The Green Pocket That Changes the Whole Table
Most roulette bets are built around red or black, odd or even, high or low. Zero belongs to none of those groups. It sits in a green pocket, matches no outside bet, and exists specifically to break the symmetry that would otherwise make the game a fair coin flip. When the ball lands there, nearly every even-money and outside wager on the table loses. That single pocket is the entire reason the casino holds an edge on the game.
On a European wheel, zero is one pocket among 37. On an American wheel, there are two green pockets: zero and double zero, making 38 in total. The presence of the second green pocket changes the arithmetic for every bet on the layout, even the ones that never touch it directly.
What Happens When Zero Hits
The sequence is simple. The ball drops into the green pocket, the dealer calls the number, and settlement begins. Bets placed directly on zero itself win. Bets on red, black, odd, even, high or low lose outright. Bets on columns and dozens lose as well, because zero sits outside all three columns and all three dozens. Inside bets on other numbers lose. The only wagers that survive a zero are those that specifically include it.
Some European tables soften this with a rule called la partage or en prison. Under those rules, an even-money bet that loses to zero is not collected immediately. With la partage, half the stake returns to the player. With en prison, the stake stays on the table for the next spin, and the player recovers it if the next spin wins. Not every table offers either rule, and the rule in force is printed on the layout or posted at the table. When neither applies, the even-money bet is simply lost, the same as any other losing wager.
Why Zero Creates the House Edge
A fair wheel would pay winners at odds that exactly match the probability of winning. With 36 numbers and no zero, an even-money bet would win 18 times in 36 and lose 18 times in 36, and a straight-up bet on one number would pay 35 to 1 against a 1-in-36 chance. The addition of zero means the wheel now has 37 or 38 pockets while the payouts stay the same. The player's chance of winning any given bet falls, but the payout does not rise to compensate.
That gap between the true odds and the payout odds is the house edge. On a European wheel, the single zero gives the house its advantage on every bet that does not include zero. On an American wheel, the double zero widens that gap further. The extra pocket does not change what any bet pays; it only changes how often the bet wins.
European and American Wheels Compared
The difference between the two wheel types is not cosmetic. It changes the expected rate of loss on identical bets. The table below shows the structural difference and what it means for the player.
| Feature | European wheel | American wheel |
|---|---|---|
| Total pockets | 37 | 38 |
| Green pockets | One (single zero) | Two (single and double zero) |
| Effect on even-money bets | Zero loses unless a la partage or en prison rule applies | Zero and double zero both lose, with no standard mitigation rule |
| Effect on straight-up bets | Pays 35 to 1 against a 1-in-37 chance | Pays 35 to 1 against a 1-in-38 chance |
| House edge on most bets | Lower, because only one green pocket exists | Higher, because the second green pocket reduces win probability without raising payouts |
If a table offers the choice, the European layout is the one with the smaller built-in disadvantage. That is not a way to win; it is a way to lose more slowly on the same wagers.
Betting on Zero Directly
Zero can be bet like any other number. A straight-up wager on zero pays 35 to 1, the same as a straight-up wager on any other single number. A split bet can cover zero and one neighbouring number, a street bet can cover zero, one and two, and on some layouts a basket bet covers zero, double zero and the first row of numbers. Each of these bet types carries its own probability and its own house edge, and they are not all equal.
On an American wheel, the basket bet covering zero, double zero, one, two and three is notable because it carries a materially higher house edge than most other bets on the table. The payout does not compensate for the reduced chance of winning. A player who wants to include zero in a wager is generally better served by a straight-up bet on zero alone than by the basket, though neither offers a positive expectation.
What Zero Does Not Do
Zero does not make the wheel predictable. Past spins do not influence future ones, and a run of red numbers does not make zero more likely to appear next. The wheel has no memory, and the probability of zero on any given spin is fixed by the number of pockets on that wheel: one in 37 on a European layout, one in 38 on an American one. No betting pattern changes that.
Zero also does not change the payout on winning bets that avoid it. A winning red bet still pays even money, and a winning straight-up bet still pays 35 to 1. What zero changes is how often those bets win, not what they pay when they do.
Reading the Table Before You Bet
Before placing a wager, look at the wheel and the layout. Count the green pockets. Check whether the table posts a la partage or en prison rule for even-money bets. Confirm the minimum and maximum stakes for inside and outside bets, since these often differ. The rule set in force determines the house edge on every bet at that table, and two tables in the same venue can operate under different rules.
If the table offers announced bets or call bets, those are wagers placed on sections of the wheel rather than positions on the layout. They exist mainly on European tables and involve combinations of numbers that include zero in some configurations. They are not a separate game; they are simply a different way of covering a group of numbers, and each carries its own probability and payout structure.
FAQ
Does zero pay more than other numbers?
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 losing condition for bets that do not include it.
What is the difference between zero and double zero?
They are two separate green pockets on an American wheel. Each is a distinct number with its own straight-up payout. The double zero exists only on American layouts, and its presence is what makes the American house edge higher than the European one on most bets.
Can I bet on zero and red at the same time?
Yes. The bets are independent. A wager on zero wins only if the ball lands in the zero pocket, and a wager on red wins only if the ball lands on a red number. If zero hits, the red bet loses and the zero bet wins. Placing both does not create a combined bet with a different edge; it is simply two separate wagers settled independently.
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