You're not betting on a number. You're betting on a pocket
Most people sit down at a roulette table thinking they have to guess the winning number. That's the most famous bet, but it's only one of many, and it's not even the one most players make. Roulette is really a game about predicting where a small ball will land on a spinning wheel, and the betting layout lets you express that prediction in dozens of different ways, from a single number to a whole block of them at once. The first thing to understand is that every bet on the table pays according to how unlikely it is, and the house keeps its edge on every one of them.
The equipment is simple. A wheel sits at one end of the table, with numbered pockets around its rim. A dealer, sometimes called a croupier, spins the wheel in one direction and sends a ball travelling the other way around a track. The ball loses speed, drops onto the wheel, bounces between the frets, and settles into one pocket. That pocket decides every bet on the table.
The two wheel types and why the difference matters
Before you buy in, look at the wheel. Roulette comes in two main layouts, and the difference is not cosmetic. A European wheel has 37 pockets, numbered 0 through 36, with a single zero. An American wheel has 38 pockets, because it adds a double zero alongside the single zero. The numbers are arranged differently on the two wheels, but the betting layout looks similar, so the surest way to tell them apart is to look for the double zero pocket on the wheel itself.
That extra pocket changes the mathematics of every bet on the table. The house edge on an American layout is higher than on a European layout for the same bet, because the zero pockets are not covered by the standard outside bets like red, black, odd, or even. When the ball lands in a zero, those bets lose. On an American wheel, there are two pockets that do that instead of one. The comparison is worth seeing side by side.
| Feature | European wheel | American wheel |
|---|---|---|
| Pockets | 37 | 38 |
| Zero pockets | Single zero (0) | Single zero (0) and double zero (00) |
| Effect on outside bets | One pocket defeats red/black, odd/even, high/low | Two pockets defeat red/black, odd/even, high/low |
| House edge on the same bet | Lower | Higher |
This does not mean a European wheel is a winning proposition. The house edge is still there. It means the expected rate of loss on the same wager is lower on a European layout than on an American one. If you have a choice of tables, the wheel with fewer zero pockets is the less expensive way to play the same game.
The sequence of a round, from buy-in to settlement
A roulette round moves through a fixed sequence. Knowing it before you sit down prevents the most common procedural mistakes, which are almost always about touching chips at the wrong time or putting them in the wrong place.
You begin by buying in. Roulette does not use the same chips as the rest of the casino. At the table, you hand cash to the dealer and receive wheel chips, which are coloured discs unique to that table, often with no denomination printed on them. Each player gets a different colour so the dealer can tell whose bets are whose. You state the value you want per chip, and the dealer marks it on the chip rack. These chips are only good at that table; you must exchange them for cash chips before you leave.
Once the dealer announces that betting is open, you place your wheel chips on the layout. You may bet until the dealer calls no more bets, usually as the ball begins to slow. After the ball settles, the dealer places a marker on the winning number, clears all losing bets from the layout, and then pays the winners. Losing chips are removed first, and winning chips are paid on top of the original bet, which stays in place. Only after the dealer has finished paying and lifted the marker may players touch their chips or place new bets. Reaching for chips while the marker is down is the single most common new-player error, and it will get your hand waved off every time.
Inside bets: fewer numbers, larger payouts
The betting layout is divided into two regions. The inside area is the grid of numbers, from 0 to 36, arranged in rows of three. Bets placed on or between these numbers are inside bets, and they cover a small group of pockets in exchange for a larger payout. The straight-up bet on a single number is the narrowest and pays the most. From there, the bets widen: a split covers two adjacent numbers, a street covers a row of three, a corner covers four, and a six-line covers two adjacent rows. Each wider bet pays less, because it wins more often.
The zero is part of the inside grid, and it can be bet on its own or in combination with neighbouring numbers. The key point is that inside bets are all paid according to the number of pockets they cover, and the payout is always slightly short of what a fair game would pay, which is where the house edge lives.
Outside bets: more numbers, smaller payouts
The outside area surrounds the number grid with boxes for broader categories. Red or black, odd or even, and low or high each cover 18 numbers and pay even money. Dozens and columns each cover 12 numbers and pay more. These bets win more often than inside bets, but the even-money bets in particular are exposed to the zero pockets. On a European wheel, the ball lands in a zero and the red, black, odd, even, low, and high bets all lose. On an American wheel, two pockets do that.
This is why the wheel type matters more for outside bettors than for anyone else. A player making straight-up bets faces a similar edge on either wheel, because the payout for a single number is the same and the zero is just another losing pocket. A player betting red or black faces a materially different edge on the two wheels, because the added double zero is an extra losing pocket that the payout does not compensate for.
| Bet type | Numbers covered | Payout style | What changes the edge |
|---|---|---|---|
| Straight-up | 1 | Largest payout | Wheel type has little effect |
| Split | 2 | Mid-size payout | Wheel type has little effect |
| Street | 3 | Mid-size payout | Wheel type has little effect |
| Corner | 4 | Mid-size payout | Wheel type has little effect |
| Six-line | 6 | Smaller payout | Wheel type has little effect |
| Red/black, odd/even, low/high | 18 | Even money | Zero pockets directly defeat the bet |
| Dozen or column | 12 | Mid-size payout | Zero pockets directly defeat the bet |
The table does not list payout ratios, because those are printed on the layout itself and vary slightly by operator and jurisdiction. Read the felt before you bet. The structure, though, is universal: the more numbers a bet covers, the smaller the payout, and the outside bets are the ones most affected by the zero pockets.
What a strategy chart can and cannot do
Roulette has no decision points the way blackjack does. Once you place a bet, you have no further choices until the ball stops. For that reason, there is no basic strategy chart for roulette in the sense that blackjack has one. What exists instead is a set of bet-selection choices, and the only thing a player controls is which bets they make and how much they stake.
Some players use progression systems, which change the size of the next bet based on the previous result. Doubling after a loss is the most famous. These systems do not change the house edge on any individual bet. They redistribute outcomes: a progression produces many small wins and occasional large losses, while a flat-betting approach produces a more even spread. The expected loss over a large number of spins is the same for the same total amount wagered. No bet selection or staking pattern changes the fact that every wager on the layout carries a built-in house edge.
If you want to lower the expected rate of loss, the only structural choice is the wheel itself. A European wheel costs less to play than an American wheel for the same bets. Beyond that, the game is what it is: a sequence of independent spins, each one settled the moment the ball drops.
Procedural mistakes to avoid at the table
The first mistake is touching chips after the dealer calls no more bets. The marker goes down on the winning number, and the layout is frozen until the dealer finishes clearing and paying. Any hand in the layout during that window is a problem, even if you were only reaching for your own winning chips. Wait for the marker to come off.
The second mistake is trying to leave the table with wheel chips. They are not cash, and the cashier will not take them. You must exchange them at the table for regular casino chips before you walk away. The dealer handles this when you signal that you are finished.
The third mistake is placing a bet that straddles the line between two boxes and expecting it to count as a split. The dealer must be able to read your intention. Place chips cleanly on the line between two numbers for a split, in the corner where four numbers meet for a corner, and fully inside a single box for a straight-up bet. If a chip is ambiguous, the dealer will ask, and the bet may be moved before the spin. Once the ball drops, a misplaced chip is settled where it sits.
FAQ
What is the difference between roulette and other table games?
Roulette has no player decisions after the bet is placed. In blackjack you decide whether to hit or stand; in craps you choose which bets to make and when to take odds. In roulette, the only decision is what to bet before the spin. Everything after that is mechanical.
Can you bet on zero in roulette?
Yes. The zero sits on the inside grid like any other number, and you can bet it straight-up, or in a split with a neighbouring number, or as part of a larger combination. On an American wheel, the double zero is a separate pocket and a separate betting position.
Why do roulette tables use different coloured chips?
Because the layout is shared by everyone at the table, and the dealer needs to know whose chips are where. Each player buys in with a distinct colour, so a stack of chips sitting on a number can be traced to its owner. The chips have no value away from that table.
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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.