The payout is fixed, but the odds are not
A single-number bet in roulette, called a straight-up bet, pays a fixed multiple of your stake. The number that matters most is not the payout itself but the gap between that payout and the true odds of the ball landing in your pocket. That gap is where the house edge lives, and it changes depending on which wheel you are sitting at.
When you place a chip directly on one number, the table pays you a set ratio if that number comes up. The payout is the same on almost every roulette table in the world, but the chance of winning is not. A European wheel has 37 pockets and a single zero. An American wheel has 38 pockets and a double zero. The payout on a winning straight-up bet is the same on both, which means the American layout keeps a larger share of every wager over time.
This is not a small detail. The extra pocket on the American wheel changes the expected rate of loss on the same bet. If you are choosing between tables, the wheel type is the single most important thing to check before you buy in.
What the bet is
A straight-up bet is the simplest wager on the layout. You put one or more chips on a single number, including the zero or double zero if the wheel has one. The bet wins only if the ball lands in exactly that pocket. Nothing else pays, and there is no partial win.
The payout for a winning straight-up bet is fixed and printed on the table layout. It is expressed as a ratio, not as a percentage. The ratio tells you how many units you receive for each unit you stake, and it includes your original stake in the return. If you are unsure how to read the ratio, the dealer or the table signage will state it plainly.
Roulette numbers run from 0 to 36. On an American wheel, the double zero is an additional pocket. The presence of that extra pocket does not change the payout, but it does change the probability of any single number coming up.
How a round plays out
The sequence of a roulette round is short, which is part of why the game moves quickly. Understanding each step helps you avoid the procedural mistakes that cost new players chips.
First, you buy in. You place cash on the table, never directly into the dealer's hand, and the dealer exchanges it for roulette chips. These chips are usually a different colour for each player so the dealer can tell whose bets are whose. They have no value away from the table and must be exchanged back for cash before you leave.
Second, you place your bet. You put your chip directly on the number you want. If you are betting multiple numbers, you place chips on each one. The dealer will announce when betting is closing, and after that point you cannot touch your chips.
Third, the dealer spins the wheel and releases the ball in the opposite direction. The ball loses momentum and falls into a pocket. The dealer places a marker on the winning number and then settles all bets. Losing bets are cleared first, then winning bets are paid. Your original chip stays on the table and the payout is added next to it. You collect your chips only after the dealer has finished paying the entire layout.
Inside bets compared
A straight-up bet is one of several inside bets, which are the wagers placed on the numbered grid rather than on the outside sections. Each inside bet covers a different set of numbers and pays a different ratio. The payout is always lower than the true odds would suggest, and that difference is the house edge.
| Bet type | What it covers | How the payout compares to the odds |
|---|---|---|
| Straight-up | One single number | Highest payout, lowest chance of winning |
| Split | Two adjacent numbers | Lower payout than straight-up, higher chance |
| Street | Three numbers in a row | Lower payout again, covers more pockets |
| Corner | Four numbers meeting at a corner | Lower payout, broader coverage |
| Six line | Six numbers across two rows | Lowest inside payout, widest inside coverage |
None of these bets is better in the sense of removing the house edge. They differ in how often they win and how much they pay when they do. A straight-up bet wins rarely and pays the most. A six-line bet wins more often and pays less. The expected rate of loss on all of them is governed by the same wheel structure.
European and American wheels
The difference between the two main wheel types is one pocket, and that pocket changes the arithmetic on every bet. A European wheel has 37 pockets and a single zero. An American wheel has 38 pockets and a single and double zero.
On a European wheel, a straight-up bet wins if the ball lands in your number, and loses on every other pocket. On an American wheel, the same bet loses on one additional pocket. The payout does not increase to compensate. That is why the American layout carries a larger house edge on the same wager.
Some tables offer a rule variation that changes how losing even-money bets are treated when the ball lands on zero. This rule does not apply to straight-up bets, so it is irrelevant to the question of what a single number pays. It matters only for outside bets like red or black, odd or even, and high or low.
Before you sit down, look at the wheel itself. If it has a double zero, you are on an American layout. If it has only a single zero, you are on a European layout. The payout on a straight-up bet is the same on both, but your expected rate of loss is not.
What the house edge means for a single number
House edge is the mathematical advantage the operator holds on a given game, expressed as a percentage of each wager. House edge and RTP are complements: they sum to 100% for the same game. For a straight-up bet, the house edge is created by the difference between the payout ratio and the true odds of the bet winning.
The true odds of a single number on a European wheel are based on 37 pockets. The payout ratio is lower than those true odds. On an American wheel, the true odds are based on 38 pockets, and the payout ratio is the same. The gap is wider on the American wheel, which is why the house edge is larger there.
This does not mean you will lose a fixed amount on any given spin. The house edge is a long-run statistical average, not a per-session guarantee. In the short run, a single spin can win or lose. Over a very large number of spins, the structure of the wheel and the payout ratio determine the average result.
Procedural mistakes new players make
The first mistake is touching chips after the dealer has called no more bets. Once betting closes, any chip on the layout is a live wager. If you move it, you are changing a bet after the outcome is already in motion, and the table will treat that as a serious violation. Leave your chips alone until the dealer has finished paying the layout.
The second mistake is placing a chip on a line between numbers without understanding what you have bet. A chip placed on the line between two numbers is a split bet, not a straight-up bet. A chip placed on the corner where four numbers meet is a corner bet. If you want a single number, place the chip fully inside the square for that number. If you are not sure, ask the dealer before the spin, not after.
The third mistake is leaving the table with roulette chips still in your hand. Roulette chips are colour-coded and have no value at the cashier. You must exchange them for standard casino chips at the roulette table before you walk away. If you forget, you will be sent back to the table to convert them.
Where to find the exact payout
The payout ratio for a straight-up bet is printed on the table layout, usually near the number grid or on the felt itself. The same information appears in the game rules panel if you are playing an electronic roulette terminal or an online version. The game information panel in an online roulette game states the payout for each bet type and the wheel configuration in use.
If you are playing at a live table, the dealer will state the payout if you ask before placing your bet. Do not ask after the ball has landed; the time to clarify a bet is before the spin.
The wheel type is the other piece of information you need. Look at the wheel, not just the layout. A double zero on the wheel means the American configuration, which changes the house edge on every bet including a straight-up. The layout may show the double zero as a betting option, but the wheel itself is the definitive check.
FAQ
Does a straight-up bet pay the same on every roulette table?
The payout ratio is fixed and printed on the table layout, and it is the same on almost every standard roulette table. The wheel type does not change the payout, but it changes the odds of winning, because an American wheel has one more pocket than a European wheel.
Can I bet on more than one number at once?
Yes. You can place chips on as many individual numbers as you like, and each chip is settled independently. A chip placed on the line between two numbers is a split bet, not two straight-up bets, so make sure the chip is fully inside the square if you want a single number.
Why does the payout not match the true odds?
The payout is deliberately lower than the true odds of the bet winning. That difference is the house edge, and it is what allows the operator to run the game. The gap is wider on an American wheel because the extra double-zero pocket increases the true odds against you without increasing the payout.
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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.