Roulette looks like the most varied game on the floor. Thirty-odd betting positions, inside and outside, single numbers and broad colour bets, each with a different payout. It gives a strong impression that bet selection is where the skill sits.
It is not. With one specific exception, every bet on a European wheel carries exactly the same house edge, and the differences between them are differences in variance rather than in cost. What genuinely changes the maths is not which bet you place but which wheel you place it on — and that is a decision made before the first spin, in the lobby.
The wheel is the entire calculation
A European wheel has 37 pockets: numbers 1 through 36 plus a single zero. A straight bet on one number wins once in 37 spins on average and pays 35 to 1. That gap between the true odds and the payout is the house edge, and it works out to 2.70%.
An American wheel adds a double zero, making 38 pockets. The payout stays at 35 to 1. The edge nearly doubles, to 5.26%.
Same game, same rules, same table experience — and one extra pocket costing you twice as much per hour. Comparing wheel types across live lobbies shows both variants sitting side by side more often than players notice, which is why the wheel type is worth confirming in the table info before joining, something readily visible on platforms that list full table specifications up front, Caswino casino online among them.
There is also a triple-zero variant in circulation, with 39 pockets and an edge of 7.69%. It is uncommon online but exists, and it is the worst version of the game by a wide margin.
Every bet type, compared
The figures below are for a single-zero European wheel.
| Bet | Covers | Payout | Win probability | House edge |
|---|---|---|---|---|
| Straight | 1 number | 35:1 | 2.70% | 2.70% |
| Split | 2 numbers | 17:1 | 5.41% | 2.70% |
| Street | 3 numbers | 11:1 | 8.11% | 2.70% |
| Corner | 4 numbers | 8:1 | 10.81% | 2.70% |
| Six line | 6 numbers | 5:1 | 16.22% | 2.70% |
| Column | 12 numbers | 2:1 | 32.43% | 2.70% |
| Dozen | 12 numbers | 2:1 | 32.43% | 2.70% |
| Red / Black | 18 numbers | 1:1 | 48.65% | 2.70% |
| Odd / Even | 18 numbers | 1:1 | 48.65% | 2.70% |
| High / Low | 18 numbers | 1:1 | 48.65% | 2.70% |
| Five-number (American only) | 0, 00, 1, 2, 3 | 6:1 | 13.16% | 7.89% |
The final column is the point of the table. Every European bet returns the identical 2.70% edge, because each payout is scaled precisely to its probability with the same proportional shortfall built in. Spreading chips across a dozen positions does not lower your cost; it lowers your variance while costing exactly the same per dollar staked.
The one genuine outlier is the five-number bet on American wheels, at 7.89% — the worst single bet available in mainstream roulette, and the only bet in the game where the choice itself is a mistake rather than a preference.
The exception worth looking for: French rules
French roulette uses the same single-zero wheel but adds a rule that materially changes even-money bets.
La partage returns half your stake on red/black, odd/even and high/low bets when the ball lands on zero. En prison instead holds the bet for one more spin, returning it in full if the next spin wins.
Either rule cuts the house edge on even-money bets from 2.70% to 1.35% — half. That is a bigger improvement than anything available in slots and puts even-money roulette in the same territory as reasonably-ruled blackjack.
The rule applies only to even-money bets. Straight numbers and other inside bets remain at 2.70% on the same table. If you play red/black, a French table with la partage is worth actively seeking out; the tables are usually labelled, and the rule is stated in the info panel.
Why systems do not work, in one paragraph
Every spin is independent. The wheel retains no record of previous results, and the probability of red on the next spin is 48.65% regardless of whether the last ten spins were black.
That is the gambler’s fallacy, and it is the foundation of essentially every roulette system. Martingale doubles after each loss and fails when the required bet exceeds the table maximum or your bankroll — which happens precisely during the losing run it was designed to survive. D’Alembert, Fibonacci and Labouchère vary the shape of the progression without changing the underlying property: no sequence of bets can alter the expected value of a series of independent negative-expectation events. The house edge applies to each dollar staked, whenever it is staked.
What systems do reliably produce is a high proportion of small winning sessions and a small proportion of very large losing ones, averaging out to exactly the same 2.70%. The distribution feels like it works, which is why the belief persists.
Choosing a table sensibly
- Confirm the wheel type first. Single zero only. American and triple-zero wheels cost double or more for identical play.
- Look for French rules if you intend to play even-money bets. La partage or en prison halves your cost on those bets.
- Check the table minimum against your budget — roughly 1–2% of the session budget per spin.
- Understand what your bet selection is actually choosing. Inside bets mean rare, large payouts and high variance; outside bets mean frequent small ones. The cost per hour is identical.
- Note the pace. Live tables run 35–45 spins an hour; RNG roulette can exceed 100. At 2.70%, tripling the pace triples the hourly cost at the same stake.
- Ignore the results board. The display of previous numbers is presentational. It has no predictive content, and its main function is encouraging bets based on patterns that do not exist.
That last one deserves emphasis, because the history board is the single most effective piece of design on a roulette table. It exists to make independent events look sequential.
Where the actual decisions are
Stripping it back: in roulette there are exactly three decisions that affect your expected cost — the wheel you choose, whether French rules apply to your bet type, and how fast and how large you play. Bet selection within a given wheel affects only how the outcomes are distributed.
That is a shorter list than the table layout suggests, and it is worth knowing precisely because so much of the game’s presentation implies otherwise.
A closing note that belongs in any honest piece on this subject: even at the best available rules, roulette retains a permanent edge in the house’s favour, and no bet pattern, system or observation of past spins alters it. Set a budget you are entirely comfortable losing, decide your stop point in advance, and step away when you reach it. Gambling is for adults 18+ only, and free support services operate in every Australian state.