The American roulette wheel is a nineteenth-century accident that never went away. Early wheels in Europe had two zeros; a pair of French brothers removed one in the 1840s to undercut rival casinos, and the single-zero wheel took over the continent. The two-zero version crossed the Atlantic, stayed, and acquired the name of the country that kept it. Players today inherit the consequences.
Counting pockets
A single-zero wheel has thirty-seven numbered pockets; a double-zero wheel has thirty-eight. Payouts on both are identical: thirty-five to one on a single number, seventeen to one on a split, two to one on a dozen, even money on red or black. On a thirty-seven-pocket wheel the house holds back one pocket's worth of fair payout, which works out at 2.70 per cent of every stake. On a thirty-eight-pocket wheel it holds back two, which is 5.26 per cent. The extra zero does not change how the game looks or feels; it simply doubles what the game costs.
A season of Sundays
Imagine a player who spends twenty Sunday evenings a year at the wheel, two hundred spins each at £2. That is £8,000 wagered over the year. On a single-zero wheel the expected cost is about £216. On a double-zero wheel it is about £421. The difference, roughly £205, buys nothing: no extra entertainment, no different prizes, just a second green slot.
The French refinement
French tables, which are single-zero wheels with a particular layout, often add a rule for even-money bets. When zero lands, either half the stake is returned or the stake stays in place for the next spin. Either way the edge on those bets drops to around 1.35 per cent. For a player who favours red-black or odd-even, a French table is the cheapest form of roulette available.
Spotting the layout online
Game lobbies rarely label a game "American" prominently, and themed variants can hide the layout behind a name. Look at the wheel graphic or the betting layout: a green pocket marked with two zeros is the sign. Ninewin Casino shows the variant and house edge in the information panel of each roulette game, so the check takes a moment.
Roulette is for adults only. Choosing between the wheels is the one decision that the game leaves entirely in the player's hands, and it is worth making on purpose.