Number Wheel (American)
Thirty-eight pockets, not thirty-seven. SpinyWheel's American number wheel holds every pocket on an American roulette wheel including both zeroes, each at 2.6 percent, arranged in true wheel-head order rather than numerical sequence.
The second zero is the whole story
American and European roulette look nearly identical and are not. One extra pocket changes the value of every bet on the board:
| European wheel | American wheel | |
|---|---|---|
| Pockets | 37 | 38 |
| Chance per number | 2.70% | 2.63% |
| Single number pays | 35 to 1 | 35 to 1 |
| House edge | 2.70% | 5.26% |
Both wheels pay a single-number win at 35 to 1. Neither pays 37 to 1, which is what a fair payout on the American wheel would be. That gap between true odds and paid odds is the house edge, and adding a pocket without changing the payout doubles it.
Five point two six percent is the figure to remember. It applies to essentially every bet on an American wheel and does not change based on which numbers you pick, how long you play, or what came before.
Red, black, and the two green pockets
Eighteen pockets are red and eighteen are black. The remaining two are green, and they are the entire mechanism:
| Outcome | Pockets | Chance | Pays |
|---|---|---|---|
| Red | 18 | 47.4% | Even money |
| Black | 18 | 47.4% | Even money |
| Green | 2 | 5.3% | — |
An even-money bet is not an even-money bet. Red comes up 47.4 percent of the time and pays as though it came up half the time, and the 5.3 percent sitting in green is where the difference goes.
The same construction applies to odd and even, and to high and low. Every one of them looks like a coin flip on the board and none of them is.
Every bet carries the same edge
This is the counterintuitive part. Red or black, a single number, a corner, a column, a dozen: payouts are set so the edge lands at 5.26 percent across almost all of them.
No bet selection, pattern, or system changes this. Progressions like doubling after a loss alter how losses are distributed over time; they do not touch the edge, and they meet table limits and finite bankrolls long before they meet anything else.
Past results carry no information either. Each spin is independent, so a colour that has come up ten times running is exactly as likely on the eleventh.
The sequence is the real tell
Look at the order: 0, 28, 9, 26, 30 and onward, with the two zeroes directly opposite one another and colours alternating almost throughout.
The layout is engineered so adjacent pockets sit far apart on the betting board. Numbers physically next to each other belong to different columns, dozens, and colours, which means no bet covers a contiguous arc of the wheel. That is a fairness measure and an anti-prediction measure at once.
It is also how you identify which wheel you are looking at. The American and European wheels use genuinely different sequences, so the order tells you more reliably than counting pockets does. Use Shuffle wheel if you want scattered slices, but not Sort wheel, since numerical order would misrepresent the wheel entirely.
What this wheel is actually for
Learning the layout, teaching probability, and picking a number between 0 and 36 when you want a wheel that looks the part.
The house edge makes it a genuinely useful teaching object. Nothing demonstrates the difference between true odds and paid odds more clearly than a device paying 35 to 1 on a 37 to 1 event, and the American wheel makes the point twice over.
If you are actually gambling, the only decision on this page that changes anything is choosing a single-zero wheel over a double-zero one, which halves the edge. The 1–100 Lucky Number Wheel covers why chosen numbers feel different, and the 1–58 Toto 6/58 Number Wheel gives lotteries the same honest treatment.
FAQ
Thirty-eight: 1 through 36 plus a single zero and a double zero. The European wheel has 37, omitting the double zero. That one pocket is the difference between a 2.70 percent house edge and a 5.26 percent one, since both wheels pay a single-number win at the same 35 to 1.
5.26 percent, roughly double the European wheel's. It applies to nearly every available bet, so switching between red, a single number, or a corner changes the variance but not the edge. No betting system alters it, because the edge is built into the payout rather than the bet selection.
No. Eighteen pockets are red and eighteen black, but there are thirty-eight in total, so red comes up 47.4 percent of the time and pays as though it were 50. The two green zeroes account for the difference and are precisely where the edge on even-money bets comes from.
Because the layout is designed so physically adjacent pockets sit far apart on the betting board, across different colours, columns, and dozens. That stops any single bet covering a continuous arc of the wheel. The sequence also differs between the American and European wheels, so the order identifies which one you are looking at.