Quick answer
European roulette has one zero and a typical 2.70% house edge; American roulette has zero and double zero and a typical 5.26% edge. The payout table is similar, so the extra pocket makes the American wheel more costly.
Key takeaways
- Check whether the wheel has one zero or two.
- Inside and outside bets trade hit frequency for payout size.
- Betting systems do not remove the house edge.
- Special rules such as la partage must be stated explicitly.
European versus American wheels
A European wheel has numbers 1–36 plus a single zero, for 37 pockets. An American wheel adds double zero, for 38 pockets. Because a straight number commonly pays 35:1 on both, the extra losing pocket increases the typical house edge from 2.70% to 5.26%.
Some variants add other symbols or multipliers. Treat them as different games and inspect the paytable.
Inside bets
Inside bets cover one or a small group of numbers: straight, split, street, corner, six line and related layouts. They hit less often but pay more. The exact chip position matters, especially on a small mobile screen.
Use the confirmation or bet list before the spin. Do not raise the stake merely because several numbers have not appeared recently.
Outside bets
Outside bets cover larger groups such as red/black, odd/even, low/high, dozens and columns. Even-money bets still lose to zero, so they are not 50/50 on a standard wheel. They reduce volatility relative to straight numbers but do not remove the edge.
Rules called la partage or en prison can reduce the cost of even-money wagers on some single-zero tables, but they must be explicitly offered.
Why systems do not beat roulette
Martingale, Fibonacci and similar systems change stake size after outcomes. They cannot change the wheel probability or payout ratio. Long losing sequences occur, and table limits or finite budgets prevent unlimited doubling.
Past-number boards are descriptive. A fair wheel does not owe a red result because black appeared repeatedly.
Choose a wheel and set limits
Confirm wheel type, minimum and maximum, chip value, auto-play behavior and special rules. Use a fixed session budget and small stake. Faster auto roulette can multiply total exposure even when the per-spin amount seems low.
If the lobby offers multiple categories, use our games list and risk guide to compare them.
Frequently asked questions
Which roulette wheel has the lower typical house edge?
A standard single-zero European wheel, at about 2.70%, compared with about 5.26% for double-zero American roulette.
Is red or black a 50/50 bet?
No. Zero—and double zero on American wheels—means the probability is below 50%.
Can Martingale guarantee a profit?
No. It does not alter the odds and can hit budget or table limits after a losing sequence.