Roulette Bet Calculator
Professional roulette math tool. Calculate payout, odds, expected value and bankroll projections for European and American wheels.
Spin History Tracker(0 spins)
How Roulette Odds Work
This free roulette calculator helps you understand the real math behind every roulette bet. Instantly calculate payout, win probability, house edge, and odds for both European (single zero) and American (double zero) wheels.
Unlike simple payout charts, this roulette odds calculator compares theoretical probability with implied probability derived from the payout ratio. This allows you to see the exact house edge built into every bet type.
Whether you are betting on red/black, columns, dozens, or straight numbers, the roulette probability calculator shows:
- Win probability and loss probability
- Payout ratio and decimal odds
- House edge for European and American wheels
- Numbers covered by each bet type
You can also use the spin history tracker to log recent outcomes and analyze observed frequencies without relying on guesswork.
European vs American Roulette – Probability Differences
The key difference between European and American roulette is the number of pockets on the wheel. European roulette has 37 pockets (numbers 1–36 plus a single zero), while American roulette has 38 pockets (an additional double zero).
This single extra pocket changes every roulette probability calculation:
| Bet Type | European Win % | American Win % | House Edge (EU / US) |
|---|---|---|---|
| Red / Black | 48.65% | 47.37% | 2.70% / 5.26% |
| Odd / Even | 48.65% | 47.37% | 2.70% / 5.26% |
| Dozen | 32.43% | 31.58% | 2.70% / 5.26% |
| Straight Up | 2.70% | 2.63% | 2.70% / 5.26% |
The roulette implied probability from the payout (e.g. 1:1 implies 50%) is always higher than the actual win probability. The gap between the two is the house edge.
Complete Roulette Odds Table (European & American)
The table below covers every standard roulette bet type available on both European and American wheels. All house edge values are calculated from the payout structure, not from any mechanical bias. Every bet on a European wheel carries exactly the same 2.70% house edge. On an American wheel, all standard bets carry 5.26%, with the five-number bet reaching 7.89%.
The difference between bet types is not house edge — it is volatility. A straight-up bet on a single number wins rarely but pays 35:1. An outside bet like red/black wins nearly half the time but pays only 1:1. The EV per dollar wagered is identical across all standard bets on the same wheel type.
Use this roulette odds table as a reference when choosing bet types. Understanding implied probability versus theoretical probability is the foundation of any rational betting approach.
| Bet Type | # | Payout | Win % | House Edge | EV / $1 |
|---|---|---|---|---|---|
| Straight Up (Single Number) | 1 | 35:1 | 2.70% | 2.70% | $-0.03 |
| Split (2 Numbers) | 2 | 17:1 | 5.41% | 2.70% | $-0.03 |
| Street (3 Numbers) | 3 | 11:1 | 8.11% | 2.70% | $-0.03 |
| Corner / Square (4 Numbers) | 4 | 8:1 | 10.81% | 2.70% | $-0.03 |
| Six Line / Double Street | 6 | 5:1 | 16.22% | 2.70% | $-0.03 |
| Dozen (12 Numbers) | 12 | 2:1 | 32.43% | 2.70% | $-0.03 |
| Column (12 Numbers) | 12 | 2:1 | 32.43% | 2.70% | $-0.03 |
| Red / Black | 18 | 1:1 | 48.65% | 2.70% | $-0.03 |
| Odd / Even | 18 | 1:1 | 48.65% | 2.70% | $-0.03 |
| High / Low (1-18 / 19-36) | 18 | 1:1 | 48.65% | 2.70% | $-0.03 |
EV (Expected Value) per $1 wagered. All values are negative, reflecting the built-in house advantage. European wheel house edge: 2.70% on all standard bets.
FAQ About Roulette Odds & Probability
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