Probability Breakdown
European roulette has 37 pockets (0–36). Each number has a 1/37 (2.703%) probability. Red/Black: 18/37 = 48.65%. Dozens/Columns: 12/37 = 32.43%. The zero (green) is what gives the house its edge — it's neither red nor black, odd nor even.
House Edge Explained
Roulette has a 2.7% house edge (97.3% RTP). Every bet type has the same edge. Straight-up pays 35:1 but fair odds would be 36:1. Red/Black pays 1:1 but probability is 48.65%, not 50%. The single zero pocket creates this universal 1/37 advantage for the house.
What Does This Mean for You?
With an RTP of 97.3%, for every 100 coins you wager on Roulette, you can expect to get back approximately 97.3 coins over thousands of rounds. The remaining 2.7% goes to the house.
This is a long-run average. In any single session, your results will vary wildly — that's the variance (volatility: Medium). Short sessions can see 50%+ swings in either direction. The RTP only converges over thousands of rounds.
Rookie's provably fair system means you can verify these odds yourself. Every round is cryptographically determined before you play, and the math is public. No hidden RNG, no server-side manipulation.