The pocket that decides everything
Every spin of a roulette wheel ends the same way: a ball drops into one numbered pocket. When that pocket is zero, the entire table pauses for a moment because zero does not behave like the other numbers. It is not red, it is not black, it is not odd, it is not even, and it is not covered by most of the outside bets that players use to spread risk across the layout. Zero is the pocket that gives the game its mathematical structure, and what it does to your money depends on three things: which wheel you are sitting at, which bet you placed, and which table rule the venue applies to losing even-money wagers.
Before the spin, zero looks like just another number on the felt. After the spin, it is the single most important pocket on the wheel. Understanding it is not a detail. It is the difference between knowing what you are risking and guessing.
Two wheels, two different zeros
Roulette is played on two main wheel layouts, and the difference between them is exactly one pocket. A European wheel has 37 pockets: the numbers 1 through 36 plus a single zero. An American wheel has 38 pockets: the same 36 numbers plus a single zero and a double zero. That one extra pocket is not decoration. It changes the arithmetic of every bet on the table.
The zero pockets are green on both layouts. They sit between the red and black numbers, breaking the colour sequence. That placement matters because most outside bets are built on binary categories: red or black, odd or even, low half or high half. When the ball lands in a green pocket, none of those categories wins. The bet loses outright unless the table applies a special rule, which we will get to in a moment.
The key point is that the zero pocket is the house's pocket. It is the reason the payout on a winning straight-up number is 35 to 1 when there are 36 or 37 losing numbers. The gap between the payout and the true odds is the house edge, and the zero pocket is where that gap lives.
What zero does to each bet type
Roulette bets fall into two broad families: inside bets, which sit on the numbered grid, and outside bets, which sit around the perimeter of the layout. Zero treats these two families very differently.
If you placed an inside bet and the ball lands on zero, your bet loses unless that inside bet covered zero. A straight-up bet on zero wins. A split bet that includes zero wins. A street, corner, or line bet that includes zero wins at the normal payout for that bet type. Any inside bet that does not include zero simply loses, exactly as it would if the ball landed on any other uncovered number.
Outside bets are where zero creates the most confusion. A bet on red loses on zero because zero is green. A bet on black loses for the same reason. A bet on odd loses because zero is not odd. A bet on even loses because zero is not even. A bet on the low half, usually 1 through 18, loses because zero is not in that range. A bet on the high half, usually 19 through 36, loses for the same reason. In short, on a standard table with no special rule, every outside bet loses when the ball lands on zero.
Here is the comparison laid out clearly:
| Bet type | What happens on zero | Payout if it wins |
|---|---|---|
| Straight-up on zero | Wins | 35 to 1 |
| Split, street, corner, or line including zero | Wins at the normal rate for that bet | Varies by bet type |
| Straight-up on any other number | Loses | 35 to 1 when it wins |
| Red or black | Loses on a standard table | 1 to 1 |
| Odd or even | Loses on a standard table | 1 to 1 |
| Low half or high half | Loses on a standard table | 1 to 1 |
| Dozen or column | Loses unless the bet's range includes zero | 2 to 1 |
One nuance worth knowing: on some layouts, the zero is included in a column or a dozen. On a European wheel, zero typically sits at the top of the number grid and may be part of the first column or a specific dozen. On an American wheel, zero and double zero often sit together at the top of the columns. Whether zero is covered by a column or dozen bet depends on the physical layout of the felt in front of you. Check the printed table before you bet, because it changes what that bet covers.
When the table gives you a second chance
Some European tables apply a rule that softens the blow of zero on even-money outside bets. The two most common versions are called en prison and la partage, and they only apply to even-money bets: red or black, odd or even, low or high.
Under la partage, when the ball lands on zero, the player receives half the even-money stake back immediately. The other half is lost. This is a clean, simple rule: you bet 10 units on red, zero lands, you get 5 units back and the house keeps 5.
Under en prison, the losing even-money stake is not collected immediately. Instead, it is held "in prison" on the table for the next spin. If the next spin wins for that bet, the player gets the original stake back without any additional winnings. If the next spin loses, the stake is collected. If the next spin is another zero, the stake typically remains in prison for another round, depending on the house rules.
These rules matter because they reduce the house edge on even-money bets. A table with la partage or en prison is a materially different game from a table without them, even when both use a European wheel. The rule is printed on the table layout or in the venue's game rules, and it is worth reading before you sit down. If you do not see it stated, assume the standard rule applies: zero takes the whole even-money bet.
Where the house edge comes from
Roulette is a negative-expectation game. That means the house keeps a mathematical advantage on every bet, and that advantage is built into the wheel itself. The zero pocket is the mechanism.
On a European wheel, there are 37 pockets. A straight-up bet on any single number pays 35 to 1. If the payout were fair, it would pay 36 to 1, because there are 36 losing numbers for every winning one. The missing unit is the house edge. The same logic applies to every other bet on the layout. The zero pocket is the extra losing pocket that creates that gap.
On an American wheel, the double zero adds a second extra pocket. The same straight-up bet still pays 35 to 1, but now there are 37 losing numbers instead of 36. The house edge is therefore larger on an American wheel than on a European wheel, all else being equal. This is not a matter of opinion or strategy. It is arithmetic. The wheel with more zero pockets is the wheel with the larger built-in advantage for the house.
That does not mean you cannot win on an American wheel. You can. Roulette is a game of independent spins, and short-run results can diverge dramatically from the long-run average. A player can hit a straight-up number on the first spin of the night. But over a very large number of spins, the zero pockets pull the results toward the house. The expected rate of loss is higher on a wheel with two green pockets than on a wheel with one.
What you control and what you do not
You do not control where the ball lands. You do not control the wheel, the dealer, or the sequence of spins. What you control is narrower, but it is real: which wheel you choose to play, which bets you place, how much you stake on each spin, and how long you stay at the table.
Choosing a European wheel over an American wheel, when both are available, is a choice that changes the expected rate of loss on every bet you make. Choosing a table with la partage or en prison changes it again on even-money bets. Choosing an inside bet with a specific payout changes the variance of your session: a straight-up bet pays rarely but pays large, while an even-money bet pays often but pays small. None of these choices turns roulette into a winning game. They change the shape of the risk, not the direction of the long-run expectation.
One procedural mistake new players make is assuming that zero is covered by an even-money bet because it sits next to the colours on the layout. It is not. Another is placing a straight-up bet on zero as a "safer" hedge against losing outside bets. A straight-up bet on zero is the same 35-to-1 long shot as any other single number. It does not protect anything. A third mistake is failing to check which wheel type the table uses before buying in. The difference between 37 and 38 pockets is printed on the layout and visible on the wheel itself, and it changes the arithmetic of every spin you play.
FAQ
Does zero pay more than other numbers in roulette?
No. A straight-up bet on zero pays the same 35 to 1 as a straight-up bet on any other single number. Zero is not a special payout. It is a special pocket because it is not covered by the even-money outside bets, but the payout for betting on it directly is identical to any other straight-up number.
If I bet on both red and black, do I break even when zero lands?
No. On a standard table, both bets lose when the ball lands on zero, because zero is neither red nor black. Betting both sides of an even-money proposition does not create a hedge against zero. It simply doubles the amount you lose when the green pocket appears.
Why do some roulette wheels have two zeros?
The double zero is a feature of the American wheel layout, which has 38 pockets instead of the 37 on a European wheel. The second green pocket increases the house edge on every bet, because the payouts remain the same while the number of losing pockets goes up by one. The wheel type is always visible on the layout and on the wheel itself before you place a bet.
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