Roulette odds — exactly
Single number: 1 in 37 (EU). Red: 48.65%. Zero: 2.70% per spin — about 94% chance of appearing at least once in 100 spins. And the exclusive: exact within-session streak odds below — a 7+ red run appears in 48% of 200-spin sessions.⚙ computed
Streaks: will you see one?
| Run length | Fixed window | Seen in 100 spins | In 200 spins | |
|---|---|---|---|---|
| 3 reds | 11.51% | 100.0% | 100.0% | page → |
| 4 reds | 5.60% | 96.2% | 99.9% | page → |
| 5 reds | 2.72% | 77.0% | 95.0% | page → |
| 6 reds | 1.33% | 49.5% | 75.2% | page → |
| 7 reds | 0.64% | 27.5% | 48.4% | page → |
| 8 reds | 0.31% | 14.2% | 27.1% | page → |
| 9 reds | 0.15% | 7.1% | 14.1% | page → |
| 10 reds | 0.07% | 3.5% | 7.1% | page → |
| 12 reds | 0.02% | 0.8% | 1.7% | page → |
| 15 reds | 0.0020% | 0.1% | 0.2% | page → |
Per-bet odds
Every bet’s exact win probability, hit frequency and volatility lives on its own page — start at the payout chart or jump to straight up, red, dozens.
Hands-on: spin batches of numbers with a live hot/cold board, or price any bet instantly.
How roulette’s odds rank against blackjack, baccarat and slots: the honest league table.
Zero facts
Zero hits like any number — 1 in 37 spins — which means “how often does zero hit” has a clean answer: 2.70% per spin, ~64% chance within 37 spins, near-certainty across an evening. Same-number repeats: twice in a row is 1 in 1,369; the follow-up spin matching the last is always just 1/37, whatever the history.
Frequently asked
What are the odds of hitting zero in roulette?
2.70% per spin on a European wheel (1 in 37). Over 100 spins zero appears at least once about 94% of the time.
What is the probability of the same number twice in a row?
1 in 1,369 for a chosen number on consecutive EU spins (1/37 × 1/37). For “the next spin repeats whatever just hit” it’s simply 1/37 — 2.70%.