The Wheel Is the Whole Game Before the Ball Drops
You sit down, buy in, and the first thing you should do is look at the wheel itself. Not the felt, not the screen, not the dealer's stack. The wheel. Because the number of pockets on that wheel is the single fact that determines what the game costs you to play. A European wheel carries 37 pockets. An American wheel carries 38. That one extra pocket is not a cosmetic difference. It is the difference between two games that look identical but charge you differently for every spin.
The question "how many slots in a roulette wheel" sounds like a trivia question, but it is really a cost question. The answer tells you which game you are sitting at before you place a single chip.
What Counts as a Slot
A slot, or pocket, is one of the numbered compartments around the wheel's rim. The ball must come to rest in exactly one of them. On both main wheel types, the pockets are numbered 0 through 36. That is 37 numbers. The difference is that an American wheel adds a second zero pocket, marked 00, bringing the total to 38 physical slots.
The colours follow a fixed pattern. Zero and double zero are green. The numbers 1 through 36 alternate red and black. The order of numbers around the wheel differs between European and American layouts, which matters only if you study wheel mechanics or dealer signatures. For the purpose of understanding the game, the count is what matters.
| Wheel type | Pockets | Zero pockets | Number range | Effect on the player |
|---|---|---|---|---|
| European | 37 | 1 (single zero) | 0-36 | Lower house edge on most bets |
| American | 38 | 2 (0 and 00) | 0-36 | Higher house edge on most bets |
Some venues in Europe and elsewhere also offer French roulette, which uses the same 37-pocket wheel as European roulette but adds specific rules for even-money bets when zero lands. The wheel itself is unchanged; the table rules around it differ.
Why the Extra Slot Changes What You Pay
Roulette pays winning bets as if the zero pockets did not exist. A straight-up bet on a single number pays 35 to 1. If the wheel had 36 pockets and no zero, that payout would make the game perfectly even: 35 losing numbers against one winning number paying 35 units. The zero pocket is what tilts the game toward the house.
On a European wheel, the ball can land in any of 37 pockets, but a winning single-number bet is still paid as if there were only 36. The house edge is the difference between the true odds and the payout odds. On an American wheel, there are 38 pockets, so the same 35-to-1 payout leaves the house with a larger share. The double zero does not change how much a winning bet pays. It changes how often a bet wins.
The same logic applies to every bet on the layout. Even-money bets such as red or black pay 1 to 1, but the zero pockets are neither red nor black. On a European wheel, the ball lands on zero roughly one spin in 37. On an American wheel, zero or double zero appears roughly one spin in 19. The even-money bettor loses on every one of those spins.
Reading the Table Before You Buy In
The wheel count is always visible. You do not need to ask the dealer or search the operator's help pages. Look at the wheel. If you see a 00 pocket, you are at an American layout. If the wheel shows a single zero and no 00, you are at a European layout. On a live-dealer online table, the same visual check applies through the stream. On a software table, the game information panel states the wheel type, usually under a rules or help tab.
Buy-in procedure is the same on both wheels. You place cash or a casino cheque on the table, never directly into the dealer's hand in most venues. The dealer exchanges it for roulette chips, which differ from the chips used at other table games. Roulette chips are often unmarked with a denomination and coloured per player, so two players at the same table can hold chips that look alike but belong to different buy-ins. Cash them out at the table before you leave; they have no value at the cage or at another table.
The Sequence of a Round
A round moves through four phases. First, the dealer clears the previous round's losing bets and pays winners. Second, the dealer opens betting, usually with a hand gesture or a verbal call. Third, players place chips on the layout. Fourth, the dealer spins the wheel, launches the ball in the opposite direction, and eventually calls no more bets. The ball drops, the dealer marks the winning number, and the cycle repeats.
Each phase has a decision point for you. During the betting window, you decide which bets to place and how much to stake on each. When the dealer calls no more bets, your decision is locked; reaching toward the layout after that call is the most common procedural mistake new players make. The dealer will wave you off, and in some venues a late bet is returned or refused.
The second common mistake is touching your chips after the result is announced. Once the dealer places the marker on the winning number, the layout is frozen. Wait for the dealer to clear losing bets before you collect anything.
The third is mixing up your own chips. Because roulette chips are colour-coded per player, keep your stack in front of you and do not borrow or combine chips with another player. At cash-out, the dealer converts your roulette chips back into standard value chips.
Bet Types and What They Cost
Roulette bets fall into two broad groups. Inside bets cover specific numbers or small groups of numbers. Outside bets cover large categories such as red or black, odd or even, high or low, dozens, and columns. Inside bets pay more because they win less often. Outside bets pay less because they win more often. Neither group is better in an absolute sense; the house edge on most bets is the same on a given wheel, with one exception on the American layout.
The exception is the five-number bet, also called the basket, which covers 0, 00, 1, 2 and 3. It exists only on American wheels and carries a higher house edge than the other standard bets. It is the worst bet on the layout from a cost-per-wager standpoint.
| Bet | Covers | Payout | Wheel where it exists | House edge relative to other bets on the same wheel |
|---|---|---|---|---|
| Straight-up | 1 number | 35 to 1 | Both | Standard for the wheel |
| Split | 2 numbers | 17 to 1 | Both | Standard for the wheel |
| Street | 3 numbers | 11 to 1 | Both | Standard for the wheel |
| Corner | 4 numbers | 8 to 1 | Both | Standard for the wheel |
| Five-number basket | 0, 00, 1, 2, 3 | 6 to 1 | American only | Higher than standard |
| Six-line | 6 numbers | 5 to 1 | Both | Standard for the wheel |
| Red or black | 18 numbers | 1 to 1 | Both | Standard for the wheel |
| Odd or even | 18 numbers | 1 to 1 | Both | Standard for the wheel |
| Dozen or column | 12 numbers | 2 to 1 | Both | Standard for the wheel |
On a European wheel, the standard house edge applies uniformly to all bets in the table above. On an American wheel, the same uniformity holds except for the basket bet, which is worse. The zero pockets are the reason the edge exists at all. The double zero is the reason the American edge is larger than the European one.
What a Strategy Chart Cannot Do for Roulette
In games like blackjack, a basic-strategy chart derives from the exact rule set in use: deck count, dealer stand rules, doubling and splitting permissions. Roulette has no equivalent decision chart, because no decision you make changes the odds. The wheel has a fixed number of pockets, the payouts are fixed, and the house edge is built into that relationship. Betting red instead of black, or spreading chips across six numbers instead of one, changes the shape of your session but not the long-run cost per unit wagered.
What you can control is which wheel you sit at, which bets you avoid, how many spins you play, and how much you stake per spin. The wheel count is the first of those controls, and it is the only one that changes the underlying arithmetic. If a venue offers both wheel types, the 37-pocket layout is the cheaper game to play for the same bets.
FAQ
Does a roulette wheel have 36, 37 or 38 slots?
A European wheel has 37 slots: the numbers 0 through 36. An American wheel has 38: the same numbers plus a 00 pocket. The 36-number count comes from ignoring the zero pockets, which is how the payout odds are calculated, but the physical wheel includes them.
Which roulette wheel is better for the player?
The 37-pocket European wheel is cheaper to play than the 38-pocket American wheel for the same bets, because the single zero gives the house a smaller edge than a zero plus a double zero. The wheel type is stated in the game information panel on software tables and visible on the wheel itself at live tables.
Why does the extra zero matter if the payouts are the same?
Payouts are fixed at odds that ignore the zero pockets. A straight-up bet pays 35 to 1 whether the wheel has 37 or 38 slots. The extra pocket means the winning number appears slightly less often, so the same payout buys a smaller chance of winning. The house keeps that difference on every spin, win or lose.
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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.