Roulette Odds & Probabilities

Understanding the math behind every bet helps you make smarter decisions at the table.

House Edge by Variant

The house edge is the mathematical advantage the casino has on every bet. It comes from the green zero pockets — they are not covered by any outside bet, but they reduce the odds of winning. The more zeros on the wheel, the higher the house edge.

European (0)

2.70%

37 pockets

American (00)

5.26%

38 pockets

Triple (000)

7.69%

39 pockets

Win Probability by Bet Type

BetEuroAmerTriplePays

Straight Up2.70%2.63%2.56%35:1

Split5.41%5.26%5.13%17:1

Street8.11%7.89%7.69%11:1

Corner10.81%10.53%10.26%8:1

Double Street16.22%15.79%15.38%5:1

Dozens / Column32.43%31.58%30.77%2:1

Red / Black48.65%47.37%46.15%1:1

Odd / Even48.65%47.37%46.15%1:1

High / Low48.65%47.37%46.15%1:1

What the Numbers Mean

Every roulette bet has a negative expected value — meaning over time, the house always wins. A 2.7% house edge on European roulette means that for every $100 wagered, you can expect to lose $2.70 on average over the long run.

This does not mean you lose every time. In the short term, variance creates winning and losing streaks. A straight-up bet wins only 2.7% of the time, but when it does, the 35:1 payout creates a significant profit.

European roulette gives you the best mathematical odds. If you are choosing between variants, European is always the smartest choice from a pure probability standpoint.

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