The Basics

How Roulette Works

A roulette wheel is a spinning disk divided into numbered pockets. A dealer (or random number generator online) spins the wheel in one direction and launches a small ball in the opposite direction. When the wheel slows, the ball drops into one of the numbered pockets — that number is the winning result.

Before the spin, players place bets on the table predicting where the ball will land. You can bet on a single number, a group of numbers, a colour (red or black), whether the result is odd or even, and many other combinations. Payouts depend on the probability of winning — rarer outcomes pay more.

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The one rule that matters most: Always choose European Roulette over American Roulette when you have the option. The house edge is 2.70% vs 5.26% — almost double — with identical payouts. This is explained fully in the next section.

The Most Important Choice

European vs American Roulette

The two most common versions of roulette look almost identical — same wheel, same table, same payouts. But one small difference changes everything: the American wheel has an extra green pocket (00), the double zero.

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European Roulette
37
pockets  ·  Single zero (0)
2.70%
HOUSE EDGE
✓ Recommended
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American Roulette
38
pockets  ·  Zero (0) + Double Zero (00)
5.26%
HOUSE EDGE
⚠ Higher house edge

Both wheels pay 35:1 for a straight-up (single number) bet. On the European wheel that number covers 1 of 37 pockets (2.70% win chance). On the American wheel it covers 1 of 38 (2.63% win chance). Same payout, lower probability — that gap is the house edge, and it compounds over every bet type across the table.

European vs American Roulette comparison
FeatureEuropeanAmerican
Pockets37 (0–36)38 (0, 00, 1–36)
House Edge2.70%5.26%
RTP97.30%94.74%
Straight-up win chance1/37 = 2.70%1/38 = 2.63%
Even-money win chance18/37 = 48.65%18/38 = 47.37%
La Partage ruleAvailable (edge → 1.35%)Not available
Five Number betNot availableAvailable — 7.89% edge ⚠️
Call bets (Voisins etc.)AvailableNot standard

The La Partage Rule — European Only

La Partage is an optional rule in European Roulette. When the ball lands on zero, instead of losing your entire even-money bet (Red/Black, Odd/Even, High/Low), half of your bet is returned to you. This reduces the house edge on even-money bets from 2.70% to just 1.35% — making it among the best bets in any casino.

The En Prison rule works similarly: instead of returning half immediately, your bet is "imprisoned" on the table for one more spin. If it wins, you get it back. If it loses, the casino keeps it.

⚠️
Avoid the American Five Number bet: The bet covering 0, 00, 1, 2 and 3 pays 6:1 but carries a house edge of 7.89% — the worst bet on the entire roulette table. It exists only because of the double zero. Never place it.

Step by Step

How to Play Roulette — Round by Round

1
Place Your Bets
Choose your chip value and place bets on the table before the spin. You can place multiple bets in a single round — inside bets, outside bets, or both. There is no limit to the number of bets you can cover simultaneously.
2
The Wheel Spins
The dealer (or the game) spins the wheel and launches the ball in the opposite direction. Once the ball is in motion, no more bets are accepted — the table is closed.
3
The Ball Lands
The ball slows and drops into a numbered pocket. The winning number is announced and marked on the table. Every bet that covers this number wins; all others lose.
4
Payouts Are Settled
Losing bets are swept from the table first. Winning bets are paid according to their payout ratio — a Straight Up bet pays 35:1, a Red/Black bet pays 1:1, and so on. Your original winning chips remain on the table unless you move them.
5
Next Round Begins
A new round begins immediately. You can adjust your bets, add new ones, or keep the same layout for the next spin. There is no carry-over between rounds — every spin is statistically independent.

All Bet Types

Roulette Bets — Inside & Outside

Roulette bets fall into two categories: Inside bets (placed on specific numbers on the inner grid) and Outside bets (placed on larger groupings around the edge of the table). Inside bets pay more but win less often. Outside bets pay less but win more frequently.

All payouts below use European Roulette odds (37 pockets). American Roulette has the same payouts but slightly lower win probabilities due to the extra 00 pocket.

Inside Bets — Higher Payouts
Straight Up
1 specific number
35:1
European: 2.70%  ·  American: 2.63%
Place chips directly on any single number, including 0 (and 00 in American). The highest-paying bet on the table.
Split
2 adjacent numbers
17:1
European: 5.41%  ·  American: 5.26%
Place chips on the line between two adjacent numbers on the grid. Wins if either number hits.
Street
3 numbers in a row
11:1
European: 8.11%  ·  American: 7.89%
Covers an entire horizontal row of three numbers (e.g. 1-2-3). Place chips on the outside edge of the row.
Corner (Square)
4 numbers in a square
8:1
European: 10.81%  ·  American: 10.53%
Covers four numbers that form a square on the grid (e.g. 1-2-4-5). Place chips at the corner where all four meet.
Six Line
6 numbers — 2 rows
5:1
European: 16.22%  ·  American: 15.79%
Covers two adjacent rows of three numbers (6 total). Place chips at the edge between two rows.
Five Number ⚠
0, 00, 1, 2, 3
6:1
American only: 13.16%
American Roulette only. House edge 7.89% — worst bet on the table. Avoid entirely.
Outside Bets — Higher Win Frequency
Red / Black
18 numbers (colour)
1:1
European: 48.65%  ·  American: 47.37%
Bet on all red numbers or all black numbers. Zero is green and loses this bet (unless La Partage applies).
Odd / Even
18 numbers (parity)
1:1
European: 48.65%  ·  American: 47.37%
Bet on all odd numbers (1, 3, 5…) or all even numbers (2, 4, 6…). Zero does not count as even and loses this bet.
High / Low
18 numbers (range)
1:1
European: 48.65%  ·  American: 47.37%
Low covers 1–18, High covers 19–36. Zero loses both. The cleanest, most straightforward roulette bet.
Dozen
12 numbers (1–12, 13–24, 25–36)
2:1
European: 32.43%  ·  American: 31.58%
Three dozen bets dividing the layout into thirds. Zero loses all dozen bets.
Column
12 numbers (vertical column)
2:1
European: 32.43%  ·  American: 31.58%
Three columns of 12 numbers each run vertically down the table layout. Zero is not part of any column.

Complete Reference

Roulette Bet Payouts at a Glance

Complete roulette payout and odds table
BetNumbers CoveredPayoutEuro Win %US Win %
Straight Up135:12.70%2.63%
Split217:15.41%5.26%
Street311:18.11%7.89%
Corner48:110.81%10.53%
Five Number ⚠️56:1N/A13.16%
Six Line65:116.22%15.79%
Dozen / Column122:132.43%31.58%
Red / Black181:148.65%47.37%
Odd / Even181:148.65%47.37%
High / Low181:148.65%47.37%
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Why do all bets have the same house edge? In European Roulette, every bet except the Five Number (American only) returns the same house edge of 2.70%. Whether you bet a single number at 35:1 or Red/Black at 1:1, the casino's mathematical advantage is identical. Choosing between bets is a question of volatility preference, not house edge optimisation.

The Wheel

Red & Black Numbers — Which is Which?

The 36 numbered pockets alternate between red and black. Zero (and double zero) are always green. The specific red/black assignment is fixed — these never change. 18 numbers are red, 18 are black.

Red: 1,3,5,7,9,12,14,16,18,19,21,23,25,27,30,32,34,36  ·  Black: 2,4,6,8,10,11,13,15,17,20,22,24,26,28,29,31,33,35  ·  Green: 0

Strategy Tips

Roulette Strategy — What Works and What Doesn't

Roulette is a game of pure chance. No betting system can change the house edge — each spin is statistically independent of every previous spin. However, understanding the math helps you make informed decisions.

1
Always play European over American
This is the single highest-value decision in roulette. European Roulette's house edge (2.70%) is nearly half of American's (5.26%). With identical payouts, there is never a mathematical reason to choose American Roulette.
2
Use La Partage when available — it's the best bet in roulette
European Roulette with La Partage on even-money bets gives a house edge of just 1.35%. This is comparable to Baccarat Banker (1.06%) and far better than almost any other mass-market casino bet. If La Partage is offered, place even-money bets.
3
Betting systems don't change the math — they change the variance
Martingale (double after every loss), D'Alembert, Fibonacci — none of these change the house edge. What they do is trade smaller wins for rare catastrophic losses. Martingale feels like it works until a long losing streak hits a table maximum. Use them for entertainment, not expectation.
4
Each spin is independent — "due numbers" don't exist
If Red has hit 10 times in a row, Red and Black are equally likely on the next spin (48.65% each in European). The wheel has no memory. The Gambler's Fallacy — believing a number is "due" — is the most expensive misconception in roulette.
5
Outside bets for longer play, inside bets for bigger wins
Same house edge, different volatility. Red/Black gives you close to a 50/50 flip every spin — your bankroll stays steady. Straight Up bets can return 35× on a single number — massive when it hits, but a long time between wins. Choose based on the experience you want, not mathematical advantage.
6
Avoid the American Five Number bet — always
The Five Number bet (0, 00, 1, 2, 3) pays 6:1 but has a 7.89% house edge — nearly three times the European house edge and the only roulette bet that breaks the otherwise uniform 5.26% American advantage. There is no situation where this bet is a good choice.
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House edge summary: European Roulette (even-money + La Partage) 1.35%  ·  European Roulette (all other bets) 2.70%  ·  American Roulette (standard) 5.26%  ·  American Five Number bet 7.89%. The choice of which table to sit at has a bigger impact on your expected return than any betting system.

Quick Reference

Roulette Terms Glossary

Roulette glossary
TermDefinition
Straight UpA bet on a single number. Pays 35:1.
SplitA bet on two adjacent numbers. Pays 17:1.
StreetA bet on three numbers in a horizontal row. Pays 11:1.
Corner / SquareA bet on four numbers forming a square on the grid. Pays 8:1.
Six LineA bet on six numbers covering two adjacent rows. Pays 5:1.
DozenOutside bet covering 12 numbers (1–12, 13–24, or 25–36). Pays 2:1.
ColumnOutside bet covering a vertical column of 12 numbers. Pays 2:1.
Even-money betRed/Black, Odd/Even, or High/Low — all pay 1:1 and cover 18 numbers.
House EdgeThe mathematical advantage the casino holds. European: 2.70%. American: 5.26%.
La PartageEuropean rule returning half of even-money bets when zero hits. Reduces house edge to 1.35%.
En PrisonAlternative to La Partage — even-money bets stay on the table for one more spin when zero hits.
Five Number betAmerican only. Covers 0, 00, 1, 2, 3. Pays 6:1. Worst bet on the table (7.89% house edge).
Voisins du ZéroEuropean call bet covering 17 numbers closest to zero on the wheel. Requires multiple chips.
OrphelinsEuropean call bet covering 8 numbers not included in Voisins or Tiers.
Tiers du CylindreEuropean call bet covering 12 numbers opposite to zero on the wheel.

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