The zero is the pocket that changes every even-money bet
When a player asks whether 0 is even in roulette, they are usually standing at a table looking at the red and black diamonds on the felt and trying to work out what happens to their outside bet when the ball lands in the green pocket. The short answer is that zero is not even, not odd, not red, and not black. It is a separate category, and it loses for every even-money wager placed on the table. That single pocket is the reason a bet on black does not pay at true odds even though there are 18 black numbers and 18 red ones.
The wheel does not treat zero as a number like the others for betting purposes. The numbers 1 through 36 are split evenly between red and black, and between odd and even. Zero sits outside both pairs. On a European wheel there is one zero; on an American wheel there is a zero and a double zero. Both are green, and both belong to the house on outside bets.
What a round looks like from buy-in to settlement
You buy in at the table, receive coloured chips that are unique to you at that table, and place them on the layout. The dealer spins the wheel in one direction and sends the ball travelling the other way. Once the ball drops, the dealer marks the winning number with a dolly, clears the losing bets, and pays the winners. The sequence is the same whether you bet a single number or a whole section of the felt.
The decision points happen before the spin, not during it. You choose which bets to place, how much to stake on each, and whether to spread your chips across several wagers or concentrate them on one. Once the ball is moving, nothing you do changes the outcome. The wheel has no memory of previous spins, and a number that has appeared three times in a row is no more or less likely to appear again than any other pocket.
Inside bets, outside bets, and where zero fits
Roulette bets divide into two families. Inside bets sit on the numbered grid and cover individual numbers or small groups of them. Outside bets sit around the perimeter and cover broad categories: red or black, odd or even, high or low, dozens, and columns. Zero belongs to neither colour, neither parity, and neither half of the range. Some tables offer a rule that returns half of an even-money stake when zero appears, but that is a specific table rule, not a universal one, and it is printed on the layout where it applies.
| Bet | What it covers | Where zero sits | How the edge changes |
|---|---|---|---|
| Red or black | 18 numbers of one colour | Loses on zero | Zero creates the gap between payout and true odds |
| Odd or even | 18 numbers of one parity | Loses on zero | Same gap as colour bets |
| High or low | 1-18 or 19-36 | Loses on zero | Same gap as colour bets |
| Straight up | One number | Zero is a number you can bet directly | Pays 35 to 1 against 36 or 37 losing pockets |
| Split, street, corner | Two, three or four numbers | Zero can be included in some combinations | Edge varies by the number of pockets covered |
The even-money bets all lose on zero, and that is precisely what gives the operator its mathematical advantage on those wagers. If the wheel had only 36 pockets and paid even money on a bet covering 18 of them, the bet would be fair. Add the zero and the bet still pays even money, but now it wins on 18 pockets and loses on 19. The house edge is the one extra losing pocket divided by the total number of pockets.
Why the wheel type changes the arithmetic
A European wheel has 37 pockets: the numbers 1 through 36 plus a single zero. An American wheel has 38: the same 36 numbers plus a zero and a double zero. The extra pocket does not change the payout on any bet; it only adds another losing outcome for outside bets and most inside bets. The same even-money bet therefore loses more often on an American layout than on a European one, because there are two green pockets working against it instead of one.
This is a structural difference, not a small detail. When you sit down at a table, the first thing to establish is which wheel you are playing, because every edge calculation that follows depends on it. The wheel type is usually printed on the table sign or visible in the layout itself: a single zero means European, a zero plus a double zero means American.
What the player controls and what the player does not
You control bet selection, stake size, how many spins you play, and when you leave the table. You do not control where the ball lands, and no sequence of bets changes the built-in advantage on any wager. A player who doubles their stake after a loss is not recovering ground; they are placing a larger bet with the same negative expectation attached to it. The edge on each individual bet is fixed by the wheel and the payout, not by the betting pattern.
What genuinely varies is the edge between different bets on the same table. A straight-up bet on a single number carries a different expected loss rate than an even-money bet, and both differ from the five-number bet available on some American layouts. Choosing bets with a lower house edge changes the rate at which money is expected to leave your stack over time; it does not make any outcome more likely on a given spin.
Where the zero appears in the payout schedule
Zero is a number you can bet directly. A straight-up bet on zero pays at the same rate as a straight-up bet on any other single number: 35 to 1. On a European wheel, that means you are paid 35 units for a bet that has one winning pocket and 36 losing ones. On an American wheel, the same bet has one winning pocket and 37 losing ones. The payout does not change between wheel types; the number of losing pockets does.
Zero can also be included in combination bets. A split covering zero and one, a street covering zero, one and two, or a corner that includes zero are all available on layouts where the numbering allows them. These bets pay at the standard rates for their type, and their edge follows the same arithmetic as any other inside bet: the payout is fixed while the number of pockets covered determines the true odds.
Procedural mistakes new players make at the table
The first common error is placing a bet after the dealer has called no more bets. The moment the ball begins to slow, the dealer closes the layout, and any chip that lands late is returned. The second is touching chips after the spin has started. Once a bet is down, it stays where it is until the dealer settles it. The third is confusing table chips with cash-value chips. The coloured chips you receive at the table must be exchanged at that same table before you leave; they do not carry value at the cage.
None of these mistakes changes the house edge, but each one disrupts the rhythm of the game and can lead to a dispute about what was wagered. The cleanest approach is to place all bets before the ball is released, keep your hands off the layout during the spin, and watch how the dealer pays winning bets before you touch anything.
FAQ
Does zero count as red or black in roulette?
No. Zero is green on both European and American wheels. It is excluded from every red or black bet, and a bet on either colour loses when zero appears unless the table offers a specific rule that returns part of the stake.
What is the payout if you bet on zero?
A straight-up bet on zero pays 35 to 1, the same as a straight-up bet on any other single number. The payout is fixed by the table rules, while the number of losing pockets depends on whether the wheel is European or American.
Why does zero give the house an edge on even-money bets?
An even-money bet covers 18 numbers and pays 1 to 1. On a European wheel there are 19 pockets that lose that bet: the 18 numbers of the opposite category plus the zero. The extra losing pocket is the mathematical advantage the operator holds.
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This article is general information about how these mechanics work. It is not legal advice and not a recommendation to gamble or to use any particular operator. Availability and legality differ by jurisdiction — check the rules that apply where you are.