This is because there are 18 red numbers and 18 black numbers on the wheel, so each has a 48.6% chance of being the winning number. The odds of winning a bet on red or black are equal, at 48.6%. This is known as an even-money bet, as you will have the same odds of winning as you do of losing. The payout for betting on red or black in roulette is one-to-one, meaning that if you bet $5 on red and the ball lands on red, you will win back your original $5 bet, plus an additional $5 for your win.
