The Wheel You Sit Down To
You walk up to a roulette table, buy in, and the first thing you see is a wheel with numbered pockets around its rim. The numbers run from 0 to 36. That means the highest number on the wheel is 36, and there are 37 pockets in total on a European single-zero wheel. If you are looking at an American layout, there is an extra pocket marked 00, which brings the count to 38 pockets while the highest number stays 36. The 00 is not a higher number; it is an additional zero.
The numbers are not arranged in numerical order around the wheel. The sequence is designed to alternate red and black, high and low, odd and even as much as the layout allows. The 0 pocket is green, and on an American wheel the 00 is green too. Knowing the top number is easy; knowing where the numbers sit and what the different bets pay is what matters when you sit down to play.
The Sequence of a Round
A round of roulette moves through a fixed sequence. You place chips on the layout before the dealer announces that no more bets are accepted. The dealer spins the wheel in one direction and sends the ball travelling in the opposite direction around the outer track. The ball loses speed, drops into the wheel, and settles in one pocket. The dealer marks the winning number on the layout, clears losing bets, and pays winners. Then the next round begins.
The buy-in happens before any of that. You hand cash to the dealer, who exchanges it for roulette chips. These chips are not the standard casino chips used at other tables; they are colour-coded to you so the dealer can tell whose bets are whose on the layout. You cannot cash roulette chips at the cashier cage. They must be exchanged back into regular casino chips at the table before you leave.
Each decision point in a round is simple. You choose which numbers or groups of numbers to cover, you choose how much to stake on each, and you decide when to stop betting for that spin. There is no decision to make after the ball is in motion. The wheel decides the outcome.
What the Numbers on the Layout Mean
The table layout mirrors the wheel but arranges the numbers in a grid of three columns and twelve rows, with the zero or zeros at the top. Every bet you can place is a way of covering one or more numbers on that grid. A straight-up bet covers a single number. A split covers two adjacent numbers. A street covers three numbers in a row. A corner covers four. A six-line covers two adjacent rows. Outside the grid, you can bet on red or black, odd or even, high or low, dozens, or columns.
Each bet type pays according to how many numbers it covers. The fewer numbers you cover, the larger the payout when the ball lands on one of them. But the payout never fully compensates for the true odds, and that gap is the house edge. On a European wheel, every bet carries the same house edge because the single zero is the only pocket that belongs to the house. On an American wheel, the double zero adds a second house pocket, which increases the edge across the board.
The comparison below shows how the main bet types differ in coverage and payout on a European wheel.
| Bet type | Numbers covered | Payout | What changes with the wheel type |
|---|---|---|---|
| Straight-up | 1 | 35 to 1 | Same payout on both wheels; American wheel has one extra losing pocket |
| Split | 2 | 17 to 1 | Same payout; edge rises on American wheel |
| Street | 3 | 11 to 1 | Same payout; edge rises on American wheel |
| Corner | 4 | 8 to 1 | Same payout; edge rises on American wheel |
| Six-line | 6 | 5 to 1 | Same payout; edge rises on American wheel |
| Red/black, odd/even, high/low | 18 | 1 to 1 | Zero and double zero are neither red nor black, neither odd nor even, and neither high nor low |
| Dozen or column | 12 | 2 to 1 | Same payout; edge rises on American wheel |
The payouts are fixed by the layout. What changes between wheel types is the number of pockets that are not covered by any of these bets. The zero and double zero sit outside the red/black, odd/even, and high/low categories, and they are not part of any dozen or column. Every spin that lands in a zero pocket takes every even-money bet on the table.
European and American Wheels Side by Side
The difference between the two common wheel types is structural, not cosmetic. A European wheel has 37 pockets: the numbers 1 through 36 plus a single 0. An American wheel has 38 pockets: the same 36 numbers plus a 0 and a 00. The extra pocket does not change the top number, but it changes the mathematics of every bet.
On a European wheel, a straight-up bet on one number pays 35 to 1 while the true odds against hitting that number are 36 to 1. That one-pocket gap is the house edge. On an American wheel, the same bet still pays 35 to 1, but the true odds against hitting it are 37 to 1. The gap is wider.
| Feature | European wheel | American wheel |
|---|---|---|
| Pockets | 37 | 38 |
| Zero pockets | 1 (single 0) | 2 (0 and 00) |
| Highest number | 36 | 36 |
| House edge on any bet | Lower | Higher |
| Where you usually find it | Common in many regions | Common in some regions and on some cruise ships |
If a table offers a choice, the wheel with fewer zero pockets is the one with the lower expected rate of loss on the same bet. That is not a strategy for winning; it is a choice about which game structure you sit down at. The house edge is built into the wheel, and no betting pattern removes it.
What Strategy Charts Do and Do Not Do
Roulette is not a game where a strategy chart changes the odds the way basic strategy does in blackjack. In blackjack, the decisions you make after seeing your cards and the dealer's upcard change the expected loss of the hand, and published charts derive from the exact rule set in use: the number of decks, whether the dealer stands or hits on soft 17, and which doubling and splitting options are allowed. Change one rule and the correct decision on a marginal hand can change.
Roulette has no equivalent decision tree. Every bet carries the same house edge on a given wheel, and no choice you make after the ball is spinning alters the outcome. What you control is which bets you place, how much you stake, and how long you stay at the table. A player who wants to slow the expected rate of loss can choose bets that cover more numbers, but those bets pay less when they win. The trade-off is between frequency of winning spins and size of payout, and the house edge sits underneath both sides of that trade-off.
Procedural Mistakes That Cost New Players
The first mistake is betting after the dealer has called no more bets. Once the ball is in motion and the dealer has closed the round, any chip placed on the layout is too late. If the ball then lands on a number you meant to cover, the bet does not count. The dealer will push the late chip back to you, and you have missed the spin.
The second mistake is leaving the table with roulette chips still in your hand. Roulette chips are only valid at the table where they were issued. The cashier will not exchange them. You must ask the dealer to colour you up into regular casino chips before you step away. If you forget and walk off, you will have to return to the same table to convert them.
The third mistake is misreading the layout when placing a neighbour or call bet. Some tables allow announced bets that cover sections of the wheel rather than sections of the layout, such as a group of numbers that sit next to each other on the wheel. These bets are placed verbally with the dealer, and the payout depends on the exact group you announce. If you are new to the table, place your chips on the layout yourself rather than calling a bet you do not fully understand.
The fourth is assuming the previous spins tell you anything about the next one. The wheel has no memory. A number that has not appeared for fifty spins is not due to appear. Each spin is an independent event, and the probabilities are the same on every spin. The display board showing recent numbers is a record of what has happened, not a forecast of what will happen next.
FAQ
Why does roulette go up to 36 instead of a round number like 40?
The 36-number layout comes from the structure of the betting grid. Thirty-six divides neatly into twelve streets of three numbers, three columns of twelve, and two halves of eighteen for the even-money bets. The zero sits outside that grid as the house pocket, which is why the wheel has 37 or 38 pockets while the highest number is 36.
Is the 00 on an American wheel a higher number than 36?
No. The 00 is an additional zero pocket, not a number higher than 36. It functions the same way as the single 0: it is green, it is not part of any red/black, odd/even, high/low, dozen or column bet, and it is a losing pocket for all of those wagers.
Does the highest number on the wheel affect the odds?
The top number itself does not change the odds. What changes the odds is the number of zero pockets on the wheel. A wheel with 37 pockets and one zero gives the house a smaller edge than a wheel with 38 pockets and two zeros, even though both wheels run from 0 to 36.
Gamble responsibly. If you or someone you know has a gambling problem, call the helpline printed in the footer below for confidential support.
Play responsibly
Gambling should be treated as paid entertainment, never as a way to earn income or recover losses. 1-800-MY-RESET (1-800-697-3738)
18+ or 21+ depending on where you are; follow the minimum age that applies to you.
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.