Roulette: Overview, Rules, Variants, Bets and History

Equipment and play

The primary components are the wheel, the ball and the betting layout on the table. The wheel contains sequentially numbered pockets, each painted red or black except for one or two green zero pockets. The dealer spins the wheel in one direction and launches the ball in the opposite direction; when it loses momentum the ball falls into a pocket and that pocket's number and color determine winning bets.

Main variants and house edge

Two widely played forms are European (single-zero) and American (double-zero) roulette. European wheels have 37 pockets (numbers 1–36 and 0), while American wheels add a 00 for 38 pockets. The presence of the extra 00 increases the house edge: single-zero roulette typically yields about a 2.7% house edge, while double-zero games have a higher edge around 5.26%. Some casinos or rule sets offer reductions such as la partage or en prison that affect even-money bets when the ball lands on zero, lowering the effective house advantage.

Bets and common payouts

Bets fall into two broad categories: inside bets on specific numbers or small groups, and outside bets on larger categories. Typical payouts include:

• Straight (single number): 35 to 1
• Split (two numbers): 17 to 1
• Street (three numbers): 11 to 1
• Corner (four numbers): 8 to 1
• Six-line (six numbers): 5 to 1
• Dozens/Columns: 2 to 1
• Even-money bets (red/black, odd/even, high/low): 1 to 1

History and cultural notes

Roulette developed in France and became widely popular across Europe in the 18th and 19th centuries; the word itself comes from French, a diminutive of "roue" (French) and etymological notes are often linked to the term diminutive. Over time the game spread to American casinos where rule changes produced the double-zero variant. Myths about its invention include stories attributing the device to early attempts at perpetual motion, but historical sources point to gradual evolution from earlier wheel games.

Strategy and considerations

While many betting systems and strategies have been proposed (for example progressive stakes like the Martingale), none alter the mathematical advantage inherent to the wheel. Players should understand that roulette is a game of chance: probabilities for individual numbers remain fixed and the house edge ensures a long-term advantage to the operator. Modern offerings include electronic wheels and live-dealer versions, but the core mechanics and odds remain consistent across formats.