The odds of winning in roulette vary by bet type. For a straight-up bet on a single number, the odds are 2.63% in European roulette and 2.63% in American roulette. A split bet covering two numbers offers odds of 5.26%, while a street bet, which covers three numbers, has odds of 7.89%. For outside bets, such as red or black, odd or even, and high or low, the odds are closer to 48.65% in European roulette and 47.37% in American roulette, considering the presence of the green zero (or double zero in American). The more numbers you cover, the better your chances, but the payouts decrease accordingly.