Roulette Sector Betting Calculator
Calculate odds and payouts for roulette sector bets including Voisins du Zéro, Tiers du Cylindre, Orphelins, and custom neighbor bets.
Formula:
P(win) = Numbers / Total Wheel NumbersCoverage
17 numbers
45.9% of wheel
Total Bet
$45
9 chips
House Edge
2.7%
Win Probability
45.95%
Neighbors of Zero - covers 17 numbers near 0
European has better odds
$
Amount on each chip
Numbers Covered (17)
22182972812353260321519421225
Classic Sectors Comparison
| Sector | Numbers | Chips | Coverage |
|---|---|---|---|
| Voisins du Zéro | 17 | 9 | 45.9% |
| Tiers du Cylindre | 12 | 6 | 32.4% |
| Orphelins | 8 | 5 | 21.6% |
| Jeu Zéro | 7 | 4 | 18.9% |
European Wheel Sections
Voisins (46%)Tiers (32%)Orphelins (22%)
Together these sectors cover the entire wheel
Key Facts
- •Sector bets cover physically adjacent wheel numbers
- •Voisins du Zéro covers 17 numbers (46% of wheel)
- •Tiers du Cylindre covers 12 numbers (32% of wheel)
- •Orphelins covers the remaining 8 numbers (22%)
- •House edge is unchanged by betting pattern
- •Useful for exploiting potential wheel biases
Frequently Asked Questions
What is sector betting in roulette?
Sector betting covers groups of numbers that are physically adjacent on the roulette wheel (not the table layout). Popular sectors include Voisins du Zéro (17 numbers around zero), Tiers du Cylindre (12 numbers opposite zero), and Orphelins (8 remaining numbers).
Does sector betting reduce the house edge?
No. Sector betting does not change the house edge - it remains 2.70% on European wheels and 5.26% on American wheels. However, it allows you to bet on physically adjacent numbers, which some believe can be exploited if a wheel has bias.
What is a neighbors bet?
A neighbors bet covers a chosen number plus typically 2 numbers on each side of it on the wheel (5 numbers total). Each number gets a straight-up bet. This is popular for players who believe certain wheel sections hit more often.
What is Voisins du Zéro?
Voisins du Zéro ("Neighbors of Zero") covers 17 numbers from 22 to 25 on the wheel, centered around zero. It requires 9 chips placed on specific splits and corners, covering about 46% of the wheel.
Try These Examples
Quick-start with common scenarios
How this works
Calculations follow the published mathematics of the game — combinatorics for cards, probability theory for dice, and expected-value accounting for wagers. Results are verified against independent references (primarily Wizard of Odds). No calculation here is an opinion or recommendation; it is arithmetic applied to the rules of the game.
What this tool can’t do
When to consult a professional
This tool computes probability and expected value. It is not a betting system and cannot predict the outcome of any individual wager. If gambling is causing problems for you or someone you know, call the National Problem Gambling Helpline at 1-800-GAMBLER.
Sources
- [1]Wizard of Odds — Michael Shackleford, ASAIndustrywizardofodds.comAccessed Apr 21, 2026
Actuary; widely cited casino-game probability reference. Used for house-edge and EV verification.
- [2]National Council on Problem GamblingOfficial sourcencpgambling.orgAccessed Apr 21, 2026
Responsible-gambling guidance and 1-800-GAMBLER helpline.
Joseph OrdunaFounder & Software Engineer
Full-stack software engineer specializing in embedded systems, web architecture, and AI/ML. Founder of Practical Web Tools. Built the gesture-controlled drone IP acquired by KD Interactive (Aura Drone, sold on Amazon).
Coverage
17 numbers
45.9% of wheel
Total Bet
$45
9 chips
House Edge
2.7%
Win Probability
45.95%