Roulette is a classic casino game with simple rules and clear payouts. Look closely at the wheel and the green zero stands out, and for good reason: it changes how many common bets are resolved.
If you’ve wondered whether zero is even or odd, how it affects winning bets, or why it exists at all, this article will clear that up and give practical context so you understand the gameplay better.
Keep reading to see how zero shapes outcomes and what that means for the bets you place.
What Does the Zero Mean on a Roulette Table?
The green zero is a deliberate feature of roulette and a key part of how the game is structured. All other numbers on the wheel are red or black; zero is green so it is visually distinct and treated differently by the rules.
Its effect is straightforward: when the ball lands on zero, many common outside bets such as red/black or even/odd are lost. That distinction is what creates the casino’s edge over time, and it’s why tables with more zeroes raise that edge further.
European-style wheels have a single zero, and American-style wheels commonly include two zeroes. Each additional zero increases the proportion of spins that remove outside-bet wins, which is why the number of zeroes matters when comparing tables.
Understanding that zero stands apart helps explain why certain bets pay what they do and why the game’s probabilities are set up the way they are.
Is Zero an Even or Odd Number in Roulette?
In roulette rules, zero is explicitly not classed as even or odd. Although zero is an even number in pure mathematics, the game’s betting categories do not include it in either group.
When you place an even or odd bet at the table, the wager applies only to the specific numbers defined by the rules. Zero is excluded, so if the ball stops on zero those bets lose. This rule is one of the simplest ways zero influences outcomes and the house edge.
How Are Even and Odd Numbers Defined in Roulette?
On the roulette table, the numbers separate into two clear groups:
- Even numbers are those divisible by two, such as 2, 4, 6, up to 36.
- Odd numbers are those that are not divisible by two, like 1, 3, 5, up to 35.
- Zero is treated outside of both lists and is not included in even or odd bets.
That separation is why outside bets, such as even/odd, have slightly less than a 50/50 chance of success on each spin. The presence of zero means there is always at least one outcome that causes those bets to lose, which contributes directly to the casino’s edge.
Why Is Zero Treated Differently in Roulette?
Zero exists to give roulette a predictable margin for the operator while keeping the rest of the number set balanced between red and black, even and odd. It is not counted as red or black, nor as odd or even, so it sits outside the common outside bets. By excluding zero from those bets the game ensures a small advantage for the house, which is standard practice across roulette variants.
This design choice also affects strategy and player expectations in a few clear ways:
- It explains why even-money and other outside bets do not pay true 1:1 odds, since zero reduces their probability of success.
- It creates a measurable difference in house edge between single-zero and double-zero wheels, making single-zero wheels generally kinder to players.
- It influences the practical value of different bet types and how players compare tables and rules.
Understanding zero’s role helps you interpret payouts and assess which wheel or bet type suits your approach, while keeping the game’s built-in advantage in mind.
How Does Zero Affect Your Roulette Bets?
Zero removes many outside bets from contention when it appears. Bets on red/black, even/odd, and high/low are all lost if the ball lands on zero, because those bets explicitly cover only the numbered red and black sections.
Inside bets behave differently: a straight-up bet on a single number can include zero, and if that number comes up it pays according to the table’s odds. The probability of zero appearing as a specific single number is the same as for any other single slot on that wheel, so payouts reflect that uniform chance.
Keep this distinction in mind when assessing risk and reward. Outside bets give more frequent, smaller wins when zero does not intervene, while inside bets offer larger returns on the less likely event of a single number being selected.
Common Misconceptions About Zero in Roulette
There are a few persistent misunderstandings around zero. One is the idea that zero counts as even for betting purposes — it does not. Another is the belief that previous spins influence when zero will appear next; in roulette each spin is resolved independently from prior spins.
Zero is not a trick but a rule-based element of the game. Its presence is what creates the house edge and shapes the available betting options. Recognising this helps separate myth from the practical facts of play.
If you are comparing tables or thinking about bet types, remembering how zero is treated will keep your decisions grounded in how the game actually operates.
Summary: What You Should Know About Zero on the Roulette Table
Zero stands alone and is not counted as even or odd. It is excluded from red/black and outside bets, which is why those bets can lose when zero appears.
The presence of zero creates the operator’s edge; more zeroes mean a larger edge. Inside-number bets do include zero as a possible outcome and pay in line with the probability of a single number landing.
No betting system can change how zero is treated by the rules. Play with clear expectations, set sensible limits, and choose bets that fit the experience you want. If you’d like, browse our recommended tables to see how single- and double-zero wheels compare and pick the option that suits you best.
**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.