Before a roulette wager, count the wheel's numbered pockets and read the displayed rules. A standard single-zero wheel has numbers 1–36 plus one 0, for 37 pockets. A standard double-zero wheel has 1–36, 0 and 00, for 38 pockets. That one extra losing pocket changes the probability and house edge on the usual even-money and straight-up wagers.
Do not rely only on a lobby label or table colour. Open the actual wheel or rules screen, identify every zero pocket, confirm the payout table, and check whether a special rule such as la partage or en prison is explicitly stated. These are generic rule examples, not claims that a particular Lotwin wheel or feature is currently available.
Count the pockets first
Use the visible wheel and table layout together. The standard checks are:
| Wheel description | Numbered pockets | Zero pockets | Total pockets |
|---|---|---|---|
| Single-zero | 1–36 | 0 | 37 |
| Double-zero | 1–36 | 0 and 00 | 38 |
If the layout shows another zero symbol or a different total, stop and read that table's rules rather than forcing it into either standard example. The roulette learning hub organises the core wheel, layout and betting-system concepts; the roulette table layout guide explains inside and outside betting areas, while the European and American roulette comparison gives broader rules context.
Compare an even-money wager under each standard wheel
Red/black, odd/even and high/low normally cover 18 numbered pockets. The zero pockets are outside those 18 outcomes.
For a standard single-zero wheel:
win probability = 18 ÷ 37 = 48.65%
loss probability = 19 ÷ 37 = 51.35%
At a 1:1 payout, the resulting house edge is approximately 2.70%.
For a standard double-zero wheel:
win probability = 18 ÷ 38 = 47.37%
loss probability = 20 ÷ 38 = 52.63%
At a 1:1 payout, the resulting house edge is approximately 5.26%.
| Standard wheel | Win probability on an 18-number even-money wager | Approximate house edge at 1:1 |
|---|---|---|
| Single-zero, 37 pockets | 48.65% | 2.70% |
| Double-zero, 38 pockets | 47.37% | 5.26% |
These are long-run mathematical expectations. They do not predict the next spin or make any number, colour or pattern due.
Check a straight-up number without confusing probability and payout
A straight-up wager covers one number and commonly pays 35:1 in the standard examples. The chance of that one number is 1/37 on a single-zero wheel and 1/38 on a double-zero wheel.
| Standard wheel | Chance of one selected number | Approximate house edge at 35:1 |
|---|---|---|
| Single-zero, 37 pockets | 2.70% | 2.70% |
| Double-zero, 38 pockets | 2.63% | 5.26% |
The larger headline payout does not remove the zero-pocket advantage. Verify the displayed 35:1 payout rather than assuming every variant uses it. The casino maths hub explains why house edge is a long-run average rather than a session forecast.
Treat la partage and en prison as rule-specific exceptions
Some single-zero roulette rules can reduce the loss on qualifying even-money wagers when the ball lands on zero:
- La partage generally returns half of a qualifying even-money stake and settles the other half as a loss.
- En prison generally holds a qualifying even-money wager for a later spin under the table's stated release rules.
Do not assume either rule applies because a wheel has one zero, uses a European-style layout or carries a familiar label. Confirm all of the following on the opened table:
- whether the special rule is named;
- which wagers qualify;
- what happens after zero;
- whether any repeat-zero or release condition applies;
- whether the rule changes the stake return or only the settlement timing.
If the rule is absent or unclear, calculate from the ordinary displayed wheel and payout instead.
Save the displayed rules before wagering
A short pre-play record can prevent a later ruleset mismatch. Save only what is necessary:
- the table or game title and provider shown on screen;
- the visible wheel layout, including every zero pocket;
- the main payout table;
- any special zero-rule text;
- the date and time of the observation.
Do not publish account details, balances, IDs or payment information. If a result is disputed, the round-ID evidence guide explains how to preserve a minimal record without sharing secrets.
A practical roulette boundary
Changing wheel versions changes the long-run cost; it does not create a reliable short-run winning method. Set a spending and time limit before play, never chase a sequence, and stop if gambling is causing stress or financial harm. The Responsible Play page lists non-commercial support routes and safer-play boundaries.
The useful decision is not which result will appear next. It is whether you understand the exact wheel, payout and zero rule before risking money.