What is the probability of 10 reds in a row in roulette?

In European roulette, the probability of red appearing 10 times consecutively is (18/37)^10 = 0.0566% — approximately 1 in 1,768. In American roulette it is (18/38)^10 = 0.0363%, or about 1 in 2,756. While rare, at busy casinos this occurs multiple times per day globally.

Does a winning or losing streak affect the next spin?

No. Roulette spins are completely independent events. A streak of 10 reds does not make black more likely on the next spin. This belief — that past outcomes influence future ones — is called the Gambler's Fallacy. The probability of red on every spin is always 48.65% (European) regardless of history.

How rare is a losing streak of 10 in roulette?

A losing streak of 10 on an even-money bet (red/black) has probability (19/37)^10 = 0.148% in European roulette — about 1 in 675. On a single number bet, 10 consecutive losses has probability (36/37)^10 = 76.2%, meaning it is very common to lose 10 times in a row when betting on a single number.

Roulette Streak Calculator — Consecutive Wins & Losses

What Is a Streak in Roulette?

A streak is a sequence of consecutive identical outcomes — for example, five reds in a row, or ten consecutive losses on an even-money bet. Streaks are a normal part of random sequences and occur more often than most people expect.

Understanding streak probabilities serves two purposes: it helps you set realistic expectations for how often extreme streaks will occur, and it helps you avoid the Gambler's Fallacy — the false belief that past results influence future spins.

The Gambler's Fallacy: If red has appeared 10 times in a row, many players believe black is "due." This is mathematically false. Each spin is completely independent. The probability of red on the next spin is always 48.649% (European roulette), regardless of what happened before.

How Streak Probabilities Are Calculated

The probability of any specific outcome occurring N times in a row is simply the single-spin probability raised to the power N:

P(N in a row) = p^N

For red in European roulette (p = 18/37 ≈ 0.4865):

2 reds in a row: 0.4865² = 23.67%
5 reds in a row: 0.4865⁵ = 2.70%
10 reds in a row: 0.4865¹⁰ = 0.0730%
15 reds in a row: 0.4865¹⁵ = 0.00197%

For a single number (p = 1/37 ≈ 0.02703):

2 hits in a row: 0.02703² = 0.0731%
3 hits in a row: 0.02703³ = 0.00198%

Quick Streak Reference Table — European Roulette

Streak Length	Red/Black (48.65%)	Column/Dozen (32.43%)	Single Number (2.70%)
2 in a row	23.67%	10.52%	0.073%
3 in a row	11.52%	3.41%	0.002%
5 in a row	2.73%	0.359%	0.0000143%
8 in a row	0.322%	0.012%	< 0.000001%
10 in a row	0.0730%	0.00134%	< 0.000001%

→ Use the full interactive calculator on the homepage | → How betting systems try (and fail) to use streaks