Calculate the exact probability of any roulette bet hitting on a single spin or over multiple spins. Understand streak probabilities and expected outcomes.
Per Spin Probability
2.70%
1 in 37.0
P(Win in 37 spins)
63.7%
Expected Appearances
1.00
in 37 spins
P(2 in a row)
0.073%
European has better odds
Type of bet to analyze
Calculate probability over this many spins
Probability of winning this bet multiple times in a row:
Each roulette spin is completely independent. If red has appeared 10 times in a row, the next spin still has the same probability of being red (~48.65% on European). The wheel has no memory. "Due numbers" and "hot numbers" are gambling fallacies.
On a European wheel, the probability is 1/37 (2.70%). On an American wheel, it's 1/38 (2.63%). Over 37 spins on a European wheel, you have about a 63.4% chance of seeing your number at least once.
More spins increase the chance of your bet appearing at least once. However, each spin remains independent - previous results don't affect future spins. This is why "due numbers" is a myth.
On a European wheel, P(red) = 18/37 ≈ 48.65%. Five reds in a row has probability (18/37)^5 ≈ 2.73%. This is rare but happens regularly in casinos across thousands of spins.
No. Understanding probability helps set realistic expectations but can't overcome the house edge. Each spin is independent, and the house edge remains constant regardless of betting patterns or history.
Quick-start with common scenarios
Per Spin Probability
2.70%
1 in 37.0
P(Win in 37 spins)
63.7%
Expected Appearances
1.00
in 37 spins
P(2 in a row)
0.073%