Outside Bets in Online Roulette Explained

Outside bets cover 12 or 18 numbered outcomes on the roulette layout. The even-money groups are red or black, odd or even, and low (1–18) or high (19–36); each covers 18 of the 37 pockets on a European wheel and pays 1:1. That creates a win probability of 18/37, or 48.65%, because zero belongs to none of these groups. Dozens divide 1–36 into 1–12, 13–24, and 25–36, while columns follow the three vertical layout lines. Each 12-number selection pays 2:1 and wins on 12/37, or 32.43%, on a single-zero game.

Outside wagers reduce volatility, not the mathematical house advantage. A standard European single-zero table retains 2.70% of stakes in theoretical long-run expectation, equivalent to 97.30% RTP; an American 0/00 wheel has a 5.26% edge and 94.74% RTP. French rules such as la partage can reduce the edge on even-money selections to 1.35% when zero lands, but players must confirm that the specific table offers the rule. Previous spins never change the next spin’s probability, so Martingale-style staking cannot overcome the edge. In Ontario’s regulated online market, operators must provide accessible financial or time-based gaming limits, which can support a fixed roulette budget and session length.