Casino guide
Online Roulette: Rules, Odds & House Edge
Compare single-zero and double-zero roulette with calculated probabilities, payouts and house edge. Understand side bets and the limits of betting systems.
Read the wheel before the payout table
A standard single-zero wheel has 37 pockets: 18 red, 18 black and one zero. A standard double-zero wheel has 38 pockets, adding 00. Both zero pockets lose a conventional red/black bet unless a stated rule modifies settlement.
For a one-unit red bet paying one unit of profit on a win, the single-zero expectation is (18/37 × 1) − (19/37 × 1) = −1/37. The negative expectation corresponds to a 2.70% house edge. Double zero gives (18/38 × 1) − (20/38 × 1) = −2/38, or 5.26%.
Probability and payout are different quantities
A straight-up number bet on a standard wheel pays 35:1 profit, plus the original stake. On a single-zero wheel its expectation is (1/37 × 35) − (36/37 × 1) = −1/37. A large payout does not mean a larger chance of winning.
These figures assume standard payouts and no special rules. Rules such as la partage can reduce the edge on qualifying even-money bets; multiplier or special-bet variants need their own calculation.
Scroll horizontally to see every column.
| Measure | Single zero | Double zero |
|---|---|---|
| Pockets | 37 | 38 |
| Red probability | 18/37 ≈ 48.65% | 18/38 ≈ 47.37% |
| Standard red-bet edge | 1/37 ≈ 2.70% | 2/38 ≈ 5.26% |
| Straight-up hit probability | 1/37 | 1/38 |
Live and automated roulette
Live roulette streams physical equipment and uses a timed interface. An automated version resolves outcomes through software. Compare the wheel, payout table and settlement rules in either format; the word live does not change the arithmetic.
A practice version can explain chips and table controls. It does not test identity checks, geographic eligibility, deposit processing or withdrawals.
Why a progression does not remove the edge
In a model with independent spins, previous reds do not make black due on the next spin. Doubling a stake after a loss changes the amount exposed, not the probability of the next result. Table limits and a finite balance can stop a progression.
House edge is a long-run expectation, not a promise that every session loses exactly that percentage. Consider total stakes across all rounds: repeatedly staking the same balance increases turnover and the amount exposed to the game’s edge.
Questions, answered
Does double-zero roulette have the same odds as single zero?
No. The additional zero changes the number of losing outcomes for standard even-money bets.
Can a betting system guarantee a profit?
No. Changing stake size does not remove a negative expectation and can increase losses.
Independent editorial information. No gaming service, deposits or real-money play.