The zero pocket is not a normal number
Most roulette bets treat 0 as a losing number, even though it sits on the wheel and on the layout. That single fact explains almost every surprised reaction at the table. A player who bets on red watches the ball land in a green pocket and assumes the bet should lose, which it does. A player who bet on the number 0 directly watches the same spin and gets paid. The green pocket is a normal number for some bets and a special losing condition for others, and the difference is entirely mechanical.
Roulette wheels come in two standard layouts. A European wheel has 37 pockets, numbered 0 through 36, with a single green zero. An American wheel has 38 pockets, adding a second green pocket marked 00. The extra green pocket is not cosmetic: it changes the arithmetic on every bet that treats green as a losing number, because it adds one more losing outcome without adding any winning one.
What the green pocket does to each bet type
When the ball lands on 0 or 00, the dealer settles each wager according to the bet's own rule. Some bets lose outright, some are held for a second spin under a rule that varies by table, and one small family of bets wins at fixed odds. The table below sets out the standard resolution for the main roulette bets.
| Bet type | What happens when 0 or 00 hits | What the player should check |
|---|---|---|
| Straight-up on 0 or 00 | Wins at the table's fixed odds for a single number | The payout printed on the layout |
| Red, black, odd, even, high, low | Loses on a European wheel; loses on an American wheel | Whether the table uses a 'la partage' or 'en prison' rule |
| Dozens and columns | Loses | No special zero rule applies |
| Split, street, corner, six-line | Loses unless the zero is one of the covered numbers | Whether the zero is inside the chosen group |
| Zero-specific group bets | Wins if the group includes the zero that hit | The group's printed payout |
Two European rule variants soften the loss on even-money bets when the zero appears. Under 'la partage', the player loses only half the even-money wager. Under 'en prison', the full wager is held in place for the next spin; if the next spin wins, the stake returns, and if it loses, the stake is collected. These rules apply only to the even-money outside bets, and only when the table advertises them. An American wheel rarely carries either rule, which is one reason the two layouts play differently even before the double zero is considered.
Why the green pocket exists
The zero pocket is the mechanism that gives the house its mathematical advantage on most roulette bets. If a wheel had 36 pockets and paid 35 to 1 on a straight-up number, a player betting every number once would stake 36 units and receive 36 units back, and the game would be a fair coin-flip with no long-run edge for either side. The zero breaks that symmetry. On a European wheel, a straight-up bet wins on 1 pocket and loses on the other 36, while paying 35 to 1. Over a very large number of spins, the shortfall between the true odds and the payout odds is the house edge on that bet. The American double zero widens the same shortfall on every bet that treats green as a loser.
House edge and Return to Player (RTP) are complements. A theoretical percentage of total wagered money a game returns to players over a very large number of spins or hands, RTP is a long-run statistical average, not a per-session guarantee. House edge is the mathematical advantage the operator holds on a given game, expressed as a percentage of each wager. For the same bet under the same rule set, the two figures sum to 100%.
Reading the table before you sit down
Every roulette table carries the information that determines what a green hit means for you. The layout prints the payout for each bet. The table signage or the felt itself states whether the wheel is European or American, and whether a partage or prison rule applies. Before buying in, check three things: the number of green pockets, the printed payout on the bet you intend to make, and any rule text attached to the even-money boxes.
Buy-in follows the same sequence at most tables. You place cash on the felt, the dealer exchanges it for coloured chips, and those chips carry a value assigned to you at that table. Roulette chips are not cash chips; they must be converted back at the same table before you leave. When the dealer calls no more bets, the ball is already in motion, and any chip placed after the call is returned or moved at the dealer's discretion. Settlement happens after the ball rests in a pocket and the dealer places the marker on the winning number. Losing bets are swept first, then winning bets are paid, and only after the marker is lifted may new bets be placed.
Where players get the zero wrong
The most common procedural mistake is assuming an even-money bet covers the zero in some special way. It does not. Red, black, odd, even, high and low all lose to the green pocket unless the table's published rule says otherwise. A second mistake is pressing a losing outside bet after a zero appears, reasoning that the zero is 'due' to be followed by a compensating result. Each spin is an independent event produced by the random number generator or physical wheel, and no outcome is owed. A third mistake is failing to notice which wheel is in play. A player who has learned the European layout's arithmetic and then sits at an American table has added a second green losing pocket to every outside bet without changing the payout.
What the green pocket does not change
Hitting green does not change the payout on any other bet, does not alter the house edge mid-session, and does not make the next spin more or less likely to land anywhere. The zero is simply one more pocket on the wheel, with a special role in the bet settlement rules. The strategic question for a player is not how to avoid the zero, since it cannot be avoided on a standard wheel, but which bets carry the smallest edge under the rule set in use. Different bets on one roulette table carry materially different edges, and the zero's effect is largest on the bets that treat it as a loser.
FAQ
Does 0 count as even or odd in roulette?
Neither. The zero pocket is a separate category, and on a standard layout it loses on both even and odd bets. Some tables offer a zero-specific group bet, but that is a distinct wager with its own printed payout.
What is the difference between 0 and 00?
They are two separate pockets on an American wheel, each green, each treated as its own number for straight-up bets. For outside bets such as red or black, both act as losing numbers, which is why the American layout carries a larger house edge on those bets than a European wheel with a single zero.
If I bet on black and 0 hits, do I get half my money back?
Only when the table advertises a rule such as la partage, and only on the even-money bets. On a standard table without that rule, the full even-money wager loses to the zero. Check the table's printed rule text before relying on any half-return.
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