Last updated: April 13, 2026
10 Million Spins: Do Hot Numbers and Streaks Actually Exist?
After 10 reds in a row, is black 'due'? We spun 10 million times to test the gambler's fallacy with hard data. The roulette wheel has no memory.
Every roulette table has a display board showing the last 10-20 results. Casinos put them there for a reason: players see patterns and bet accordingly. After 8 reds, the crowd piles onto black. When number 17 hits three times in an hour, half the table starts betting 17. We ran 10 million spins to see if any of it holds up.
The gambler's fallacy is the belief that past outcomes influence future independent events. 'Red is due' after a long black streak. 'That number is hot.' These beliefs feel intuitive because our brains are wired to find patterns, even in randomness. But roulette spins are independent. Each spin, the ball has no memory of what happened before.
We built an experiment that lets you test this yourself. Run millions of European roulette spins and examine the data: conditional probabilities after streaks, number frequency distributions, and streak length patterns. The results speak for themselves.
Configuration
Methodology
Every spin simulates a European roulette wheel with 37 pockets (0-36). The random number generator produces uniformly distributed integers from 0 to 36. Red numbers: 1, 3, 5, 7, 9, 12, 14, 16, 18, 19, 21, 23, 25, 27, 30, 32, 34, 36. Black numbers: 2, 4, 6, 8, 10, 11, 13, 15, 17, 20, 22, 24, 26, 28, 29, 31, 33, 35. Zero is green.
For conditional probability analysis, we track the color of the spin immediately following every streak of N consecutive same-color results (N=1 to 15). For number frequency, we count how many times each of the 37 numbers appears and compare to the expected value (total spins / 37). Streak distribution counts how many streaks of each length occurred during the simulation.
The Verdict
After every streak length we tested, from 1 red in a row to 15 reds in a row, the probability of the next spin being red remains approximately 48.6% (18/37). The probability of black remains approximately 48.6%. The probability of green remains approximately 2.7% (1/37). The wheel does not compensate for past results.
Hot and cold numbers are statistical noise. With enough spins, every number converges toward the same expected frequency. The 'hottest' number in any sample deviates from expected by only a few percent, well within the range predicted by normal statistical variance. Casinos display recent results because it makes players bet more, not because the information is useful.
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