European vs American Roulette: Rules and Expected Value for Casino Players

Roulette remains a cornerstone of the casino floor because its rules are simple yet its mathematics are unforgiving. The key distinction is the wheel layout: European roulette has a single zero (0), while American roulette adds a double zero (00). That extra pocket changes the expected value (EV) for every bet, meaning two tables that look similar can produce materially different long-run outcomes for the same staking plan.

In both versions, most bets pay identical odds, but the house edge differs because of the number of pockets. European roulette has 37 numbers, so a straight-up bet pays 35:1 but has EV = (1/37)*35 – (36/37)*1 = -1/37, a house edge of about 2.70%. American roulette has 38 numbers, so EV = (1/38)*35 – (37/38)*1 = -2/38, a house edge of about 5.26%. Even-money bets (red/black, odd/even, high/low) follow the same logic: European EV is -1/37, American EV is -2/38. Some venues offer “la partage” or “en prison” on European even-money bets, which can roughly halve the edge when 0 appears. If you are comparing tables or guides, be wary of marketing that obscures this gap, whether on review pages such as lolajack casino or elsewhere.

For a useful industry lens, consider Richard Marcus, a well-known roulette advantage player and author who has spoken publicly about how tiny rule differences compound over time; his commentary is easiest to follow via Richard Marcus on X. Broader context also matters: regulation and online growth shape which wheel variants are promoted and how they are presented to players, as discussed in mainstream coverage like The New York Times. The practical takeaway is straightforward: when the goal is better EV, European rules—especially with player-friendly zero rules—are the mathematically superior choice.