The wheel and the layout are two different counts
A visitor walking up to a roulette table in the UK sees two things that both look like they contain numbers: the spinning wheel, and the printed betting layout on the felt. They are not the same object, and they do not carry the same set of positions. The question "how many numbers" usually means the wheel, but the table layout includes extra betting areas that are not numbers on the wheel at all.
On the wheel itself, the standard layout used across most UK tables has 37 pockets. Those pockets are numbered 0 through 36. The zero is green, and the numbers 1 through 36 alternate between red and black. This 37-pocket wheel is the European arrangement, and it is the one a player is most likely to encounter when sitting down at a UK table.
The printed layout on the felt shows those same 37 numbers arranged in a grid, but it also carries a set of outside betting boxes: red, black, odd, even, low, high, dozens and columns. Those boxes are bets on groups of numbers, not additional numbers. So the honest answer has two parts: the wheel has 37 numbered pockets, and the table layout has 37 numbered positions plus the group-bet areas.
Why some tables show 38 pockets
Not every wheel in the world carries 37 pockets. The American arrangement adds a double zero, producing 38 pockets numbered 0, 00 and 1 through 36. The extra pocket is also green. A player who has seen both wheels will notice the difference immediately: the American layout has an extra zero position at the top of the number column on the felt, and the wheel has an extra green slot.
The presence of the double zero is not a cosmetic difference. The extra pocket changes the arithmetic of every bet on the table, because it adds one more losing position to the wheel without adding any new winning numbers for the player's chosen bet. A table that uses the 37-pocket European wheel and a table that uses the 38-pocket American wheel are running different games, even though the betting layout looks nearly identical.
| Feature | European wheel | American wheel |
|---|---|---|
| Numbered pockets | 37 | 38 |
| Zero pockets | 1 (single zero) | 2 (single and double zero) |
| Number range | 0 to 36 | 0, 00, 1 to 36 |
| Effect on house edge | Lower edge for the same bet | Higher edge for the same bet |
The table above is the single most important comparison for a player trying to read a roulette table correctly. If the wheel has a 00 pocket, every bet on the table carries a larger built-in advantage for the house than the same bet on a single-zero wheel. The player does not need to memorise the exact edge figures to act on this: the wheel with two zeros is the more expensive game.
How the zero changes the maths of a bet
Roulette payouts are built as if the zero did not exist. A straight-up bet on a single number pays 35 to 1, which is the fair price for a wheel with 36 pockets. On a 37-pocket wheel, the player's number covers 1 pocket out of 37, but the payout is still calculated as if the wheel had 36. That gap between the payout and the true odds is the house edge.
The same logic applies to every bet on the table. A red bet pays even money, but red does not occupy exactly half the wheel, because the zero is green. On the European wheel, 18 red numbers sit among 37 pockets, so the bet wins on 18 positions and loses on 19. On the American wheel, the same 18 red numbers sit among 38 pockets, so the bet loses on 20 positions. The payout has not changed, but the losing positions have increased.
This is why the wheel type matters more than the table's country of origin. A player in the UK who finds a table with a double-zero wheel is playing the same arithmetic as a player in any other country with that wheel. The location does not determine the edge; the wheel does.
Reading the table before you sit down
Before buying in, a player can answer the "how many numbers" question in about ten seconds by looking at two places. First, look at the wheel itself and count the green pockets. One green pocket means 37 numbers. Two green pockets means 38 numbers. Second, look at the top of the number grid on the felt. A single-zero table shows 0 at the head of the column. A double-zero table shows 0 and 00 side by side.
The table limits are also printed on the felt or on a sign at the table. Those limits state the minimum and maximum for inside and outside bets separately. A player who wants to know what a bet will cost does not need to ask a dealer; the information is on the layout. The minimum for outside bets is often higher than the minimum for inside bets, because outside bets pay even money or 2 to 1 and have a different risk profile for the operator.
Buying in follows a fixed sequence. The player places cash on the table, never into the dealer's hand. The dealer spreads the cash, counts it, and exchanges it for roulette chips. On many tables, each player receives a distinct chip colour so that bets on the layout can be traced back to the right person. The value of each coloured chip is set at the buy-in and is printed on the chip or shown on a marker.
The sequence of a round
A round of roulette moves through four phases. First, the dealer opens betting. Players place chips on the layout. Second, the dealer closes betting, usually with a spoken call or a hand motion. Third, the ball is spun in the opposite direction to the wheel's rotation. Fourth, the ball drops into a pocket, the dealer marks the winning number on the layout, and losing bets are cleared before winning bets are paid.
The decision points for the player are all in the first phase. A player can bet on a single number, a split between two adjacent numbers, a street of three, a corner of four, a six-line, or any of the outside group bets. Each bet has its own payout and its own probability of winning, but on a given wheel every bet carries the same house edge except for one notable difference: on the American wheel, the five-number bet covering 0, 00, 1, 2 and 3 carries a higher edge than the rest of the table.
The settled bet is paid according to the printed payout, not according to what the player believes the bet should pay. A straight-up win pays 35 to 1. A split pays 17 to 1. A street pays 11 to 1. A corner pays 8 to 1. A six-line pays 5 to 1. A dozen or column pays 2 to 1. An even-money bet pays 1 to 1. These payouts are fixed by the game and do not change between operators.
Inside and outside bets compared
The roulette layout divides naturally into two betting zones. Inside bets are placed on the numbered grid and cover individual numbers or small groups. Outside bets sit around the grid and cover large groups of numbers. The distinction matters because it changes the shape of the result: inside bets win less often but pay more when they do, while outside bets win more often but pay less.
| Bet type | What it covers | Payout | Win frequency on a 37-pocket wheel | House edge |
|---|---|---|---|---|
| Straight-up | 1 number | 35 to 1 | 1 in 37 | Same as all single-zero bets |
| Split | 2 numbers | 17 to 1 | 2 in 37 | Same as all single-zero bets |
| Street | 3 numbers | 11 to 1 | 3 in 37 | Same as all single-zero bets |
| Corner | 4 numbers | 8 to 1 | 4 in 37 | Same as all single-zero bets |
| Six-line | 6 numbers | 5 to 1 | 6 in 37 | Same as all single-zero bets |
| Red or black | 18 numbers | 1 to 1 | 18 in 37 | Same as all single-zero bets |
| Dozen or column | 12 numbers | 2 to 1 | 12 in 37 | Same as all single-zero bets |
The table shows why the choice between inside and outside is a choice about variance, not about edge. On a single-zero wheel, all these bets carry the same house edge. The difference is the pattern of wins and losses. A straight-up bet will lose far more often than a red bet, but its occasional win is much larger. A player choosing between them is choosing how lumpy the session will be, not how favourable the game is.
Procedural mistakes that cost new players
The first mistake is betting after the dealer has closed betting. Once the ball is in motion and the dealer calls no more bets, chips placed on the layout will be returned or treated as void depending on the house procedure. A player who wants a bet to stand must place it before the close, and the close can come quickly on a busy table.
The second mistake is reaching onto the layout after the ball has dropped. Winning bets are paid in a specific order, and the dealer needs a clear view of the felt. A hand in the way can lead to a dispute about which chips belong to whom, and on some tables touching another player's chips is treated as a serious breach of table etiquette.
The third mistake is confusing the coloured chips with cash-value chips. Roulette chips issued at the table are usually valid only at that table. They must be exchanged back at the table before the player leaves. Walking away with them and trying to use them at another table or at the cashier will not work, because their value is tied to the buy-in at the original table.
What the table cannot tell you
The felt shows the numbers, the payouts and the limits. It does not show the house edge, and it does not show the long-run expected loss. Those figures are derived from the wheel type and the payout schedule, and they are the same for every player at the table regardless of betting pattern. No sequence of bets changes the number of pockets on the wheel or the payout printed on the felt.
A player who wants the exact edge figure for a specific bet can derive it from the wheel and the payout, or consult the game information panel where the operator provides one. The important structural fact is already visible on the wheel: one zero means 37 pockets, two zeros means 38, and the extra pocket raises the house edge on every bet without changing any payout.
FAQ
Does a UK roulette table always use the European wheel?
Not always. The European 37-pocket wheel is the common arrangement, but a UK venue can offer a double-zero wheel. The player should check the wheel and the felt before buying in, because the number of zero pockets changes the house edge on every bet.
Are the outside betting boxes counted as numbers?
No. The outside boxes are bets on groups of numbers, not additional numbered positions. The wheel has 37 numbered pockets on a single-zero table, and the layout has 37 numbered positions plus the group-bet areas.
Why does the payout on a straight-up bet not match the true odds?
The payout is 35 to 1, but a single number on a 37-pocket wheel has a 1 in 37 chance of winning. The gap between the payout and the true odds is the house edge, and it exists on every bet because the zero pocket is not covered by the standard even-money or number bets.
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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.