Roulette streak calculator
Find the probability of a losing streak in one specified sequence or anywhere within a longer roulette session.
Every spin in one chosen block must lose.
The run can start at any position in the session. Overlapping runs count once in this probability.
- Chance a red bet loses on the next spin
- 51.3514%
Model assumptions
A loss means a red bet loses: black and zero pockets both count. The session calculation uses a state model that counts overlapping runs correctly. A run longer than the session has probability zero. These are unconditional probabilities for future independent spins; a completed streak gives no signal about the next pocket.
Read the method
Use our simulation methodology for model boundaries, house-edge calculations for expectation, and bet payouts for settlement rules.
Sources and scope
- Rules of Play for Table Games, Roulette. British Columbia Lottery Corporation. Double-zero standard payout table and placement. European pocket count is independently verified from native Wheel.
Publication date: not stated. Checked 2026-11-07.
- Roulette probability derivation. Amenti Labs LLC. Fair independent pockets, fixed payouts, full outside loss on zero. Formula and all supported bets regression tested.
Publication date: 2026-11-07. Checked 2026-11-07.
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