Roulette EV Calculator
Stop guessing your odds. Use our advanced calculator to find the exact Expected Value (EV) and mathematical House Edge on any inside or outside bet. Calculate the impact of American vs European wheels.
How to Use the Roulette Odds Calculator
Roulette mathematics are fixed, unlike Blackjack. Your probability of winning is entirely dependent on the wheel type (number of zeroes) and the board coverage of your specific bet. The Roulette Expected Value (EV) Calculator computes your projected monetary return over time, proving mathematically why certain wheels drain your bankroll faster.
Choose between European (37 slots) and American (38 slots) wheels, select your wager format, and our tool outputs your exact mathematical handicap.
⚠️ The Double-Zero Tax (American Roulette)
American roulette wheels feature both a single zero (0) and a double zero (00). This additional pocket provides zero benefit to the player while practically doubling the house edge from 2.70% to 5.26%. Statistically, an extended session on an American table guarantees a faster rate of loss. Always filter online lobbies for European variants.
Inside vs. Outside Bets: Variance Explained
The total house edge remains constant across almost all standard roulette bets, but the variance (volatility) shifts wildly.
Inside Bets (High Variance)
Straight up bets, splits, and corners. A single number pays 35:1 but only hits 2.7% of the time (European). You will experience longer losing streaks, balanced by massive individual payouts.
Outside Bets (Low Variance)
Red/Black, Odd/Even, High/Low. These bets cover almost half the board and pay out 1:1 (Even money). This offers a steadier session, ideal for clearing casino bonuses.
FAQ - Roulette Math
Does the Martingale Strategy overcome House Edge?
No. The Martingale (doubling your bet after a loss) does not alter the fundamental house edge. It merely shifts your risk profile: you will experience many small wins, eventually interrupted by one massive catastrophic loss when you hit table limits or run out of bankroll.
What is the "La Partage" rule?
Found primarily on French Roulette tables, "La Partage" states that if the ball lands on zero, players who made even-money bets (like Red or Black) receive half their bet back. This cuts the house edge in half to just 1.35% on those specific wagers.
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