Start by reading the wheel, not the felt
Before you put a chip down, look at the wheel itself. If you count 38 pockets around the rim, you are at an American-layout table. The numbers run 0 through 36, and there are two green pockets: a single zero and a double zero. That second green pocket is not decoration. It is the single biggest difference between one roulette table and another, and it quietly changes what every bet on the layout is worth.
A European wheel has 37 pockets: the same 0-36 plus one green zero. An American wheel adds the double zero, bringing the total to 38. The wheel is the game. The felt is just a map of the wheel, and every bet you can place is a bet on where the ball lands among those pockets.
How a round runs
You buy in at the table, and the dealer exchanges your cash for roulette chips. These are not the standard value chips used at other tables; they are colour-coded to you so the dealer can tell your bets apart from the next player's. You tell the dealer what denomination you want, and the chips are worth that amount only at this table. When you are done, you cash them back at the same table, not at the cage.
A round moves through a fixed sequence. The dealer opens betting. You place chips on the layout, and you may keep placing them until the dealer announces that no more bets are accepted. The dealer spins the wheel in one direction and sends the ball travelling the other way around the outer track. When the ball loses speed, it drops into the pockets, bounces, and settles. The dealer marks the winning number on the layout, clears the losing bets, and pays the winners. Then the next round begins.
Your only decision in the round is what to bet before the spin. Once the ball is moving, nothing you do changes the outcome. Roulette is a game of selection, not of play. There is no skill element in the spin itself, only in how you choose to spread your chips across the numbers and groups.
What the 38 pockets do to the odds
On a fair 38-pocket wheel, every pocket has the same chance of catching the ball: 1 in 38. If the game paid every winning bet at the true odds, a straight-up bet on a single number would pay 37 to 1, because you win on one pocket and lose on the other 37. But the table pays 35 to 1. That gap between the true odds and the payout is the house edge. The house keeps that difference on every spin, whether you win or lose, because the payout structure is fixed while the wheel has more losing pockets than the payout assumes.
The double zero widens that gap. On a 37-pocket European wheel, a straight-up bet pays 35 to 1 against 36 losing pockets. On the 38-pocket American wheel, the same bet pays 35 to 1 against 37 losing pockets. The player faces one additional way to lose on every bet, and no bet on the layout escapes it. The house edge and the return to player sum to 100% for the same bet under the same rule set, so a higher edge means a lower long-run return on every unit wagered.
Bet types and how their edges differ
Every roulette bet is a wager on a set of numbers. The payout shrinks as the set grows, but the house edge does not move in a straight line across all bets. Some bets cover more pockets and pay less; others cover few pockets and pay more. What matters is how the payout compares with the true odds of the covered set. The table below compares the main bet categories on a 38-pocket American wheel.
| Bet type | Pockets covered | Payout | What it means on a 38-pocket wheel |
|---|---|---|---|
| Straight up | 1 number | 35 to 1 | Pays as if there were 36 losing pockets; there are 37, so the gap is widest here |
| Split | 2 adjacent numbers | 17 to 1 | True odds are 18 to 1 against; the payout is short by the same structural gap |
| Street | 3 numbers in a row | 11 to 1 | True odds are 11.67 to 1 against; the rounding hides part of the edge |
| Corner | 4 numbers | 8 to 1 | True odds are 8.5 to 1 against; the payout is short on every spin |
| Six line | 6 numbers | 5 to 1 | True odds are 5.33 to 1 against; the gap narrows but does not close |
| Dozens / columns | 12 numbers | 2 to 1 | True odds are 2.17 to 1 against; a fixed shortfall on a large set |
| Red / black, odd / even, 1-18 / 19-36 | 18 numbers | 1 to 1 | 18 winning pockets against 20 losing ones, because both zeros sit outside these bets |
Notice the last row. The even-money bets cover 18 pockets, but the wheel has 20 pockets that lose them: the 18 numbers of the opposite colour or parity, plus the single zero and the double zero. That is why the house edge on those bets is higher on an American wheel than on a European one. The extra green pocket is a losing pocket for every even-money bet, and it is a losing pocket for every other bet too.
The five-number bet deserves its own warning. On an American layout you can bet on 0, 00, 1, 2 and 3 as a single wager. It pays 6 to 1, but the true odds against it are 6.6 to 1. No other standard bet on the layout carries a gap that wide. If you are choosing where to put a chip and you want the least unfavourable option, the five-number bet is the one to leave alone.
Reading the table minimums and the layout
Table minimums are posted at the table, usually on a small sign. The minimum applies to the total of your bets per spin, not to each chip. Some tables also post a maximum, and the maximum differs by bet type. A straight-up maximum and an even-money maximum are not the same number. If you want to spread across many numbers, check how the table counts your total action before you place the first chip.
The layout itself prints the payouts next to each bet area. Read them as the table's own terms. If the layout says a street pays 11 to 1, that is the payout you will receive, and it is fixed before the spin. Nothing about the spin changes it.
Where the strategy question ends
Roulette has no decision that changes the house edge after you sit down. You cannot influence the ball, and no sequence of past spins tells you what the next spin will do. Each spin is independent. A number that has not appeared for fifty spins is not due; the wheel has no memory, and the 38 pockets do not rebalance themselves to catch up.
What you can choose is which bets to place and how much of your session bankroll to commit per spin. Choosing a bet with a smaller gap between true odds and payout changes the expected rate of loss, not the direction of it. The house edge remains on every bet, every spin. A player who understands that can still enjoy the game, but they are not under any illusion about what the 38 pockets are doing.
Procedural mistakes new players make
The first mistake is treating roulette chips like cash chips. Roulette chips have no value at any other table and no printed denomination. If you walk away from the table with them, you have left value behind until you return to that same table and cash them. Always colour up before you leave: ask the dealer to exchange your roulette chips for value chips, then take those to the cage.
The second mistake is betting after the dealer has called no more bets. Once the ball is in motion and the call is made, any chip that touches the layout late will be returned or treated as void, and repeated late betting will draw attention for the wrong reason. Place your bets while the table is open, and keep your hands off the layout once the spin begins.
The third mistake is misreading the even-money bets as a coin flip. They look like 50-50 propositions because they pay 1 to 1, but on a 38-pocket wheel they are not. The two green pockets sit outside red, black, odd, even, low and high. If you want a bet that behaves closer to a coin flip, you need a wheel without the double zero, and even then the single zero keeps the edge on the house side.
FAQ
Does a 38-slot wheel always mean American roulette?
Yes. The 38-pocket layout is the American configuration: numbers 0-36 plus a single zero and a double zero. The 37-pocket European layout has one zero. The wheel type is fixed by the physical wheel at the table, so read the wheel before you buy in.
Is the double zero the only difference between American and European roulette?
It is the defining difference, but table rules can differ too. Some European tables use a rule that returns half of an even-money bet when the ball lands in zero, which changes the edge on those bets specifically. That rule is not standard on American layouts, so treat the wheel and the posted rules as a package.
Which bet on a 38-slot wheel gives the player the best chance of a payout?
The even-money bets cover 18 of the 38 pockets, so they pay out more often than any other standard bet, but they still lose on 20 pockets. A higher frequency of small payouts is not the same as a better expected result. The five-number bet has the widest gap between payout and true odds, so it is the least favourable standard option on the layout.
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