors at a roulette table are usually procedural rather than strategic. The first is touching your chips after the dealer calls no more bets. A late hand on the felt can void a bet or, at minimum, draw a sharp correction. The second is trying to cash roulette chips at the cage. They must be exchanged at the table where they were issued. The third is misunderstanding the even-money bets when a zero hits. On most American tables, red, black, odd, even, low, and high all lose to 0 or 00. A player who assumes the zero is simply a neutral pocket is in for a surprise.
A fourth mistake is betting more than you intend because the coloured chips do not show a value. Keep track of what each chip is worth from the moment you buy in. The dealer will tell you, but only if you ask at the right time.
Variance, Session Length, and What You Control
Roulette is a negative-expectation game on every bet. The house edge is built into the payout schedule, and no progression system changes it. Doubling after a loss, for example, does not remove the edge; it redistributes outcomes so that many small wins are followed by occasional large losses. The wheel does not remember previous spins, and no number is due. Each spin is an independent event.
What you control is the selection of bets, the size of each stake relative to your bankroll, and the length of your session. A player who wants the lowest expected loss per hour on the American wheel will favour the outside bets and play slowly. A player who wants the chance of a large single payout will accept the higher variance of inside numbers. Neither choice changes the long-run average, but they produce very different sessions.
Where the Exact Rules Live
Roulette rules vary by venue and sometimes by table within a venue. The two most important variables are what happens to outside bets when a zero hits and whether any special rules apply to the five-number bet. Some tables return half of an even-money bet when the ball lands in zero; most American tables do not. The table's posted rules or the game information panel on an online version will state which rule applies. Read that before you sit down, because it changes the arithmetic on the bets you are most likely to place.
FAQ
Why does the American wheel have a higher house edge than the European wheel?
The American wheel adds a double zero pocket, bringing the total to 38 spaces, while the European wheel has 37. The payouts are the same on both wheels, so the extra pocket is an additional losing outcome for most bets. That single pocket is enough to raise the house edge across the layout.
Is there any bet on the American wheel with no house edge?
No. Every bet on the 38-space wheel pays less than the true odds of winning, which is how the house edge is built. The five-number bet covering 0, 00, 1, 2, and 3 carries a worse edge than the rest, but even the best bets on the layout leave the house with a mathematical advantage.
Do roulette chips work like regular casino chips?
They do not. Roulette chips are colour-coded to each player and have no printed denomination. Their value is set at buy-in and they must be exchanged back at the same table. Taking them to the cage or another table will not work.
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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.