Roulette outcomes come from a numbered wheel or a software implementation. The number of zero pockets is a central rule distinction: more pockets without a corresponding payout increase changes the expected house advantage.
Single-zero versus double-zero roulette
A conventional European single-zero wheel has 37 pockets (0–36), while an American double-zero wheel has 38 (0, 00 and 1–36). A straight-up winning bet conventionally pays 35:1 in both. Under these assumptions the expected house edge is approximately 2.70% and 5.26%, respectively; special variants can differ.
| Standard wheel | Pockets | Straight-up payout | House edge, assuming 35:1 |
|---|---|---|---|
| European single-zero | 37 | 35:1 | 1/37 ≈ 2.70% |
| American double-zero | 38 | 35:1 | 2/38 ≈ 5.26% |
The percentages are mathematical deductions based on wheel structure, not audited current Razed table figures.
How inside and outside roulette bets differ
Inside bets target individual numbers or smaller groups; outside bets cover larger sets such as red/black or odd/even. Outside bets usually hit more frequently but pay less. Frequency of wins alone does not determine expected value, and no combination of bets guarantees a profit.
Why a “winning roulette system” cannot remove the house edge
Changing bet sizes after wins or losses does not change the probability of an independent wheel result. Martingale-style progression increases the required stake quickly and is constrained by table maximums and finite budgets. A previous run of red or black does not cause the next independent spin to favor the opposite color. Regulator explanation of house edge ↗
Live wheel versus software roulette
Live roulette uses a physical wheel and operational integrity controls, while software roulette relies on game design and RNG assurance. The UK Gambling Commission explains why live wheel monitoring and RNG-based game monitoring involve different checks. Live and RNG integrity considerations ↗
| Question | Live roulette | RNG roulette |
|---|---|---|
| What selects outcome? | Physical wheel and ball | Software system |
| What can be audited? | Equipment and physical process | RNG/design and transaction records |
| What should player check? | Wheel variant, table rules, integrity information | Game rules, variant and testing disclosures |
Roulette alternatives and variant checks
Check for single-zero, double-zero, French special rules such as la partage, and any modified payout schedules at the exact table. Avoid claiming a variant always has a particular return without its complete rules. Live dealer comparison and all casino games provide broader context.
Explore related casino game guides
Each of these guides covers a different game mechanic or player decision.
- Online Casino Games — guide to game categories
- Online Slots — slot game mechanics
- Live Casino — live dealer evaluation
- Online Blackjack — blackjack decision framework
Evidence and editorial limitations
This independent affiliate guide does not operate Razed. Regulatory sources provide general reference principles, not a claim that the referenced regulator licenses Razed. Operator-specific game catalogues, availability, odds and payout schedules must be checked in the active game. Gambling involves a risk of loss; eligibility and local laws apply. For help with limiting or stopping gambling, read responsible gambling and self-exclusion resources.