Dont forget if you have to pay a lot gambling tax, you have won a lot
What are your actual chances of winning on any given roulette spin? This page answers that for every bet type, from a straight-up single number at 2.70% to even-money bets at 48.65%, and explains how win probability, payout and house edge interact. Understanding winning chances is the foundation of every rational roulette strategy.
How Win Probability Is Calculated
Every roulette bet’s win probability is a simple fraction: the number of pockets your bet covers, divided by the total number of pockets on the wheel.
On a European wheel with 37 pockets (numbers 0 to 36):
- Straight-up (1 number): 1 ÷ 37 = 2.70%
- Split (2 numbers): 2 ÷ 37 = 5.41%
- Red or Black (18 numbers): 18 ÷ 37 = 48.65%
The formula is consistent for every bet type on any roulette variant. Once you know it, you can work out the win probability of any bet yourself, including multi-number combinations like the Romanosky system (32 ÷ 37 = 86.49%) or the Kavouras system (20 ÷ 37 = 54.05%).
Winning Chances for Every Bet Type
| Bet type | Numbers covered | Win chance (EU) | Win chance (US) | Payout |
|---|---|---|---|---|
| Straight-up (single number) | 1 | 2.70% | 2.63% | 35:1 |
| Split (2 numbers) | 2 | 5.41% | 5.26% | 17:1 |
| Street (3 numbers, 1 row) | 3 | 8.11% | 7.89% | 11:1 |
| Corner (4 numbers) | 4 | 10.81% | 10.53% | 8:1 |
| Six Line / Double Street (6 numbers) | 6 | 16.22% | 15.79% | 5:1 |
| Column (12 numbers) | 12 | 32.43% | 31.58% | 2:1 |
| Dozen (12 numbers) | 12 | 32.43% | 31.58% | 2:1 |
| Red / Black | 18 | 48.65% | 47.37% | 1:1 |
| Even / Odd | 18 | 48.65% | 47.37% | 1:1 |
| Low / High (1 to 18 / 19 to 36) | 18 | 48.65% | 47.37% | 1:1 |
| Zero (straight-up) | 1 | 2.70% | 2.63% | 35:1 |
| Double Zero (US only) | 1 | N/A | 2.63% | 35:1 |
For full payout details on every bet type, see our complete odds and payouts table. For a specific payout calculation, use the roulette payout calculator.
European vs American: The Probability Difference
The American wheel has 38 pockets (0, 00 and 1 to 36) compared to 37 on the European wheel. This single extra pocket reduces your winning chances on every bet — the full three-way picture, including the French wheel, is set out in American vs European vs French roulette.
| Bet | European win % | American win % | Difference |
|---|---|---|---|
| Straight-up | 2.70% | 2.63% | −0.07% |
| Even-money | 48.65% | 47.37% | −1.28% |
| Dozen / Column | 32.43% | 31.58% | −0.85% |
| House edge | 2.70% | 5.26% | +2.56% more edge |
Dont forget if you have to pay a lot gambling tax, you have won a lot
Win Probability and House Edge: The Connection
The house edge emerges from the gap between your win probability and the payout you receive. For every bet in roulette, the payout is set slightly below what a fair game would pay:
| Bet | Fair payout (no edge) | Actual payout | Resulting house edge |
|---|---|---|---|
| Straight-up (EU) | 36:1 | 35:1 | 2.70% |
| Even-money (EU) | 1.056:1 (19÷18) | 1:1 | 2.70% |
| Straight-up (US) | 37:1 | 35:1 | 5.26% |
| Even-money (French, La Partage) | 1.056:1 (19÷18) | 1:1 plus half back on zero | 1.35% |
This is why the house edge is identical for all standard European roulette bets: the gap between fair payout and actual payout is calibrated to produce exactly 2.70% edge regardless of which bet you choose. For a complete house edge analysis see our house edge breakdown; for how that cost compares to other table games, see roulette vs blackjack vs poker.
Streaks, Variance and What to Expect Per Session
Knowing your win probability is different from knowing how any specific session will play out. Roulette outcomes are independent, with each spin having no memory of previous results. That means:
| Scenario | Probability | How often it happens |
|---|---|---|
| 3 reds in a row | 0.4865³ = 11.5% | About 1 in 9 sequences |
| 5 reds in a row | 0.4865⁵ = 2.7% | About 1 in 37 sequences |
| 10 reds in a row | 0.4865¹⁰ = 0.075% | About 1 in 1,330 sequences |
| Zero not appearing at all in 37 spins | (36/37)³⁷ = 36.3% | More than 1 in 3 full cycles |
| Your number not hitting in 100 spins | (36/37)¹⁰⁰ = 6.5% | About 1 in 15 sessions |
Which Bets Give You the Best Winning Chances?
A common misconception is that higher-paying bets are somehow worse for the player. In fact, all European roulette bets carry the same 2.70% house edge, whether you bet on a single number at 35:1 or red/black at 1:1.
The real question is what kind of session experience you want:
French Roulette: Better Even-Money Chances
The only way to genuinely improve your winning chances in roulette is to choose a variant with a lower house edge. French Roulette with La Partage is the best option available.
The La Partage rule returns half your even-money bet when zero lands. This effectively reduces the house edge on even-money bets from 2.70% to 1.35%. Over 100 spins at €10 per spin, that saves €13.50 in expected losses compared to European roulette.
This is the only mathematical improvement available to players: variant selection, not bet selection. See our French Roulette breakdown for the full detail.
Frequently Asked Questions
What are the odds of winning at roulette?
It depends entirely on which bet you place. Even-money bets (red/black, even/odd) win 48.65% of the time on a European wheel. Straight-up single numbers win 2.70% of the time. The house edge is 2.70% on all bets, meaning over the long run you lose an average of €2.70 per €100 staked.
What number hits the most in roulette?
On a fair wheel, every number has an equal 2.70% (1/37) probability of hitting. No number hits more than any other in the long run. Short-term “hot numbers” are a product of normal statistical variance, not bias. See our hot and cold numbers analysis for the full statistical picture.
Which roulette bet has the best odds?
All European roulette bets carry the same 2.70% house edge, so there is no single “best” bet mathematically. For the highest win frequency, choose even-money bets (48.65% win rate). For the biggest single-spin upside, choose straight-up numbers (35:1 payout). For the lowest possible house edge overall, play French Roulette with La Partage (1.35%).
Can I improve my chances of winning at roulette?
Yes, by choosing a better variant. Playing French Roulette with La Partage instead of European roulette cuts the house edge from 2.70% to 1.35% on even-money bets. Playing European instead of American roulette cuts it from 5.26% to 2.70%. No betting system or number selection improves your win probability beyond what the variant offers.