The odds for green in roulette depend on the version of the game. Since the American wheel has two green pockets, the odds of hitting either of them are 2-in-38, or 5.26%. In the European format, this drops to just 2.70% since there is one only green pocket on the wheel. Note that the payout will be 17:1 for the total bet in the American version and 35:1 in the European one.