Roulette is one of the most recognizable casino table games. A small white ball travels around a spinning wheel before settling into a numbered pocket. That number determines the outcome.
The basic rules are straightforward, but the betting layout introduces several terms that can seem confusing at first: dozens, columns, straight-up bets, splits and more. Roulette also has a long history of betting systems, including the Martingale, Paroli and Cocomo methods.
This guide focuses on European Roulette, explaining how the wheel works, how betting categories are organized, and how payouts and probabilities relate to one another. It also explores the mathematics behind roulette strategies and the multiplier system featured in Lightning Roulette.
Types of Online Roulette
The two best-known versions are European Roulette and American Roulette. French Roulette is another traditional variation, distinguished by its table conventions and rules governing the zero.
| Roulette Type | Pockets | Main Feature |
|---|---|---|
| European Roulette | 37 | Single-zero wheel |
| American Roulette | 38 | Double-zero wheel |
| French Roulette | 37 | French table conventions and special zero rules |
This guide uses European Roulette as its main reference because of its straightforward single-zero structure.
European Roulette
Standard RTP: 97.30%
European Roulette has 37 pockets: numbers 1 through 36 and a single green zero. Eighteen numbers are red, eighteen are black, and zero is green.
Each pocket has a theoretical probability of 1 in 37, approximately 2.70%, on an unbiased wheel.
American Roulette
Standard RTP: 94.74%
American Roulette uses 38 pockets. It adds a second green pocket, marked 00, to the European wheel's existing zero.
The standard straight-up payout remains 36x, including the original stake. However, the additional zero reduces the theoretical RTP to 94.74%.
French Roulette
RTP: 97.30%–98.65%
French Roulette uses the same 37-pocket single-zero wheel as European Roulette. Traditional French layouts may feature French-language betting labels and announced bets covering particular sections of the wheel.
French Roulette is also associated with two special zero rules: La Partage and En Prison. Their availability depends on the particular game.
La Partage
RTP: 98.65%
Under La Partage, when zero appears, half the original stake is returned on qualifying even-money bets such as Red/Black or Odd/Even. For these bets, the theoretical RTP increases to 98.65%.
En Prison
RTP: 98.65%
Under En Prison, an eligible even-money bet remains on the table when zero appears. Its settlement is carried over to another spin, where the original stake may be returned or forfeited depending on the outcome and the table's rules.
How the Roulette Wheel and Betting Layout Work
Numbers appear in different arrangements on the roulette wheel and the betting table.
On the European wheel, the numbers are not arranged sequentially. Starting from zero and moving in one direction, the sequence begins 32, 15, 19, 4, 21, 2 and so on.
The betting layout is different. Numbers 1 through 36 are organized into twelve rows and three columns.
This distinction explains the terminology behind dozens, columns, streets and other betting categories. The wheel determines the outcome, while the layout organizes the possible numerical selections.
Inside Bets vs. Outside Bets
Roulette bets fall into two broad categories: inside bets and outside bets.
Inside bets cover individual numbers or small groups of adjacent numbers. Outside bets cover broader categories, including colors, number ranges and predefined groups.
What Are Inside Bets?
The main inside-bet categories are Straight Up, Split, Street, Corner and Six Line.
Each category covers a different number of pockets, resulting in a different probability and payout.
| Bet Type | Numbers Covered | Total Payout |
|---|---|---|
| Straight Up | 1 | 36x |
| Split | 2 | 18x |
| Street | 3 | 12x |
| Corner | 4 | 9x |
| Six Line | 6 | 6x |
A Straight Up bet refers to a single number. A Split covers two adjacent numbers, while a Street covers three numbers in one horizontal row.
A Corner covers four numbers arranged in a square, and a Six Line covers two adjacent streets, totaling six numbers.
Categories covering fewer numbers have lower probabilities but higher payouts. Categories covering more numbers have higher probabilities and lower payouts.
All multipliers in the table represent total payouts, including the original stake. For example, a 36x payout consists of 35x in net winnings plus the original 1x stake.
What Are Outside Bets?
Outside bets cover larger groups of numbers. The main categories are Red/Black, Odd/Even, High/Low, Dozens and Columns.
| Bet Type | Numbers Covered | Total Payout |
|---|---|---|
| Red/Black | 18 | 2x |
| Odd/Even | 18 | 2x |
| High/Low | 18 | 2x |
| Dozen | 12 | 3x |
| Column | 12 | 3x |
Red/Black classifies numbers by color. Odd/Even separates odd and even numbers, while High/Low divides numbers into two ranges: 1–18 and 19–36.
Each of these categories covers 18 numbers, giving it a theoretical probability of 18/37, or approximately 48.65%, on a European wheel.
Dozens and Columns each cover twelve numbers and have a standard total payout of 3x.
Understanding Roulette Betting Categories
2x Payouts: Red/Black, High/Low and Odd/Even
Red/Black Bet
Standard total payout: 2x
This category covers either the 18 red numbers or the 18 black numbers on the wheel.
High/Low Bet
Standard total payout: 2x
Low covers numbers 1–18, while High covers numbers 19–36. Each group contains 18 numbers.
Odd/Even Bet
Standard total payout: 2x
This category covers either the 18 odd numbers or the 18 even numbers. Each group has a theoretical probability of approximately 48.65%. Zero belongs to neither group.
3x Payouts: Dozens and Columns
Dozens and Columns are two outside-bet categories that each cover twelve numbers. Both have the same probability and payout structure, although the numbers are grouped differently.
Dozen Bets
Standard total payout: 3x
The word "dozen" means a group of twelve. In roulette, numbers 1–36 are divided into three groups of twelve consecutive numbers.
Each dozen covers twelve of the wheel's 37 pockets, resulting in a theoretical probability of 12/37, or approximately 32.43%.
Together, the three dozens cover every number from 1 to 36. The green zero is excluded.
| Dozen | Numbers Covered |
|---|---|
| 1st 12 | 1–12 |
| 2nd 12 | 13–24 |
| 3rd 12 | 25–36 |
Column Bets
Standard total payout: 3x
A column is one of the three vertical groups on the roulette betting layout.
For example, the first column contains 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31 and 34.
While dozens divide numbers into consecutive groups, columns follow their vertical positions on the betting table. Each column still contains exactly twelve numbers.
3x Payouts and Probability
Dozens and Columns have a standard total payout of 3x. Their theoretical probability, however, is approximately 32.43%, not exactly one-third.
This payout structure is also relevant when examining the mathematics behind betting systems traditionally associated with threefold returns.
What Does Basic Strategy Mean in Roulette?
In roulette, the word "strategy" is commonly associated with systems that organize betting patterns, stake variations or number selections according to predefined rules.
Unlike blackjack, however, roulette does not have a universally accepted basic strategy that identifies mathematically optimal decisions based on changing game conditions.
On an unbiased wheel, each spin is independent. Previous results do not alter the probability of any number appearing on the next spin.
Traditional systems such as Martingale and Paroli describe different patterns of stake progression. The Cocomo method is another system discussed in connection with threefold payouts, including the mathematical structure of Dozen and Column bets.
Learn More About Betting Strategies
The Cocomo Method and 3x Payouts
The Cocomo method belongs to a category of betting systems associated with threefold payouts.
Its underlying mathematical assumptions differ from those of systems developed around even-money bets. This distinction matters when comparing the structure of betting systems across casino table games.
In European Roulette, Dozen and Column bets provide examples of categories with 3x total payouts. The probability of a winning result is approximately 32.43%, reflecting the presence of the single zero.
What Is Lightning Roulette? Understanding the Multiplier System
Reference Image: Evolution Gaming Lightning Roulette
Lightning Roulette, developed by Evolution Gaming, is a live roulette variation that combines the traditional European wheel with randomly generated payout multipliers.
The wheel has the same 37 pockets as standard European Roulette. What sets the game apart is its system of Lucky Numbers and Lucky Payouts.
Each round features a random selection of numbers that receive special multipliers. These multipliers change the payout associated with a qualifying straight-up result without changing the number of pockets on the wheel.
How Lightning Multipliers Work
Lightning Roulette randomly selects between one and five Lucky Numbers during each round.
These numbers receive multipliers of 50x, 100x, 200x, 300x, 400x or 500x.
One important difference from standard roulette is the ordinary straight-up payout.
A standard European Roulette straight-up result pays 36x in total, including the original stake. In Lightning Roulette, a straight-up result without a special multiplier pays 30x in total.
That corresponds to net winnings of 35x and 29x, respectively, before accounting for the original stake.
When a winning straight-up number is also one of the selected Lucky Numbers, the corresponding special multiplier determines its payout.
The multiplier feature applies specifically to Straight Up bets. Other categories, including Splits, Corners, Red/Black, Dozens and Columns, retain their standard roulette payouts.
Lightning Roulette vs. Standard European Roulette
| Feature | European Roulette | Lightning Roulette |
|---|---|---|
| Wheel | 37 pockets | 37 pockets |
| Regular Straight Up | 36x total payout | 30x total payout |
| Lucky Multipliers | None | 50x–500x |
| Lucky Numbers | None | 1–5 per round |
| Dozens and Columns | Standard payouts | Standard payouts |
Lightning Roulette retains the familiar European wheel and betting categories while introducing randomly generated multipliers that alter the payout distribution.
Other variations, including XXXtreme Lightning Roulette, use more elaborate multiplier systems and different payout structures. They are distinct games rather than interchangeable versions of the same rules.
Conclusion: Understanding Roulette Rules, Payouts and Probability
European Roulette is built around a 37-pocket wheel and a collection of betting categories, each defined by the numbers it covers.
Inside and outside bets differ in their numerical coverage, probabilities and payout multipliers.
Dozens and Columns are particularly useful examples for understanding the mathematics of 3x total payouts and their relationship to traditional betting-system concepts.
Meanwhile, systems such as Martingale, Paroli and Cocomo describe different patterns of stake progression, but they do not change the probability of the wheel.
Lightning Roulette adds another layer through randomly generated Lucky Numbers and payout multipliers, creating a different distribution of possible returns.
Once the wheel layout, probability and payout structure are understood, the terminology becomes much easier to follow.
Rules plus bets equals roulette... or "rou-bet"? That's definitely not how the word works. Oh well... lol.
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