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Risk of Ruin Calculator

Calculate the exact probability of losing your entire bankroll before reaching a profit target. See the mathematical reality behind the Martingale system and other betting strategies — understand the math before you decide.

Last updated: March 28, 2026

Understanding Risk of Ruin

Risk of Ruin is the probability that you will lose your entire bankroll before reaching your profit target. For negative EV games like roulette, playing indefinitely guarantees ruin — the only question is how long it takes.

Configuration

Configure your parameters and click Calculate to see results.

Important:No betting system can overcome the house edge over the long run. Risk of Ruin is a mathematical certainty for any negative-EV game with infinite play. The Martingale, Fibonacci, Labouchere, and D'Alembert systems all suffer from the same fundamental flaw: they cannot change the expected value of the game.

Spins are independent. Past results have no bearing on future outcomes. This is a free mathematical simulation for educational purposes. No real money is used.