Roulette Probability Analyzer

Analyze winning probabilities, payouts, and house edge for every roulette bet type.

Roulette Bet Analyzer

Select your wheel type and bet to see the exact probability, payout, and house edge.

Select display currency.
Amount you plan to wager.
European (37 numbers), American (38 numbers), or French (37 with La Partage).
Choose the type of roulette bet to analyze.
La Partage returns half your stake on even-money bets when the ball lands on zero.

Understanding roulette probabilities

Roulette is purely a game of chance where every spin is independent. Understanding the math helps you make informed betting decisions.

Wheel types explained

European roulette has 37 pockets (0-36) with 2.7% house edge. American roulette adds a double zero (00), increasing numbers to 38 and house edge to 5.26%. French roulette uses European layout but offers La Partage/En Prison rules that reduce even-money bet house edge to 1.35%.

La Partage and En Prison rules

La Partage returns half your stake when zero hits on even-money bets. En Prison "imprisons" your bet for the next spin instead. Both rules cut the house edge in half for outside bets, making French roulette the best choice for players.

Inside vs outside bets

  • Inside bets (straight, split, street, corner, six line) cover fewer numbers with higher payouts.
  • Outside bets (dozens, columns, red/black, odd/even, high/low) cover more numbers with lower payouts.
  • The house edge is the same regardless of bet type on the same wheel.

Related Tools & Guides

Related Calculators

Baccarat Edge Calculator
Blackjack Side Bet Analysis
Slot Session Calculator

Roulette FAQ

On the same wheel, all bets have the same house edge. However, French roulette with La Partage offers the best odds for even-money bets (red/black, odd/even, high/low) at just 1.35% house edge. For other bet types, European roulette at 2.7% beats American at 5.26%.

No betting system can overcome the house edge in the long run. Systems like Martingale may produce short-term wins but require infinite bankroll and face table limits. Each spin is independent, so past results don't affect future outcomes.

American roulette has both 0 and 00, giving 38 pockets instead of 37. While payouts remain the same (35:1 for straight bets), the extra pocket nearly doubles the house edge from 2.7% to 5.26%. This means you lose about twice as fast playing American roulette.