Bankroll & risk-of-ruin simulator
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Risk of ruin is the probability of losing your entire bankroll over a series of bets. It rises with bet size relative to balance and with the house edge. Any game with a house edge above zero tends toward zero balance over the long run — the only question is how fast. This Monte Carlo simulator runs thousands of scenarios on your inputs and shows the probability of ruin, the median outcome and sample trajectories. 18+.
An exact simulation: you set every parameter, the tool runs thousands of sessions and shows the real risk. No "winning secrets" — only the math of the house edge.
How to read the result
The house edge is derived from win chance and payout: at 49.5% chance and 2× payout it equals 1%. The higher the edge and the larger your bet relative to bankroll, the higher the probability of ruin. Note: even with seemingly "favourable" inputs, long play almost always leads to loss — raising the number of rounds raises the risk of ruin. That is not a simulator bug but the essence of gambling math. You can lower the risk only with a smaller bet and fewer rounds, but you cannot remove it while the house edge is positive. Learn more: house edge, bankroll management, why not to chase losses.
Risk of ruin FAQ
What is risk of ruin?
Can the risk be reduced to zero?
Why is playing longer worse?
Does this predict my results?
What inputs are realistic?
Related resources
18+ · A statistical model, not a prediction. Casino games carry a house edge — winning long-term is impossible. Play responsibly within a budget.