How to play roulette
A wheel with numbered pockets spins in one direction while a small ball spins in the other around its rim. Bets are placed on a betting layout before the dealer calls “no more bets”, the wheel slows, and the ball drops into one of the pockets. Whatever number and colour it lands on decides every bet on the table for that spin.
You are not playing against other players at the table, and you are not playing against the dealer either, in the sense that blackjack players are; the dealer simply spins the wheel and pays out according to a fixed schedule. There is no decision to make once the bets are down, no hand to read, and nothing to bluff. That simplicity is exactly why roulette rewards understanding the bets rather than the play.
European wheels carry 37 pockets, numbered 0 to 36, alternating red and black with the zero in green. American wheels add a second green pocket, 00, for 38 pockets total. That single extra pocket is the whole story of why American roulette costs almost twice as much to play, spin for spin, as European.
A round takes as long as it takes players to place their chips, which online moves considerably faster than a crowded physical table. RNG versions typically run one spin every few seconds if you let them; live-dealer tables run on the dealer’s pace, usually one spin every 40 to 60 seconds once betting time is included.
European and French tables often add a second betting area called the racetrack, an oval diagram of the wheel used for “call bets”: Voisins du Zéro, Tiers du Cylindre and Orphelins, French names for groups of numbers that sit next to each other on the physical wheel rather than in the numerical order printed on the main layout. They cost the same house edge as any other combination of straight-up bets; the racetrack is a faster way to place several numbers at once, not a better one.
The layout and every bet on the table
Roulette’s betting layout looks intimidating because there are so many ways to bet on the same 37 or 38 numbers, but every bet falls into one of two families: inside bets, placed directly on numbers, and outside bets, placed on the groupings around the edge of the layout.
| Bet | Description | Payout | House edge (European) |
|---|---|---|---|
| Straight up | Single number | 35:1 | 2.70% |
| Split | Two adjacent numbers | 17:1 | 2.70% |
| Street | Three numbers in a row | 11:1 | 2.70% |
| Corner | Four numbers in a square | 8:1 | 2.70% |
| Six line | Two adjacent streets (six numbers) | 5:1 | 2.70% |
| Dozen (1-12, 13-24, 25-36) | Twelve numbers | 2:1 | 2.70% |
| Column (top/middle/bottom) | Twelve numbers | 2:1 | 2.70% |
| Red/Black | Eighteen numbers | 1:1 | 2.70% |
| Odd/Even | Eighteen numbers | 1:1 | 2.70% |
| High/Low (1-18/19-36) | Eighteen numbers | 1:1 | 2.70% |
On a European wheel the house edge is the same 2.70% on every single one of those bets, straight up or spread across eighteen numbers, because the payout odds are set against 37 pockets regardless of how many numbers a bet covers. The one exception on most tables is a five-number bet unique to the American wheel (0, 00, 1, 2, 3), which pays 6:1 against worse-than-average odds and carries a house edge over 7.8%, the single worst bet on the felt and one European wheels do not even offer.
Best bets for roulette
Because every standard bet on a fair wheel carries the same house edge, “strategy” in roulette is less about finding a hidden edge and more about matching a bet’s risk profile to how you actually want to play. The chart above sets out where each bet sits on that spectrum: single numbers pay huge and hit rarely, outside bets pay small and hit often, and everything in between trades one for the other in a mathematically fixed ratio.
The one decision that genuinely changes your expected cost, rather than just your variance, is which wheel and which rule set you sit down at. A European single-zero wheel at 2.70% costs roughly half of an American double-zero wheel at 5.26% for identical betting patterns. A French wheel with la partage active drops the even-money bets specifically down to about 1.35%, half again. None of that requires a system; it requires reading the table before you sit down.
Betting systems that adjust stake size after wins or losses, such as Martingale, Fibonacci or D’Alembert, change how losses and wins are distributed across a session without changing the average outcome of any individual spin. They can make a session feel more controlled, and they can also turn an ordinary losing streak into one enormous loss when the progression outruns your bankroll or the table’s maximum bet. None of them are strategy in the sense the blackjack or video poker charts on this site are; they are staking patterns applied to a game with no memory.
The mistakes that cost the most
Playing an American wheel because it is the only one open, without checking whether a European table exists elsewhere in the lobby or on the floor, is the most expensive habit in roulette and the easiest to fix. The extra 00 pocket nearly doubles the house edge for identical bets, and it costs nothing to check the wheel layout before placing a single chip.
Chasing losses with a progression system, most commonly Martingale, is the second. It works until it doesn’t, and the one time it doesn’t tends to erase every prior win with room to spare. The house edge does not care how much you bet on any given spin; it applies to every euro wagered, in a big bet or a small one.
Believing a number is “due” after a run of misses, or that a colour is “hot” after several hits in a row, is the third, and it is the gambler’s fallacy, one of the best-documented cognitive biases in all of gambling research. The wheel has no memory between spins, so past results carry zero information about the next one, however compelling the pattern looks written down.
Ignoring the five-number American bet’s especially poor odds, or its equivalents on other layouts, is the fourth. At over 7.8%, it is worse than every other bet on the table by a wide margin, and it survives mainly because new players do not know to avoid it specifically.
Paying for a “wheel prediction” app or system that promises to read ball speed and deceleration to call the winning number is the fifth. Wheel bias has happened. The English engineer Joseph Jagger famously exploited a mechanically imperfect wheel at Monte Carlo in 1873 by clocking which numbers came up most often, but that took weeks of manual observation on one specific physical wheel with a genuine manufacturing flaw, decades before modern wheel maintenance and RNG certification existed. It has no bearing on a certified RNG table or a modern, regularly serviced physical wheel, and no app can do from a phone camera what took Jagger a small team and a notebook.
Variants and rule differences to watch for
European roulette, with a single zero and a 2.70% baseline edge, is the standard to look for on any site or floor that offers a choice. It is the version referenced throughout this page unless stated otherwise.
American roulette adds the second zero and should be avoided whenever a European table is available at the same stakes. The rules and gameplay are otherwise identical, so there is no upside to the American version beyond table availability.
French roulette usually runs on a European wheel but adds la partage or en prison on the even-money bets, cutting their edge to about 1.35%. Some online versions apply la partage automatically and silently; check the game rules screen, since the discount does not show up anywhere on the betting layout itself.
Mini roulette, with only 13 numbers (0 to 12) and adjusted payouts, appears on some online catalogues as a faster, lower-stakes variant. Its house edge, typically in the 7–8% range depending on the paytable, is considerably worse than standard roulette, so treat it as a novelty rather than a substitute.
Playing roulette online in Ireland
Online roulette comes as RNG tables, where a certified random number generator decides the result of each spin, and live-dealer tables, streamed from a studio with a real wheel and dealer. Both are genuinely random processes and carry the same odds for the same wheel type; the difference is pace and atmosphere rather than fairness.
Stakes vary by operator, typically from around €0.10 or €0.20 a spin on RNG tables up to table maximums in the hundreds or low thousands, with live tables usually starting a little higher. LeoVegas and 888casino both run sizeable live-roulette selections among the partner casinos on this site, Betway and JackpotCity carry a broad RNG range with a smaller live selection, and Slotbox and Mr Green are both reviewed on this site without a partner link. Look for the wheel type in the game name or thumbnail: “European Roulette” or “French Roulette” rather than plain “Roulette”, which is sometimes the American double-zero version by default.
The Gambling Regulation Act 2024 sets a €10 maximum stake and €3,000 maximum win on certain casino-style games once an operator holds an Irish gambling licence; online casino licensing is expected from 2027, so current table limits on MGA- and UKGC-licensed sites are set by the operator rather than by Irish law.
What an hour of roulette actually costs
At a 2.70% house edge on a European wheel, a €5 bet spun roughly 40 times an hour on a live table costs, on average, about €5.40 an hour (2.70% × €5 × 40). The same €5 bet on an RNG table running 100 spins an hour costs closer to €13.50 an hour on average, purely because more spins happen in the same time.
Switch to an American wheel at 5.26% and both figures roughly double for identical bets: about €10.50 an hour live, and about €26.30 an hour on RNG at the same pace. Switch instead to a French wheel’s even-money bets under la partage, at about 1.35%, and the live-table figure drops to roughly €2.70 an hour. The wheel and the rule set decide more of this number than the bet you choose within them. Run your own stake and pace through the house edge calculator before setting a session budget.
Variance in roulette is real and sometimes dramatic: a single-number bet can go dozens of spins without hitting, or hit twice in a handful of spins, so none of these averages predict any one evening. They do predict where the money goes over a long enough run, which is the only thing a house edge was ever built to tell you.
The practical bankroll question is usually not “which bet” but “how many spins can this stake survive”. A €200 bankroll at €5 a spin on European even-money bets gives 40 spins of theoretical staying power before the average expected loss alone would exhaust it, though real sessions swing well above and below that line long before the maths catches up. Halving the stake to €2.50 a spin doubles that staying power for exactly the same odds, which is usually a better lever to pull than any staking system.