Here are a bunch of charts and tables for different probabilities in both European and American roulette.

There's also some handy ♣ (but not necessarily easy) information at the bottom about working out roulette probabilities, plus a little bit on the gambler's ♣ fallacy.

1. European roulette

Probability of each bet type winning on a European roulette wheel.

Bet Type Fraction Ratio Percentage Even (e.g. Red/Black) ♣ 1/2.06 1.06 to 1 48.6% Column 1/3.08 2.08 to 1 32.4% Dozen 1/3.08 2.08 to 1 32.4% Six Line 1/6.17 ♣ 5.17 to 1 16.2% Corner 1/9.25 8.25 to 1 10.8% Street 1/12.33 11.33 to 1 8.1% Split 1/19.50 18.50 to ♣ 1 5.4% Straight 1/37.00 36.00 to 1 2.7%