Before You Touch the Layout
You walk up to a roulette table, and the first thing you see is a felt covered in numbered boxes. That felt is the square, also called the layout, and it is not decorative. Every chip you place must sit on a specific part of it, and where the chip sits determines exactly which numbers pay if the ball lands on them. The square is the contract between you and the wheel.
Most tables use the same underlying structure, whether the wheel is European with 37 pockets or American with 38. The layout is divided into two zones: an inside area holding the individual numbers, and an outside area holding broader group bets. The wheel itself sits at one end of the table, and the square stretches across the felt in front of the dealer. Chips are placed on the square, never on the wheel.
Reading the Square: Inside and Outside
The inside section is a grid, usually three columns wide and twelve rows deep, holding the numbers 0 through 36. The zero, or zeros on an American layout, sit at the top of the grid, separate from the main block. Each number occupies its own box. The outside section wraps around the grid and holds boxes for larger categories: red, black, odd, even, low numbers, high numbers, dozens and columns.
What matters is not memorising the layout but understanding that a chip placed on a box is a claim on every number printed in that box. A chip on a single number claims one number. A chip on the line between two boxes claims both. A chip on the corner where four boxes meet claims all four. The geometry of the square is the bet.
| Bet type | Where the chip goes | What it covers | How the edge compares |
|---|---|---|---|
| Straight up | Inside a single number box | One number | Highest variance; lowest probability of a hit |
| Split | On the line between two numbers | Two numbers | Higher probability than a straight up, lower payout |
| Street | On the outer edge of a row of three | Three numbers | Broader coverage than a split |
| Corner | On the intersection of four boxes | Four numbers | Covers a block of adjacent numbers |
| Red or black | Outside section | All numbers of that colour | Near-even money, but the zero pocket is not covered |
| Odd or even | Outside section | All odd or all even numbers | Same structure as red/black; zero is not covered |
| Dozen | Outside section, marked 1st 12, 2nd 12, 3rd 12 | Twelve consecutive numbers | Pays less than an inside hit, covers a third of the wheel |
| Column | Outside section, at the foot of a column | Twelve numbers in one vertical column | Same coverage size as a dozen, different number set |
The table above shows the main placements, but the square allows more: a six-line covers two adjacent rows, and some layouts allow a basket bet covering the zero and the first numbers. Each placement carries its own payout and its own probability, and the house edge sits on every one of them. The edge does not disappear when you spread chips across more boxes; spreading changes how often you win and how much you lose per losing spin, not the underlying arithmetic.
How a Round Runs
A round begins when the dealer opens betting. You place chips on the square with your hand, or you hand cash to the dealer and receive colour-specific value chips. On many tables, inside and outside bets have different minimums, and the minimum is per placement, not per spin. The table placard states the minimums; read it before you buy in.
Once bets are down, the dealer spins the wheel and releases the ball in the opposite direction. The ball slows, drops, and settles in a pocket. The dealer marks the winning number on the square with a marker, often called a dolly. Losing bets are cleared first. Winning bets are then paid, and the marker is removed. Only after the marker is off the square may you place chips for the next spin. Touching your chips while the marker is down is the fastest way to be corrected at a table.
What the Zero Does to Every Bet
The zero is the structural fact that shapes the whole square. On a European wheel there is one zero; on an American wheel there are two, the single zero and the double zero. The zero is not red and not black, not odd and not even, not low and not high. It sits outside the outside bets. When the ball lands in a zero pocket, the outside wagers lose, and the inside wagers lose unless a chip was placed directly on that zero or on a combination that includes it.
This is why the American layout carries a larger house edge than the European one: the extra pocket adds a losing outcome that no outside bet covers, without changing the payouts. The square looks similar, but the arithmetic is not. If you have a choice of tables, the wheel type is printed on the layout or shown on the placard, and it is the single most important thing to check before you sit down.
Procedural Mistakes New Players Make
The first mistake is reaching for chips after the dealer has called no more bets. The call means the spin is live, and any chip that lands after the call is not a bet. The second is placing a chip that straddles two boxes without meaning to. If a chip is not clearly inside one box or clearly on a line, the dealer will place it where the geometry dictates, and that placement may not be what you intended. Place deliberately, and watch where the dealer's eyes go when you set the chip down.
The third mistake is assuming a win on the outside pays even money net of the zero. A red bet pays even money, but the zero means the bet is not a true fifty-fifty proposition. The payout is not the probability, and the square does not display the probability anywhere. The wheel does, and the wheel has one or two pockets that the square's outside boxes quietly ignore.
Strategy Charts and the Rule Set
Roulette does not have a basic strategy chart in the way blackjack does, because there is no decision after the bet is placed. The only decisions are which placements to make and how much to stake on each. Any published roulette strategy is a staking or coverage plan, not a way to change the edge. If a chart tells you that a particular combination of placements reduces the house advantage, check what wheel it assumes. A chart built for a single-zero wheel does not transfer to a double-zero layout, and a chart that ignores the zero entirely is describing a game that is not on the felt.
The square is a map of the wheel, but it is not the wheel. The wheel has the pockets; the square has the claims. Learning to use the square means learning which claim each placement makes, and then accepting that the claim is always slightly smaller than the wheel would suggest.
FAQ
Can I place a bet after the ball starts spinning?
No. Once the dealer calls no more bets, the square is closed. Some tables allow a brief window while the ball is moving, but the call is the boundary, and it is not negotiable. Wait for the marker to come off before reaching for the next spin.
What is the difference between a straight up and a split on the square?
A straight up is a chip fully inside one number box and covers only that number. A split is a chip straddling the line between two adjacent boxes and covers both. The split pays less than the straight up because it covers twice as many numbers, but neither bet changes the house edge on the wheel.
Why does the dealer sometimes move my chip after I place it?
The dealer moves a chip when its position is ambiguous. A chip that is not clearly on a line or clearly in a box may be interpreted as a different bet than you intended. The dealer is not changing your bet; the dealer is resolving where the chip sits under the table's placement rules.
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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.