American vs European Roulette: The House Edge Explained

If you can read a roulette table layout, you can see the difference between the American and European versions in under a second: the American wheel has two zero pockets (0 and 00) while the European wheel has only one (0). That small visual difference hides a big mathematical one — it doubles the house edge. Every other variant and rule on the market is a footnote to that core contrast. Here’s what the maths actually looks like, where each version came from, and why French roulette is even better than European.

The Maths in One Table

Variant	Pockets	Zeros	House Edge	Expected loss per €100 wagered
European roulette	37	1 (0)	2.70%	€2.70
American roulette	38	2 (0 and 00)	5.26%	€5.26
French roulette (La Partage)	37	1 (0)	1.35% on even-money	€1.35 on red/black, odd/even, high/low
French roulette (En Prison)	37	1 (0)	1.35% on even-money	Same 1.35% — alternative rule

The single-zero layout gives European roulette nearly half the house edge of American roulette. Over a long session, that’s the difference between losing €54 and losing €105 on €2,000 of total wagers. French roulette (really a European wheel with an extra rule on zero) cuts the edge further on even-money bets.

How the Double Zero Became a Thing

The roulette wheel was formalised in 18th-century France, originally with both a zero and a double-zero pocket. Both pockets paid the house on every bet that wasn’t directly on them — meaning the house kept the money when the ball landed there, regardless of whether you were betting red, black, odd, even, or anything else. Over time, competition drove operators to experiment.

The breakthrough came in 1843, in Bad Homburg, Germany. François and Louis Blanc opened a casino with a single-zero wheel — a direct response to Monaco’s stricter licensing. The single-zero wheel was wildly more attractive to players because the house edge was halved. Bad Homburg quickly pulled traffic away from the double-zero casinos in France and across Europe, and within decades the single-zero layout became the continental standard.

The double-zero survived in the United States, which imported roulette via Mississippi riverboats in the 19th century. Steamboat operators re-added the 00 pocket to increase their margins. When land-based casinos opened later in Nevada, the double-zero American layout was already the norm and has stayed so in Las Vegas and Atlantic City floors to this day.

For the full arc from Pascal’s perpetual-motion wheel to the modern table, see our history of roulette.

How the Extra Pocket Changes Everything

Roulette payouts are calibrated as if the wheel had 36 equally-weighted pockets — so a straight-up bet pays 35:1. But the actual wheel has 37 (European) or 38 (American) pockets. That gap between the true odds and the payout is the house edge:

• European (37 pockets): true odds of hitting a number are 1 in 37, but the payout assumes 1 in 36. Edge: (1/37) × 36 − (36/37) × 1 = −2.70%.
• American (38 pockets): true odds are 1 in 38, payout still 35:1. Edge: −5.26%.

The extra pocket doesn’t “add a number” in a useful way — it adds a way for the house to win that the payout doesn’t compensate for. That’s why the edge roughly doubles.

French Roulette: A Rule Makes It Even Better

French roulette is a European wheel (single zero) with one of two extra rules that apply when the ball lands on zero:

• La Partage (“the sharing”) — half your even-money bet is returned.
• En Prison — your even-money bet is held in place for the next spin; you win it back if the next spin goes your way, lose it if not.

Both rules apply only to even-money bets (red/black, odd/even, high/low — 1–18 vs 19–36). They halve the effective house edge on those bets to 1.35% — the best single-deck-blackjack-tier number in any standard casino game.

If you’re an even-money roulette player and your chosen casino offers French roulette, always choose the French table. If you’re betting on specific numbers or combinations, La Partage doesn’t apply and you get no advantage over standard European roulette.

Which One Should You Play?

The practical answer is simple:

1. If French roulette with La Partage/En Prison is available: play it for even-money bets. 1.35% edge.
2. Otherwise: play European roulette. 2.70% edge, universally available.
3. Avoid American roulette unless you specifically want the American layout for nostalgic or cultural reasons — it’s strictly worse for the player on every bet type.

This holds regardless of whether you’re playing RNG tables or live dealer. Live dealer European roulette has the same 2.70% edge; live dealer American has the same 5.26%. The wheel’s physics is the only difference.

What About Lightning, Quantum, Immersive and Other Branded Variants?

Live-dealer studios have built branded roulette products (Evolution’s Lightning Roulette, Playtech’s Quantum Roulette, etc.) on top of single-zero European wheels. The underlying edge is still 2.70% — the “bonus” mechanics pay out multipliers on random straight-up numbers in exchange for a slightly higher per-spin cost. The maths is still essentially European-roulette, with modest variance-modifiers layered on top.

These are fine if you enjoy the production values. They’re not a cheat code that beats the standard edge.

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