Roulette is one of the most recognisable casino games, known for its spinning wheel and many betting choices. Yet that single green pocket marked 0 often causes confusion for players who are learning the bets and payouts.
This article explains what the 0 represents on the roulette wheel, how it is treated in the different bet categories, and why its presence matters to the house edge and your decisions at the table. Read on to clear up the confusion and see exactly where 0 fits into the game.
What Is the 0 in Roulette?
The 0 is a green pocket added to the roulette wheel that sits apart from the numbered red and black pockets. In standard single-zero wheels there is one such pocket, while some wheels include a second green pocket labelled 00. The green colour and separate positioning emphasise that 0 is not part of the normal red/black or odd/even sequences.
Because the 0 does not belong to those regular groups it changes how many bets are resolved. When the ball lands in 0, many of the even-chance wagers do not win. The way 0 is placed on the wheel and on the betting layout reflects this special status and is central to how payouts and odds are calculated. This distinction leads naturally into how the numbers themselves are classified on the table.
How Are Roulette Numbers Classified?
Roulette numbers are grouped for betting purposes in a few clear ways: odd or even, red or black, and high or low. The numbers 1 to 36 are split between odd and even in the usual arithmetic sense, and each of those numbers is coloured red or black according to the wheel’s pattern. High numbers run from 19 to 36 and low numbers from 1 to 18.
The 0 does not belong to any of these categories. It is not odd or even, it is not red or black, and it is not high or low. That leaves it as an independent outcome that requires special treatment in the rules. With that classification in place, the next question is how those rules apply when you place an even-or-odd wager.
Does 0 Count as an Even Number in Roulette?
No. The 0 is not counted as an even number for betting purposes. The even and odd betting boxes on the table cover only the numbers 1 to 36, so a spin that lands on 0 does not meet the conditions for an even outcome.
In practical terms this means an even bet loses if the result is 0. For example, a £5 stake on Even does not return a win or the stake when the ball stops in 0. Only results such as 2, 4, 6 and so on up to 36 produce a winning Even bet. This consistent treatment is why casinos maintain a long-term advantage on even-chance wagers. Understanding that distinction helps when considering how a single outcome outside the main groups alters expected returns, which is explained in the next section.
Does 0 Affect Even/Odd Bets?
Yes. Because 0 lies outside the even and odd sets, any even or odd wager is resolved as a loss when the wheel shows 0. This applies to all standard even-chance bets that depend on the numbers 1 to 36.
The effect goes beyond an isolated result. By being excluded from those bet groups, 0 reduces the true probability of winning even-chance bets compared with a 50/50 split. In a single-zero wheel the mathematical consequence of that exclusion produces a house edge of 2.70 percent. Where a second green pocket is present, the edge rises accordingly. Keeping this in mind clarifies why the 0 exists and how it shapes the game’s overall balance.
Why Does the 0 Exist in Roulette?
The 0 was introduced historically to change payouts and secure a margin for the house. Early versions of roulette paid out at the true odds, but adding the 0 altered the payoff structure so the casino would have a built-in advantage over time. That same purpose remains today: 0 ensures that not every possible spin is covered by common even-chance bets.
Beyond its mathematical role, 0 also provides a distinct visual and structural feature on the wheel and layout. It creates a clear focal point that separates the green pocket from the numbered red and black sequence. The presence of either a single 0 or both 0 and 00 determines the house edge and influences how players approach bets.
Knowing why 0 exists and how it is treated allows you to read the table and the odds with confidence. If you want to choose bets with a lower house advantage, consider how the single-zero wheel compares with other variants before placing stakes. In short, 0 is a deliberate part of roulette’s design that changes probabilities and keeps the game balanced in the casino’s favour.
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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.