Risk of Ruin Simulator is a free online tool that runs thousands of Monte Carlo betting paths to estimate how likely your bankroll is to go bust. Set your bankroll, bet size, win probability and payout odds — it simulates the grind and reports the one number that matters: your chance of ruin.
Your wager
Results
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Risk of ruin
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Median final bankroll
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EV per bet (theory)
Equity paths
Set your numbers above and press Run simulation — up to 300 sampled paths will appear here.
survivedruinedmedian path
Ruin means the bankroll hits zero (fixed bets) — or falls below 1% of the starting bankroll (proportional bets, which can never reach exactly zero). A positive expected value does not imply a low risk of ruin.
Bet sizing is the dominant lever: the same edge can be nearly un-bustable at 1% stakes and a coin flip away from blowup at 10%.
The Kelly hint is the closed-form Kelly fraction for your win probability and odds. Staking well above it usually means most of your edge is being converted into volatility.
Educational tool. Simulated paths are illustrative, not financial advice.