Roulette simulator

A European single-zero wheel with eight bet types. Every one of them has a house edge of exactly 2.70%, and this is the fastest way to see why: the payouts are calculated as if the zero were not there.

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Last number

Return to player, observed

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Numbers covered—
Win chance—
Spins0
Won / lost0 / 0
Zero came up0
Net—
Theoretical RTP97.30%

Switch between a straight-up number and red/black. The theoretical RTP stays at 97.30% for both — only the size of the swings changes.

Latest results

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The zero is the entire business

A European wheel has 37 pockets: 1 to 36 plus a single zero. Red covers 18 of them, so you win 18 times in 37 — 48.65%, not 50%. The payout is 1:1, priced as though you won half the time.

That gap is the house edge: 1 − (18/37 × 2) = 2.70%. Run the same arithmetic on a straight-up number — 1 in 37 paying 35:1 — and you get 1 − (1/37 × 36) = 2.70%. Identical. Every bet on a European wheel is priced off a 36-pocket wheel that does not exist.

An American wheel adds a second zero, 38 pockets, and the same payouts. That takes the edge to 5.26% — nearly double, for one extra pocket. If a casino offers you both, the choice is not close.

Roulette also illustrates why rakeback matters less than game selection. At 2.70% edge with 5% rakeback you recover 0.135% of turnover. Moving to a 1% crypto original saves you 1.7% — more than twelve times as much.

How to use the roulette simulator

  1. The wheel spins on its own. Pick one of eight bet types.
  2. Watch the zero come up — that single pocket is the whole 2.70% edge.
  3. Switch between red and a straight-up number: the RTP stays the same, the swings do not.
Roulette Simulator on cryptocodes.ai — screenshot
Roulette Simulator, running in the browser.

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