How Many Black Slots Are on a Roulette Wheel?

A black slot on a roulette wheel is one of the 38 possible outcomes when the ball is spun. It is also one of the 18 even-money bets, which pays 1-to-1.

The probability of hitting a black slot is 18/38, or 47.37%.

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The black slots on a roulette wheel are alternated with red slots. There are eighteen black slots and eighteen red slots.

PRO TIP:Roulette wheels have 18 black slots, 18 red slots, and one green slot. The green slot is the house slot and pays out differently than the other 36 slots. If playing European roulette, the house edge is 2.7%, while American roulette has a higher house edge of 5.26%.

The probability of the ball landing in a black slot is the same as the probability of it landing in a red slot.

The probability of hitting a black slot is 47.

This means that if you bet on black, you can expect to win 47.37% of the time.