Why a winning number pays 35 to 1
A straight-up roulette bet puts the chip on one pocket. On an American wheel, that means choosing among 38 pockets: numbers 1 through 36, plus 0 and 00. A winning bet returns 35 chips for every chip wagered, with the original stake also returned. So a $1 bet wins $35 in profit and gets the $1 stake back.
The payout is slightly short of the odds
If all 38 pockets were equally likely, a fair payout would be 37 to 1. That would compensate for the 37 losing outcomes for every one winning outcome over the long run. Instead, the casino pays 35 to 1. The two green pockets, 0 and 00, help create the gap: they can make a number bet lose, but they do not add to its payout.
For each $1 wagered, the average return is $36 divided by 38, or about 95 cents. The remaining roughly 5 cents per dollar is the house edge—the casino’s built-in advantage across many bets, not a guarantee that it will win any particular spin.
Why the payout still feels compelling
A single number bet trades frequent losses for a large-looking win. Most spins miss the chosen pocket, but the possibility of a 35-to-1 payout makes the bet easy to understand and exciting to watch. The arithmetic is simple; the edge is hidden in the difference between the true odds and the advertised payout.
