The Wheel You Sit Down To
You walk up to a roulette table, exchange cash for coloured chips, and look at the wheel. The first thing that matters is not your lucky number. It is whether the wheel has one zero or two. That single pocket changes the arithmetic of every bet you can place, so the count you need is not just a piece of trivia. It is the first decision you make before you put a chip down.
A European wheel carries 37 pockets: the numbers 1 through 36, plus a single zero. An American wheel carries 38 pockets: the same 1 through 36, plus a zero and a double zero. The numbered pockets are not arranged in numerical order around the wheel. They are distributed so that high and low numbers, red and black, odd and even alternate in a pattern that has been standardised for each wheel type.
The zero pockets are green. The numbered pockets alternate red and black. The zeros are not odd or even, not high or low, and not red or black. That matters because every outside bet that covers red, black, odd, even, low or high loses when the ball lands in a zero pocket. On an American wheel, it loses on two pockets instead of one.
Why the Extra Zero Changes the Odds
Roulette pays winning bets as if the zeros did not exist. A straight-up bet on a single number pays 35 to 1, but on a European wheel there are 37 pockets, not 36. The house keeps its advantage because the payout is calculated against 36 possible numbers while the wheel has 37. On an American wheel the same 35-to-1 payout is measured against 38 pockets.
House edge and RTP are complements: they sum to 100% for the same bet under the same rule set. The house edge is the mathematical advantage the operator holds on a given game, expressed as a percentage of each wager. RTP is the theoretical percentage of total wagered money a game returns to players over a very large number of spins. Neither figure is a per-session guarantee. A single evening can end far above or far below the average, because roulette is a high-variance game with many independent spins.
The practical consequence is that the American layout gives the operator a larger built-in advantage on most bets than the European layout does. The extra pocket does not change how the game is played, but it changes the expected rate of loss on every spin. When you have a choice of tables, the wheel type is the first thing to check. The table layout usually prints the wheel type or shows the zero pockets on the felt, and the information panel on an online game states it before you place a bet.
The Sequence of a Round
A round of roulette runs through a fixed sequence, and knowing it keeps you from making procedural mistakes that cost time or money.
First, you buy in. At a live table you place cash on the felt and the dealer exchanges it for roulette chips. These chips have no value printed on them and are only valid at that table. You assign their value when you buy in, and you must cash them in at the same table before you leave. At an online table the cashier screen handles the exchange, and your balance is shown in ordinary currency units.
Second, the betting window opens. You place chips on the layout. Inside bets sit on individual numbers or small groups of numbers. Outside bets sit in the boxes around the numbered grid and cover broad categories. You may place multiple bets in the same round.
Third, the dealer or the software closes betting. At a live table the dealer announces that no more bets may be placed, usually as the ball is released or just before. Online, the betting timer ends and the spin begins.
Fourth, the ball lands. The dealer marks the winning number, removes losing bets, and pays winners. Online, the software does this automatically and credits your balance.
Fifth, the next round begins. The layout clears and betting reopens. At a live table, never touch your chips after the dealer has called no more bets, and never place a late bet while the ball is in motion. Both are procedural mistakes that will get a bet refused or, at a live table, draw a correction from the dealer.
Bet Types and How Their Edges Differ
Roulette bets fall into two families. Inside bets cover specific numbers or small clusters and pay more when they win. Outside bets cover large categories and win more often but pay less. The key fact is that different bets on the same table can carry materially different edges, especially on an American wheel.
| Bet | What it covers | Payout | How the zeros affect it |
|---|---|---|---|
| Straight up | One single number | 35 to 1 | Loses on zero and double zero |
| Split | Two adjacent numbers | 17 to 1 | Loses on zero and double zero |
| Street | Three numbers in a row | 11 to 1 | Loses on zero and double zero |
| Corner | Four numbers meeting at a corner | 8 to 1 | Loses on zero and double zero |
| Six line | Six numbers in two rows | 5 to 1 | Loses on zero and double zero |
| Red, black, odd, even, low, high | 18 numbers each | 1 to 1 | Loses on zero and double zero |
| Dozens and columns | 12 numbers each | 2 to 1 | Loses on zero and double zero |
The American wheel adds one exception to the pattern. A five-number bet covering 0, 00, 1, 2 and 3 pays 6 to 1, but it covers five pockets while being paid as if it covered fewer. That makes it the worst single bet on the American layout, with a larger house edge than any other standard wager. It does not exist on a European wheel. If you want to keep your expected loss as low as possible, avoid that bet entirely and prefer the European layout when it is available.
Some European tables offer a rule called la partage or en prison on even-money outside bets. When the ball lands on zero, the player either receives half the bet back or the bet is held for the next spin. This rule changes the edge on those specific outside bets only, and it is printed on the table layout where offered. It never applies to inside bets.
What Strategy Charts Can and Cannot Do
Roulette has no decision that changes the built-in edge of a bet after you place it. Unlike blackjack, where basic strategy charts derive from the specific rule set in use, roulette offers no play decision that alters the probability of the next spin. The wheel has no memory, and no sequence of past results changes the odds of the next number.
What you control is bet selection, the wheel type you sit at, and how long you play. Choosing a European wheel over an American one changes the expected rate of loss. Choosing outside bets over the five-number bet does the same. Choosing a shorter session reduces the total amount wagered. None of this changes the fact that the house edge stays with the operator on every spin.
Progression systems that raise or lower stakes after wins or losses redistribute outcomes across a session. They do not remove the edge. A long losing streak is possible on any wheel, and a system that doubles bets after losses can exhaust a bankroll quickly without improving the expected result. Treat any chart or system sold as a roulette strategy as a description of bet sizing, not a change to the game's mathematics.
Procedural Mistakes That Cost New Players
The errors that hurt new roulette players are almost never about picking the wrong number. They are procedural, and they are easy to avoid once you know they exist.
The first is sitting at the wrong wheel. A player who does not check whether the table is European or American has already accepted a larger house edge before placing a single bet. The wheel type is printed on the layout or shown in the game information panel, and it takes seconds to check.
The second is betting late. At a live table, once the dealer calls no more bets, any chip placed on the layout is a late bet. The dealer will refuse it or push it back. Online, the timer simply closes and the bet is not placed. Late bets are not a strategy; they are a way to lose control of what you intended to wager.
The third is misunderstanding the zero. New players sometimes treat zero as an outside bet that can be covered by red, black, odd or even. It cannot. The zero pockets are green and sit outside those categories. On an American wheel, the double zero compounds the problem. If you want to cover the zeros, you must bet on them directly or use a bet that includes them, and that bet carries its own edge.
The fourth is leaving a live table with roulette chips still in hand. Roulette chips are not cash and are not valid at other tables or at the cashier. They must be exchanged at the table where they were issued. A player who walks away with them has turned a table credit into a souvenir until they return to the same table.
FAQ
Why does an American roulette wheel have more numbers than a European wheel?
The American layout adds a double zero pocket to the 36 numbered pockets and the single zero. The numbered sequence is the same, but the extra green pocket increases the house edge on most bets because payouts are still calculated as if the zeros were not present.
Do the zeros count as numbers on a roulette wheel?
Yes. The wheel has 36 numbered pockets plus the zero pockets. On a European wheel the total is 37 pockets, and on an American wheel it is 38. The zeros are pockets on the wheel and outcomes in every spin, but they do not belong to any of the outside categories such as red, black, odd, even, low or high.
Does the number of pockets change how much a winning bet pays?
The payout for a given bet is the same on both wheel types. A straight-up bet pays 35 to 1 on either layout. What changes is the probability of winning, because the American wheel has one extra pocket that loses on nearly every bet. The same payout against worse odds means a larger house edge.
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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.