Quick answer
European roulette has one zero and 37 pockets; American roulette adds 00 for 38 pockets. The extra pocket increases the mathematical house edge on standard bets. Outside bets cover more numbers and win more often but pay less, while inside bets cover fewer numbers and pay more. Every spin is independent.
European, French and American roulette
European roulette uses numbers 1–36 plus a single zero. American roulette uses 1–36, zero and double zero. French roulette commonly uses the single-zero wheel and may add rules such as la partage or en prison on even-money bets when zero appears. Always open the table rules because a familiar layout does not guarantee the same zero rule or minimum bet.
On a standard single-zero wheel, the house edge is about 2.70% for most bets. On a double-zero wheel it is about 5.26%. This is a long-run mathematical measure, not a prediction for a short session.
Inside and outside bets
- Straight up: one number, normally paid 35 to 1.
- Split: two adjacent numbers, normally paid 17 to 1.
- Street: three numbers in one row, normally paid 11 to 1.
- Corner: four adjoining numbers, normally paid 8 to 1.
- Dozen or column: twelve numbers, normally paid 2 to 1.
- Red/black, odd/even, high/low: eighteen numbered pockets, normally paid 1 to 1; zero is outside these groups.
Higher payout does not mean higher expected value. The payout changes because the probability changes. Confirm the actual table paytable before staking.
Why betting systems do not remove the edge
Progressions such as Martingale, Fibonacci and Labouchere rearrange stake sizes after wins or losses. They do not change the pocket probabilities. A progression can create many small wins followed by one large loss, and table limits or a limited bankroll eventually stop unlimited doubling. Flat staking is easier to track and prevents one losing sequence from expanding exposure automatically.
A practical session plan
- Choose a single-zero wheel when available and check special zero rules.
- Set a money limit that is separate from bills and savings.
- Set a fixed time limit and a maximum number of spins.
- Use a small flat unit rather than raising the stake after a loss.
- Record the opening balance, stake size and stopping point.
- Stop when either the time or money limit is reached.
A win target can also be used as a stopping rule, but it does not make a win more likely. The purpose is to define when the session ends.
Common mistakes
The gambler’s fallacy assumes that a color or number becomes “due” after a run. Hot and cold boards describe previous spins only. Covering more numbers raises the chance of a hit but reduces the payout, and it still leaves zero outside many even-money groups. Side bets and multipliers can have separate rules, so do not assume the base-wheel mathematics applies unchanged.
Frequently asked questions
What is the best roulette bet?
There is no bet that overcomes the published edge. Single-zero rules and low-volatility outside bets can reduce cost or swings relative to some alternatives.
Can previous spins predict the next result?
No. A valid wheel or certified online game settles each spin independently.
Is live roulette different?
The video presentation differs, but the wheel, payouts, limits and zero rules still determine the bet.