Name the exact version
Roulette has different wheel and payout variants. The supplier’s catalogue illustrates that product families contain multiple named formats. Check the actual rule sheet rather than applying a generic percentage to a multiplier or modified-payout game.
Evolution — roulette variants ↗The calculations below use two explicit models: a uniformly random 37-pocket wheel containing 1–36 and one zero, or a 38-pocket wheel with an added double zero. They assume an ordinary straight-number payout of 35 units of profit on a winning 1-unit stake.
Probability and return
| Assumed wheel | One chosen pocket | Total winning return | Expected return per unit |
|---|---|---|---|
| 37 pockets | 1/37 ≈ 2.7027% | 36 units including stake | 36/37 ≈ 0.972973 |
| 38 pockets | 1/38 ≈ 2.6316% | 36 units including stake | 36/38 ≈ 0.947368 |
The 35-to-1 profit payout is not the same as a 35-unit total return. Including the original stake produces 36 units in this model. Confusing these definitions changes the expected-value calculation.
Derive the edge
38-pocket model: 1 − 36/38 = 2/38 ≈ 5.2632%
These edges follow directly from the stated assumptions. They do not apply automatically to every side wager, special zero rule, wheel design or promotional payout. A game-specific comparison needs the actual conditions.
Expected loss concerns cumulative exposure under a mathematical model; it is not the exact loss an individual will experience.
Why a streak is not a forecast
For independent equally distributed spins, the probability of a specified pocket on the next spin remains 1/37 in the first model, regardless of the last few results. Independence is an assumption to verify, not a badge that this article awards to an unknown site.
The British random-outcome technical standard provides a regulatory reference for unpredictability. It is not proof of compliance by an unrelated operator.
UK Gambling Commission — random outcome technical standard ↗What to record in a claim check
Record the pocket count, paytable, zero treatment, wager type and evidence of the stated configuration. A cropped screen may omit the rule responsible for a different percentage. A table name such as “European” or “American” should be checked against the actual rules.
This article explains arithmetic and does not recommend a table, wagering system or means of making money.
For the wider context, read our India online casino guide.
Common questions
Does a number become due after not appearing?
Not in an independent random model. Its next-event probability is unchanged.
Do these percentages cover all roulette products?
No. They cover only the pocket counts and ordinary payout assumptions stated here.
Sources & notes
Sources checked 14 October 2026. Prepared with AI assistance and checked against the linked sources.
