The Wheel You Are Looking At
You walk up to a roulette table and the first thing you notice is the wheel. On an American layout, the wheel carries 38 pockets in total. The numbers 1 through 36 alternate between red and black. Then there are two green pockets: a single zero and a double zero. That second green pocket is the defining feature of the American wheel, and it is the reason every bet on this layout behaves differently from the same bet on a single-zero wheel.
The numbered pockets are not arranged in numerical order around the wheel. The sequence is designed to scatter high and low numbers, odd and even numbers, and red and black pockets around the circumference as evenly as the geometry allows. The zero and double zero sit opposite each other, and the pattern means no simple section of the wheel contains a run of numbers that all share one colour or one parity.
Reading the Table Layout
The felt where you place chips mirrors the wheel but arranges the numbers in a grid. The numbers 1 through 36 sit in three columns of twelve rows. Above them, at the head of the layout, sit the single zero and the double zero. Around the outside of the grid are the boxes for the outside bets: red, black, odd, even, low numbers 1 through 18, high numbers 19 through 36, the three dozens, and the three columns.
A bet placed directly on a number is an inside bet. A bet placed on one of the surrounding boxes is an outside bet. The distinction matters because inside and outside bets pay at different odds and lose at different rates, even though every bet on the table is settled against the same 38-pocket wheel.
How a Round Runs
A round begins when the dealer, sometimes called the croupier, opens betting. You place chips on the layout yourself, or you hand cash to the dealer and receive colour-specific value chips that identify your stack at a crowded table. Once the dealer calls an end to betting, the ball is launched in the opposite direction to the spinning wheel. From that moment no chips may be placed or moved.
The ball loses speed, drops onto the wheel, bounces across the frets between pockets, and settles in one of the 38. The dealer marks the winning number on the layout, clears all losing bets, and pays winning bets according to the posted odds. Only then does the next round's betting open. A full decision cycle from buy-in to settlement is just that: buy chips, place a bet, watch the spin, see the marker go down, and receive any payout before betting again.
What Each Bet Pays and Loses
Roulette payouts are built around the number of pockets a bet covers. A straight-up bet on one number pays 35 to 1. A split on two numbers pays 17 to 1. A street on three numbers pays 11 to 1. The payouts are fixed, but the chance of winning is set by the wheel, and on an American wheel the chance is always slightly worse than the payout implies because of the two green pockets.
Here is how the main bets compare on an American wheel:
| Bet | Pockets covered | Payout | Why the edge sits where it does |
|---|---|---|---|
| Straight up | 1 of 38 | 35 to 1 | True odds would be 37 to 1; the shortfall is the house edge |
| Split | 2 of 38 | 17 to 1 | True odds would be 18 to 1 |
| Street | 3 of 38 | 11 to 1 | True odds would be roughly 11.67 to 1 |
| Corner | 4 of 38 | 8 to 1 | True odds would be 8.5 to 1 |
| Six line | 6 of 38 | 5 to 1 | True odds would be roughly 5.33 to 1 |
| Red, black, odd, even, 1-18, 19-36 | 18 of 38 | 1 to 1 | Wins on 18 pockets, loses on 20; the two green pockets create the gap |
| Dozens and columns | 12 of 38 | 2 to 1 | Wins on 12 pockets, loses on 26 |
The house edge and the return to player are complements: they sum to 100% for the same bet under the same rule set. The American wheel's second green pocket is what makes the edge on every bet larger than on a single-zero wheel. A bet on red loses on 20 pockets and wins on 18, so the gap between the two is wider than on a 37-pocket wheel where the same bet loses on 19 and wins on 18.
Where the Double Zero Changes Things
Some American tables carry a rule that changes only one bet: the five-number bet covering zero, double zero, one, two and three. It pays 6 to 1, which is the worst payout relative to the true odds on the layout. Not every table offers it, but when it is present it is the bet with the largest house edge on the table.
Another rule difference appears on some tables as surrender, sometimes called en prison on single-zero games. Where an American table offers a surrender variant, an even-money outside bet that loses to a zero may return half the stake instead of the whole stake. The rule does not change the wheel; it changes only how that one class of bet is settled. The posted table rules state whether surrender applies, and a player should read them before relying on it.
Because the wheel has 38 pockets, any system that changes bet size after a win or loss does not change the number of losing pockets. A progression alters how wins and losses are grouped across a session; it does not remove the two green pockets or the shortfall built into every payout.
Mistakes That Cost More Than the Bet
The first procedural mistake is betting after the dealer has called no more bets. Late chips are returned and the bet does not stand, but at a busy table a player who reaches across after the call can disrupt the layout. The second is placing a chip on a line between two numbers and assuming the dealer will read it as the split you intended. Stacked or misplaced chips are settled according to where they sit, not where the player meant them to go.
The third mistake is treating the two green pockets as neutral. They are not. On an American wheel, every outside bet that looks like an even chance is not even. The zero and double zero are losing pockets for red, black, odd, even, high and low, and they are the entire reason the payout on those bets is not a fair reflection of the chance.
A fourth mistake is confusing the wheel with a single-zero layout. A strategy chart or expected-loss figure written for a European wheel does not transfer to an American table. The extra pocket changes the arithmetic on every bet, so any published reference must match the 38-pocket layout before it is used.
FAQ
Why does the American wheel have two zeros?
The double zero is a design feature of the American layout. It gives the wheel 38 pockets instead of 37, and the extra pocket increases the gap between the true odds of any bet and the payout the table offers. The single zero and double zero are both green and both lose for most outside bets.
Is the number sequence the same on every American wheel?
The standard American wheel uses one fixed sequence of numbers around the circumference. Individual wheels from different manufacturers may vary slightly, but the layout of 1 through 36 plus zero and double zero is constant, and the zero pockets sit opposite each other on the standard design.
Does the double zero change every bet equally?
It changes every bet, but not by the same amount. The five-number bet covering zero, double zero, one, two and three carries the largest edge on the layout when it is offered. Even-money outside bets lose on both green pockets, while inside bets lose on them in the same way they lose on any other uncovered number.
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