The color count changes with the wheel, not the game
You sit down at a roulette table, glance at the wheel, and see red and black pockets alternating around the outside. The question of how many red slots there are sounds simple, and it is, but the answer depends on which wheel is in front of you. A European wheel carries 18 red pockets. An American wheel also carries 18 red pockets. The total number of pockets is what differs: 37 on the European layout and 38 on the American layout, because the American wheel adds a second green zero. So the red count is identical, but the proportion of the wheel that is red is not.
That distinction matters more than most new players expect. The extra green pocket on an American wheel does not change how many red numbers exist; it changes how often a bet on red wins relative to how often the ball lands somewhere else. Understanding that relationship is the first step toward reading any roulette table correctly.
What the wheel looks like
Roulette numbers run from 0 to 36. On a European wheel there is a single zero, colored green. On an American wheel there is a zero and a double zero, both green. Every other number is either red or black, and the colors are assigned to specific numbers rather than alternating in strict sequence around the wheel. The number 1 is red, 2 is black, 3 is red, and so on, but the physical arrangement around the wheel is designed to mix high and low, odd and even, and red and black as evenly as the wheel geometry allows.
That gives 18 red numbers and 18 black numbers on both wheel types. The green pockets belong to neither color, which is the entire reason the house holds an edge on red-or-black bets. If the ball lands in a green pocket, every even-money wager on red or black loses, or is subject to the table's specific rule for zero outcomes.
| Wheel type | Total pockets | Red pockets | Black pockets | Green pockets |
|---|---|---|---|---|
| European | 37 | 18 | 18 | 1 |
| American | 38 | 18 | 18 | 2 |
Why the wheel type changes the bet, not the count
A bet on red pays even money on both wheel types. The payout is not where the difference hides. The difference is in how many losing pockets exist for that bet. On a European wheel, a red bet covers 18 of 37 pockets, leaving 19 pockets that lose: the 18 black numbers plus the single green zero. On an American wheel, the same red bet covers 18 of 38 pockets, leaving 20 losing pockets: 18 black numbers plus two green zeros.
That is why the house edge on the American layout is higher for the same named bet. The red count did not change; the number of ways to lose did. When you compare two roulette tables, the first thing to check is not the color pattern but whether the wheel has one zero or two. The table layout prints this clearly, and the wheel itself shows the green pockets at a glance.
Reading the table layout before you buy in
Roulette is a game of one decision repeated: you place chips on the layout, the dealer spins the wheel, and the ball settles in a numbered pocket. The sequence from buy-in to settlement follows a fixed rhythm. You buy chips at the table, the dealer or the cashier converts your money into roulette chips, and you place them on the felt before the dealer calls for no more bets. The ball is spun in the opposite direction to the wheel, and when it drops, the dealer marks the winning number and clears losing bets before paying winners.
The layout itself is a map of every bet you can make. Inside bets sit on the numbered grid and cover specific numbers or small groups of them. Outside bets sit around the grid and cover broad categories: red or black, odd or even, high or low, columns, and dozens. Each bet type carries its own payout and its own house edge, and the edges differ materially between bet types on the same table.
| Bet type | What it covers | Payout structure | How the edge behaves |
|---|---|---|---|
| Straight up | One single number | Highest payout, lowest hit frequency | Highest variance; edge fixed by wheel type |
| Split or street | Two or three adjacent numbers | Lower payout than straight up | Edge identical to other inside bets on same wheel |
| Red or black | 18 color pockets | Even money | Loses on green; edge differs by wheel type |
| Column or dozen | 12 numbers | 2 to 1 | Same structural edge as other outside bets |
The key point is that the house edge on roulette is set by the wheel type, not by which bet you choose. A straight-up bet and a red bet on the same European wheel carry the same house edge, even though their payouts and hit frequencies are completely different. The American wheel's extra green pocket raises the edge across every bet on that layout. What changes between bets is variance: how often you win, how much you win when you do, and how long a bankroll can survive the gaps between wins.
Where new players go wrong at the wheel
The first procedural mistake is buying in with casino chips instead of roulette chips. Roulette chips are color-coded per player so the dealer can tell whose bet is whose on a crowded layout. If you place ordinary casino chips on the felt, the dealer will usually ask you to exchange them, and in the confusion of a busy table it is easy to lose track of which stack is yours. Buy in at the table, not at the main cashier, and keep your roulette chips in front of you until you are ready to color up and leave.
The second mistake is reaching for a bet after the dealer has called no more bets. The call is not a suggestion. Once the ball is in motion and the dealer closes the layout, any chip that lands late is returned, and repeated late betting can get you removed from the table. Place every bet while the layout is open, and if you want to change a bet, do it before the spin begins.
The third mistake is assuming that a run of reds makes black more likely. Each spin is an independent event. The wheel has no memory, and the red pockets do not become more or less likely because the last five spins landed red. The probability of red on the next spin is the same as it was on the previous spin: 18 red pockets against the total number of pockets on that wheel. No betting progression changes that.
Strategy charts come from the exact wheel in front of you
Roulette does not have a strategy chart in the way blackjack does, because roulette has no decisions after the bet is placed. The only choices are which bets to make, how much to stake, and when to stop. What roulette does have is a fixed payout schedule tied to the wheel type, and that schedule is printed on the table layout or available in the game information panel if you are playing an electronic version. Before you sit down, confirm whether the wheel is European or American, because that single fact determines the house edge on every bet you can place.
If you are playing an online or electronic roulette game, the game information panel will state the wheel type and the theoretical return to player percentage. Return to Player, or RTP, is a long-run statistical average over a very large number of spins, not a per-session guarantee. The house edge is the mathematical complement of that figure for the same game under the same rule set. A higher RTP on a European wheel reflects the missing double zero, not a different red count.
FAQ
Are there always 18 red numbers on every roulette wheel?
Yes. Both the European and American layouts use 18 red numbers and 18 black numbers. The difference between the wheels is the number of green pockets: one on the European wheel and two on the American wheel.
Does betting on red give you a 50 percent chance of winning?
No. A red bet covers 18 pockets, but the wheel has 37 or 38 pockets in total because of the green zero or zeros. The green pockets lose on a red bet, so the chance of winning is slightly below half, and the exact figure depends on which wheel type is in use.
Why does the American wheel have worse odds if the red count is the same?
Because the American wheel adds a second green pocket without adding any red or black pockets. A red bet still covers 18 pockets, but there is one more pocket that loses, which increases the house edge on every bet on that layout.
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