Roulette Calculator
Odds and edge for every bet type
Roulette pays every bet as if the zero did not exist, and that missing pocket is the entire house edge. A straight-up number pays 35 to 1 but wins only 1 in 37 spins on a European wheel, and 1 in 38 on an American one.
Pick a bet type and a wheel to see the exact win probability, payout, expected value and the odds of not hitting your bet across a full session.
One single number. Simulated as 17.
French wheels return half your stake on zero for even-money bets.
Win chance
2.70%
1 in 37.0
Payout
35 to 1
Returns 36.0000x of the stake
House edge
2.70%
Expected value $-0.27 per spin
No hit in 50 spins
25.41%
Spin the wheel
Every spin draws a real pocket from the 37-pocket european wheel. The green pockets are the whole house edge.
Pocket frequency over the run
- Spins played
- 0
- Observed hit rate
- —
- Expected hit rate
- 2.70%
- Zeros so far
- 0
Same stake every round.
0 = no limit. This is where real progressions die.
Stop once you are up this much. 0 = never.
Stop once you are down this much. 0 = never.
- Net result
- +$300.00
- Total wagered
- $1,500
- Win rate
- 3.33%
- Max drawdown
- $530
- Longest losing streak
- 53
- Peak balance
- $1,470
- Biggest single win
- $350.00
- Ended by
- Session length
1,000 simulated sessions
150 spins on the straight up (1 number). A martingale on an even-money bet looks unbeatable here until the max-bet cap or the bankroll runs out — set both above and watch the bust share move.
| Bet | Payout | Win chance | Profit | House edge |
|---|---|---|---|---|
| Straight up (1 number) | 35 to 1 | 2.70% | $350.00 | 2.70% |
| Split (2 numbers) | 17 to 1 | 5.41% | $170.00 | 2.70% |
| Street (3 numbers) | 11 to 1 | 8.11% | $110.00 | 2.70% |
| Corner (4 numbers) | 8 to 1 | 10.81% | $80.00 | 2.70% |
| Six line (6 numbers) | 5 to 1 | 16.22% | $50.00 | 2.70% |
| Column (12 numbers) | 2 to 1 | 32.43% | $20.00 | 2.70% |
| Dozen (12 numbers) | 2 to 1 | 32.43% | $20.00 | 2.70% |
| Red / Black | 1 to 1 | 48.65% | $10.00 | 2.70% |
| Even / Odd | 1 to 1 | 48.65% | $10.00 | 2.70% |
| High / Low | 1 to 1 | 48.65% | $10.00 | 2.70% |
Every bet on the layout carries the same house edge on a given wheel — 2.70% European, 5.26% American, 1.35% on even-money French bets. The simulation spins the real pocket order, so zeros land exactly as often as they do on the felt.
How to read the results
- European wheels (single zero) carry a 2.70% house edge on every bet.
- American wheels add a double zero, pushing the edge to 5.26% — avoid them when a European table is available.
- French wheels apply la partage: even-money bets lose only half the stake on zero, which halves the edge to 1.35%.
- No bet on the layout beats another on expected value; they only differ in variance.
Frequently asked questions
What is the house edge in roulette?
2.70% on a European single-zero wheel, 5.26% on an American double-zero wheel, and 1.35% on even-money bets at a French table with la partage or en prison.
What are the odds of hitting a single number?
1 in 37 (2.70%) on a European wheel and 1 in 38 (2.63%) on an American wheel. The payout is 35 to 1 in both cases, which is where the edge comes from.
Do roulette systems like Martingale beat the edge?
No. Progressions rearrange when you win and lose but never change the expected value of a spin. Use the Martingale calculator to see the bankroll a progression actually needs and how often it busts.
Related calculators
These tools are informational. They describe the mathematics of casino games; they do not predict outcomes and no calculator can overcome a house edge. Gambling involves real financial risk — 18+ only, and seek help if it stops being entertainment.