Roulette, one assumption at a time

Look past the last spin.

Roulette layouts, probability and the mathematics of independent outcomes. No systems that promise to beat the wheel.

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Compare roulette wheel assumptions

Fair wheel layout

Assumes a single-number bet with 35:1 net payout. Other bets, rule variations and special rules need separate calculations.

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Roulette literacy

Consider an ideal single-zero roulette wheel with 37 equally likely pockets: numbers 1 through 36 and one zero.

Roulette literacy

A run of red results is a description of completed spins.