Game guides
Online Roulette Guide — European, American & Live Roulette Compared
Roulette is the simplest mainstream casino game and one of the worst-understood. The difference between European roulette (1 zero, 2.70% house edge) and American roulette (1 zero + 1 double-zero, 5.26% house edge) doubles the cost of every bet you place — yet many online casinos run both side-by-side without making the distinction obvious. French roulette with the La Partage rule cuts the even-money edge to 1.35%. The wheel layout, betting menu, and table feel are nearly identical across all three. The math is not.
This guide walks you through the three main variants, the math behind inside and outside bets, the popular “systems” (Martingale, Fibonacci, D’Alembert) and why none of them change the long-run expected loss, and the practical differences between live dealer and RNG roulette.
How roulette works
A spinning wheel has 37 or 38 numbered pockets. A ball is dropped onto the wheel and lands in one pocket. You bet on which number or group of numbers the ball will land in. Payouts scale with the unlikelihood of the bet — a single-number bet pays 35-to-1 if it hits, a red/black bet pays 1-to-1.
The number layout on the wheel alternates red and black for most numbers, with the 0 (and 00 on American wheels) coloured green. The wheel and the betting table are designed to look like a closed system, but the casino’s edge comes from one source: the green zeros pay 35-to-1 on a straight bet, the same as any number, but there are more numbers on the wheel than the payout assumes. That gap is the house edge.
The three variants and what they cost you
| Variant | Pockets | House edge (most bets) | House edge (even-money bets with rule) |
|---|---|---|---|
| European roulette | 37 (0-36, one zero) | 2.70% | 2.70% |
| American roulette | 38 (0-36 + 00) | 5.26% | 5.26% |
| French roulette (La Partage) | 37 (0-36, one zero) | 2.70% | 1.35% |
| French roulette (En Prison) | 37 (0-36, one zero) | 2.70% | 1.35% |
The math, with an explicit example. If you bet £10 on red:
- European roulette: 18 red / 18 black / 1 zero. Probability of winning is 18/37 = 48.65%. Expected return: £10 × (18/37) × 2 = £9.73. Expected loss: 27p per £10 bet.
- American roulette: 18 red / 18 black / 0 / 00. Probability of winning is 18/38 = 47.37%. Expected return: £10 × (18/38) × 2 = £9.47. Expected loss: 53p per £10 bet.
- French roulette with La Partage: same as European, but if the ball lands on zero on an even-money bet, you get half your stake back. Expected loss: 13.5p per £10 bet.
Across 100 bets of £10 at red, American roulette costs you roughly £53 in expected loss. European costs you £27. French (La Partage) costs you £13.50. Same time spent, same stake, same game feel — and the long-run cost varies by 4× depending on which variant you sat down at.
Always pick European over American if both are available. Pick French if available — La Partage and En Prison are the two best rules in regular casino play.
La Partage and En Prison explained
These are the two French rules that cut the even-money house edge:
La Partage (“the split”). If you bet on red, black, even, odd, 1-18, or 19-36 and the ball lands on zero, you get half your stake back immediately. The house wins the other half. This effectively halves the house edge on those bets from 2.70% to 1.35%.
En Prison (“imprisoned”). On a zero, your even-money bet is “imprisoned” — it stays on the table for one more spin. If your bet wins on the next spin, you get your stake back (no winnings). If it loses, you lose the stake. Same long-run math as La Partage.
Both rules apply only to even-money outside bets. Straight, split, street, corner, line, dozen, and column bets are unaffected — they still carry the standard 2.70% European edge.
If you are going to play roulette regularly, French roulette tables with one of these rules are the only sensible choice. They are widely available on Evolution and Pragmatic Play Live feeds.
Inside vs outside bets
The betting layout splits into two zones.
Inside bets — high payout, low probability
| Bet | Numbers covered | Payout | Probability (European) |
|---|---|---|---|
| Straight (single number) | 1 | 35-to-1 | 2.70% |
| Split (two adjacent numbers) | 2 | 17-to-1 | 5.41% |
| Street (three numbers in a row) | 3 | 11-to-1 | 8.11% |
| Corner (four numbers at a corner) | 4 | 8-to-1 | 10.81% |
| Six-line (two adjacent rows) | 6 | 5-to-1 | 16.22% |
Outside bets — low payout, high probability
| Bet | Numbers covered | Payout | Probability (European) |
|---|---|---|---|
| Red / Black | 18 | 1-to-1 | 48.65% |
| Even / Odd | 18 | 1-to-1 | 48.65% |
| 1-18 / 19-36 | 18 | 1-to-1 | 48.65% |
| Dozen (1-12 / 13-24 / 25-36) | 12 | 2-to-1 | 32.43% |
| Column (12 vertical) | 12 | 2-to-1 | 32.43% |
All bets have the same 2.70% house edge on European roulette (or 5.26% on American, or 1.35% on French even-money). The payout-to-probability ratio is calibrated to give the casino the same edge on every bet. There is no “best bet” by house edge. The choice is between variance profiles.
- Straight bets on single numbers: 35-to-1 payout, hits once every 37 spins on average. Long dry stretches, occasional big wins. Like a slot.
- Red/Black: 1-to-1 payout, hits just under half the time. Smooth bankroll. Like a low-variance slot.
Pick the variance profile that matches your bankroll. £20 on red/black at £1 per spin can give you 50+ spins of play. £20 on a single number at £1 per spin will probably be over in 20 spins.
Why betting systems do not work
Roulette betting systems are popular because they appear to “guarantee” profit. They do not. Here is the math for the three most common, applied to even-money bets on European roulette (2.70% edge).
Martingale
You bet £10 on red. If you lose, you bet £20 on the next spin (doubling). If you lose again, £40. Then £80. Then £160. The first time you win, you recover all losses plus £10 profit.
This works until one of two things happens:
- You hit the table maximum. Most online roulette tables have a maximum of around £500-£2,000 on even-money bets. Starting from £10 and doubling, you reach £640 after 6 consecutive losses. The probability of 6 consecutive losses on red (even-money on European roulette) is approximately 1 in 79. In a session of 200 spins, the chance of hitting that streak at least once is roughly 78%. Once you hit the table cap, you cannot double again and the system collapses.
- You run out of bankroll. Doubling 8 times from £10 needs a £2,550 bankroll for a single sequence. Most players do not have that.
The long-run expected loss with Martingale is exactly the same as flat betting — the house edge is 2.70% of every pound wagered, regardless of bet-sizing scheme. The system trades many small wins for the occasional catastrophic loss. The mean is unchanged; the variance gets worse.
Fibonacci
You bet according to the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21, 34, …) — increasing on loss, stepping back two positions on win. Slower escalation than Martingale, same fundamental problem: a long losing streak eventually breaches your bankroll or the table cap. House edge: unchanged.
D’Alembert
Increase your bet by 1 unit after a loss, decrease by 1 unit after a win. Smoother than Martingale. Same fundamental problem: a streak biased to losses produces a creeping bankroll drawdown that has no recovery mechanism. House edge: unchanged.
“No betting system can convert a negative-expectation game into a profitable game.” — that is the American Mathematical Society’s summary and it applies universally to roulette systems.
Systems can change when you lose (more frequent small wins offset by rare large losses, or vice versa). They cannot change the average rate of loss. If you enjoy the structure of a system as a bankroll-discipline tool, that is fine — but understand that the math is not on your side.
Live dealer vs RNG roulette
RNG roulette is software. The spin outcome is generated by a certified random number generator. Speed is high — you can complete 60+ spins per hour solo. The graphics are stylised but the math is identical to a physical wheel. RTP figures match the variant chart above.
Live dealer roulette is a physical wheel filmed by camera. Speed is much slower — 35-45 spins per hour in a multi-player game, or up to 60 in an automatic / “speed” variant. The lower speed reduces how fast your bankroll moves; same house edge, less exposure per hour.
The two dominant providers are Evolution (multiple branded tables — Lightning Roulette, Immersive Roulette, Speed Roulette) and Pragmatic Play Live. Their European and French tables are widely available on UKGC and MGA-licensed casinos. Lightning Roulette is a popular Evolution variant that adds “lucky number” multipliers to straight bets — the payouts are higher but the base RTP is 97.30% (down from 97.30% standard European, with the multiplier maths factored in differently across bet types) — check the in-game info panel before playing.
How to play roulette with a budget
A practical session structure:
- Pick the variant first. French (La Partage) > European > American. Refuse American if anything else is available.
- Set a session loss cap. £20 / £50 / £100 — whatever you can absorb without affecting next month. Write it down. Treat it as a hard line.
- Pick a stake size that gives you enough spins. Rule of thumb: bankroll ÷ 30 = max stake. £60 budget → £2 per spin. That gives you 30 spins minimum on a single bet, 50+ if you mix outside bets and small inside bets.
- Pre-decide your exit point. “I leave when I am up £20 or down £40.” Roulette has no internal stopping signal — you have to bring your own.
- Avoid systems — they extend your session statistically by replacing many small losses with occasional large ones, and the long-run cost is identical.
- Use deposit limits. Every UKGC and MGA casino requires deposit limits to be available; set them at the casino level so a moment of “one more spin” cannot exceed your monthly budget.
Frequently asked questions
Which roulette variant has the best RTP?
French roulette with La Partage or En Prison rules — 98.65% RTP on even-money bets, 97.30% on all other bets. European roulette is 97.30% across the board. American roulette is 94.74%. Always check the variant before sitting down.
Are online roulette spins really random?
On RNG tables, yes — outcomes come from a certified RNG (tested by eCOGRA or GLI). On live tables, the physical wheel is the source of randomness. Both are audited regularly. There is no “due” number — the wheel has no memory.
Can I beat roulette with a system?
No. Every published roulette betting system has been mathematically proven to not change the house edge. Systems change the variance profile (when you win or lose) but not the expected average loss rate. Anyone claiming otherwise is selling a system, not a result.
What is the difference between roulette and Lightning Roulette / similar variants?
Branded variants like Lightning Roulette, XXXtreme Lightning, or Immersive Roulette layer extra mechanics (multipliers, side bets) on top of standard European roulette. The base wheel is unchanged. The added mechanics usually have higher house edges than the base game — the in-game RTP figure is the one that matters, and these are typically 96.5-97%, below standard European at 97.30%.
Is American roulette worth playing for any reason?
No. The double zero adds 2.56 percentage points to the house edge with zero compensating benefit. American roulette is on most international casinos for compatibility, not for player value. If both are offered, pick European or French every time.
How long can I play roulette on a £100 bankroll?
At £2 stake per spin on outside bets, a £100 bankroll has an expected duration of around 2-3 hours of play before depletion, with a wide variance band. Adding a session loss cap of £80 and a stop-win of +£50 typically keeps recreational sessions in the 60-90 minute range.
A note on responsible play
Roulette has the simplest interface in the casino — one click per spin — and that simplicity is part of why people lose track of bankroll. 60 minutes of solo RNG play at £2 per spin is roughly £120 staked. Even at the best house edge (1.35% French), expected loss is £1.62 per hour plus variance. At American 5.26%, the same hour costs £6.30 of expected loss.
If you are tracking your spending and find yourself running over the limits you set, BeGambleAware and the GamCare helpline (0808 8020 133) are both free, confidential, and 24/7.
Affiliate disclosure
GambleDragon earns commission when readers sign up to operators via our links. We only review casinos that offer European or French roulette as default; American-only roulette is downgraded in our methodology. The math above is checked against Wizard of Odds and provider datasheets before publication.