THE NUMBERS MATTER
Odds & calculators
Explore how payouts and probabilities relate to the house edge. Try the European roulette calculator below.
INTERACTIVE TOOL
Roulette expected value
Standard European single-zero roulette, with a straight-up or color bet.
Chance of winning48.65%
Expected loss per spin0.27
Expected loss across spins27.03
Results are mathematical averages, not predictions or limits on actual losses.
TEST YOUR UNDERSTANDING
Strategy quick check.
Four short questions on rules and probabilities. See what you remember before practicing.
QUESTION 1 OF 4