Roulette carries a certain mystique, and that green zero often attracts questions. One frequent query at the table is whether 0 counts as an even number in the game’s bets.
This article separates fact from rumour, explains how casinos treat zero, and shows how that treatment affects different wager types. Read on to understand where zero belongs on the wheel and what that means for your betting choices.
Understanding Zero on the Roulette Wheel
Zero occupies a distinct, easily recognisable pocket on the wheel. It is coloured green and set apart from the red and black numbers that make up the rest of the wheel. This visual separation signals that zero has a special role in the game.
On European-style wheels there is a single zero. On American-style wheels there are two green pockets, labelled 0 and 00. Their positions relative to neighbouring numbers vary between wheel layouts, but the key point is the same: zero is not grouped with the red or black, odd or even clusters that form the majority of the wheel.
Seeing how zero stands apart on the wheel helps explain why questions about its classification arise next, particularly whether it should be treated as even in the context of roulette.
Is Zero Even or Odd in Mathematics?
Mathematically, zero is an even number. An even integer is one that can be divided by two with no remainder, and dividing 0 by 2 yields 0 with no remainder. That places zero alongside numbers such as -4, 0, 2 and 4 in the even category.
This fits with the idea of parity in mathematics. Even numbers can be written as 2k for some integer k, and zero corresponds to k = 0. In modular arithmetic, zero is congruent to 0 modulo 2, which is the same residue class shared by all even numbers. These perspectives show that zero behaves like every other even integer under addition, subtraction and multiplication.
Roulette, however, applies a different practical rule. Despite zero’s mathematical status, the wheel and betting regulations treat the green pocket separately from ordinary even and odd wagers. When the ball lands on zero, most even-money bets such as Red/Black, even/odd or high/low are conventionally resolved as losses or follow special rules, depending on the particular version of the game.
That distinction matters once you start staking chips on outside bets, which is what the next section examines. It is also why players and house rules refer to zero as a unique outcome in play, rather than categorising it with the even numbers in a mathematical sense.
Common Misconceptions About Zero in Roulette
There are several persistent beliefs about zero that can mislead players. A common one is to assume the mathematical property of zero translates directly into table play and thus that zero should win on even-number bets. Another is to think zero gives some players a hidden advantage; in reality its effect is systematic and built into the game’s payouts.
Players sometimes point to zero’s position near even numbers on the wheel as evidence it belongs with the evens. Visual proximity on the wheel is not the same as inclusion in a bet type. Casino rules define which numbers are covered by each wager, and zero is frequently excluded from outside bets for a clear reason: it is treated as an independent outcome on the layout.
Casinos allow zero to be covered only by specific inside bets; outside bets that look like near 50/50 chances are left vulnerable to that separate green pocket. The following section outlines which bets can include zero and which cannot.
Roulette Bet Types: Where Does Zero Fit In?
Roulette offers a mix of inside and outside bets, and zero’s role varies between them. Inside bets are placed directly on numbers or small groups of numbers and are the only bets that normally include zero. Outside bets cover broader categories and usually exclude zero.
A straight-up bet placed on zero pays out if zero is the outcome. Splits can include zero on European-style layouts when paired with adjacent numbers such as 1, 2 or 3. There is a special corner covering 0, 1, 2 and 3 on some tables. On American-style wheels, a basket wager can include 0 and 00 alongside 1, 2 and 3.
Outside bets such as Red/Black, Odd/Even and High/Low do not include zero and lose when the ball lands in the green pocket. Understanding which bets cover zero clarifies how that pocket shapes the game’s odds, which is explained next.
Impact of Zero on Roulette Outcomes
Zero changes the effective probabilities for many wagers. Because it is a single pocket (or two on double-zero wheels) excluded from outside bets, it reduces the chance that those wagers will win compared with a true 50/50 split.
On a single-zero wheel there are 37 pockets in total, so an outside bet that covers 18 numbers has a probability of 18 out of 37 of winning. On a double-zero wheel there are 38 pockets and the equivalent chance is 18 out of 38. That gap between perceived 50/50 and the actual odds created by zero is the fundamental reason for the house edge in roulette.
Inside bets that include zero pay when the green pocket is the result, but those payouts are balanced against the lower probability of hitting a single specific pocket. With those mechanics in mind, the next section looks specifically at how zero is treated in even-money bets.
Is Zero Included in Even Money Bets?
Zero is not included in even-money bets. Red/Black, Odd/Even and High/Low each cover only the non-zero numbers assigned to those categories, so a result of zero causes those wagers to lose.
For Red/Black, the colour assignment excludes green entirely, so zero never counts as red or black. For Odd/Even, zero’s mathematical parity is not applied in table rules; it does not qualify as a winning even number for that bet. High/Low similarly excludes zero because it sits outside the numeric ranges used for those bets.
This consistent exclusion across wheel styles reinforces why players often see zero as the defining factor in roulette’s house advantage. Keep this in mind when choosing bet types and considering how much of the wheel your stake actually covers.
Final statement: understanding how zero is treated—visually, mathematically and in betting rules—lets you make clearer choices at the table and shows why that single green pocket has an outsized influence on the game.
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**The information provided in this blog is intended for educational purposes and should not be construed as betting advice or a guarantee of success. Always gamble responsibly.