At its core, online roulette is about the wheel. Two key differences decide the long-term odds: the number of pockets, and the rules used for even-money bets on the rare 0 or 00 outcomes. The 37-pocket European wheel has just one zero, while the 38-pocket American wheel adds a 00 pocket, shrinking the payout odds.
House Edge by Wheel
The extra pocket matters, and so do the rules used for even-money bets on black, red, odd or even when the ball lands on the 0 or 00. For the European single-zero wheel, the house edge over standard bets is 2.70%. An American double-zero wheel tacks on another zero to those 37 pockets, and that extra pocket payout tilts the odds to a house edge of 5.26%.
The third option is French single-zero roulette and its special rules for black, red, odd or even on 0. Here, the house edge on those bets drops to 1.35% thanks to the even-money rules called la partage or en prison. French gameplay otherwise uses the same 37-pocket single-zero layout and payouts as standard European roulette.
How La Partage and En Prison Change Odds
European and French roulette gameplay breaks on the same 37-number layout with a single zero. But when the ball lands on that 0 pocket, even-money bets follow different rules in French roulette. French tables offer either la partage or en prison to reduce the house edge on black, red, odd or even.
La partage halves the stake when 0 lands, with the player losing only 1/2 of an even-money wager. The house edge then comes to 1.35% on black, red, odd or even. En prison works the same, except the stake is returned without profit if it wins on the next spin. The odds and house edge are unchanged.
Other French bets, like column or dozens, pay according to the standard 37-pocket odds of 2.70%. But for even-money, French roulette offers a better deal than standard European: a single-zero wheel plus the chance to halve the stake or a re-spin of the wager. Only that even-money 1.35% edge is better, and that's with the rules to avoid the house winning on black, red, odd or even at 0.
Bets, Not Betting System Myths
Roulette odds depend on the payouts and rules, and which even-money rules apply. Standard bets on the same wheel share the same odds, even the special bets. The wheel variant, and not the individual bet type, is the key. Roulette gameplay is about the wheel and even-money rules, and not betting systems or chance.
