On a standard roulette table, a red bet wins when the ball lands in one of 18 red pockets. The zero pocket is neither red nor black. Change the stake and wheel below to see why an extra 00 pocket matters.
One extra pocket changes the maths
This models an ordinary red/black bet with an even-money payout and no special zero rule. It shows long-run maths, not what the next spin will do.
How to read the result
At €5 a spin, an ordinary even-money red win returns €10 in total: your €5 stake and €5 profit. On a single-zero wheel the chance of red is 18/37, about 48.65%. On a double-zero wheel it is 18/38, about 47.37%. The usual house edges for these bets are about 2.70% and 5.26% respectively. An average loss is a long-run arithmetic figure, not a prediction for your session.
What this does not cover
Some tables use special rules such as la partage, different payouts or multiplier features. Check the exact table rules and minimum stake. A run of red or black does not make the next independent spin “due”. See our beginner roulette guide for the betting layout.
How checked: The pocket counts and ordinary bets are described in the Nevada regulator’s roulette rules; the percentages here are calculated directly from those counts. Checked 12 November 2026. This is a standard-rule example, not a claim about every table or jurisdiction.
For adults only, where legal. No roulette bet is a source of reliable income. See House Edge Explained and Safer Gambling.