Losing 9 Spins in a Row at 1.2x
The chance of 9 losing spins in a row at 1.2x on the Wheel is 3.81 × 10-4%, or 1 in 262,144. At 1.2x a single spin loses 25% of the time.
The odds of 9 losses in a row
| Measure | Value |
|---|---|
| Chance of one loss at 1.2x | 25% |
| Chance of 9 losses in a row, starting from a given spin | 3.81 × 10-4% |
| Odds | 1 in 262,144 |
| Spins to wait for it, on average | 349,524 |
| Chance it happens at least once in 100 spins | 0.0264% |
| Chance it happens at least once in 500 spins | 0.1408% |
| Chance it happens at least once in 1,000 spins | 0.2835% |
| Chance it happens at least once in 10,000 spins | 2.818% |
| Stake lost across the streak (1 per spin) | 9 |
| Stake a double-after-every-loss plan would need to survive it | 511 |
The average wait counts spins until the first run of 9 losses is completed. It is an average over many players, and any individual can see it on their first 9 spins or never. The "at least once" figures are exact: they account for a run starting on any spin, not just the first.
What it means
A streak of 9 losses has a probability of 25% to the power of 9, which is 3.81 × 10-4%. It is rare for any one run of 9 spins, but it does not stay rare if you keep going: across 500 spins the chance that it appears at least once is 0.1408%.
The next spin is not owed a win. After 8 losses the chance of a win on the next spin is still exactly 75%. The wheel has no memory, and a fresh provably fair roll is generated for each spin. Believing a win is overdue is the gambler's fallacy, and it is the most common reason stakes grow during a bad run.
Doubling after a loss does not fix it. Doubling the stake until a win needs 29 − 1 times your first stake to survive 9 losses in a row, and a table limit or an empty balance ends the plan well before the maths evens out. The 10% house edge applies to every stake in the plan, so betting more does not change the expected loss per unit staked.
Related
- 8 losses in a row at 1.2x
- 10 losses in a row at 1.2x
- Every losing streak at 1.2x
- The 1.2x multiplier in full
- 9 losses in a row at 1.1x
- 9 losses in a row at 1.25x
- 9 losses in a row at 1.3x
- 9 losses in a row at 1.4x
- 9 losses in a row at 1.5x