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.
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.
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.
| Feature | European | American |
|---|---|---|
| Pockets | 37 (0–36) | 38 (0, 00, 1–36) |
| House Edge | 2.70% | 5.26% |
| RTP | 97.30% | 94.74% |
| Straight-up win chance | 1/37 = 2.70% | 1/38 = 2.63% |
| Even-money win chance | 18/37 = 48.65% | 18/38 = 47.37% |
| La Partage rule | Available (edge → 1.35%) | Not available |
| Five Number bet | Not available | Available — 7.89% edge ⚠️ |
| Call bets (Voisins etc.) | Available | Not 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.
Step by Step
How to Play Roulette — Round by Round
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.
Complete Reference
Roulette Bet Payouts at a Glance
| Bet | Numbers Covered | Payout | Euro Win % | US Win % |
|---|---|---|---|---|
| Straight Up | 1 | 35:1 | 2.70% | 2.63% |
| Split | 2 | 17:1 | 5.41% | 5.26% |
| Street | 3 | 11:1 | 8.11% | 7.89% |
| Corner | 4 | 8:1 | 10.81% | 10.53% |
| Five Number ⚠️ | 5 | 6:1 | N/A | 13.16% |
| Six Line | 6 | 5:1 | 16.22% | 15.79% |
| Dozen / Column | 12 | 2:1 | 32.43% | 31.58% |
| Red / Black | 18 | 1:1 | 48.65% | 47.37% |
| Odd / Even | 18 | 1:1 | 48.65% | 47.37% |
| High / Low | 18 | 1:1 | 48.65% | 47.37% |
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.
Quick Reference
Roulette Terms Glossary
| Term | Definition |
|---|---|
| Straight Up | A bet on a single number. Pays 35:1. |
| Split | A bet on two adjacent numbers. Pays 17:1. |
| Street | A bet on three numbers in a horizontal row. Pays 11:1. |
| Corner / Square | A bet on four numbers forming a square on the grid. Pays 8:1. |
| Six Line | A bet on six numbers covering two adjacent rows. Pays 5:1. |
| Dozen | Outside bet covering 12 numbers (1–12, 13–24, or 25–36). Pays 2:1. |
| Column | Outside bet covering a vertical column of 12 numbers. Pays 2:1. |
| Even-money bet | Red/Black, Odd/Even, or High/Low — all pay 1:1 and cover 18 numbers. |
| House Edge | The mathematical advantage the casino holds. European: 2.70%. American: 5.26%. |
| La Partage | European rule returning half of even-money bets when zero hits. Reduces house edge to 1.35%. |
| En Prison | Alternative to La Partage — even-money bets stay on the table for one more spin when zero hits. |
| Five Number bet | American only. Covers 0, 00, 1, 2, 3. Pays 6:1. Worst bet on the table (7.89% house edge). |
| Voisins du Zéro | European call bet covering 17 numbers closest to zero on the wheel. Requires multiple chips. |
| Orphelins | European call bet covering 8 numbers not included in Voisins or Tiers. |
| Tiers du Cylindre | European call bet covering 12 numbers opposite to zero on the wheel. |
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