Risk of Ruin & Bankroll Simulator
18+ only. Contains affiliate links — we may earn a commission. Not for residents of the US, UK, France, Germany, Netherlands, Spain, Austria, Australia, Ontario or Vietnam. Not legal or financial advice.
Simulates thousands of betting sessions to show how often a bankroll goes to zero and how results spread out. Educational only: with a house edge every game has a negative expected value.
⚠ Example inputs: a 49.5% win chance paying 2× is a dice bet with a 1% house edge. Replace with your own.
Result
18+ only. Educational simulation, not a prediction or advice. With a house edge the expected value is always negative: no betting system changes that.
Pre-filled inputs are examples (a 49.5% / 2× bet has a 1% house edge). The simulation uses your browser's random numbers, not any casino's game.
How it is calculated
- Expected value per bet = win chance × payout − 1 (negative whenever there is a house edge).
- Each session places up to N bets. Both systems cap each stake at the available balance; ruin means a zero balance, including after the final bet.
- Martingale doubles the stake after each loss and resets after a win, going all-in when the bankroll cannot cover the next stake.
Sources Wikipedia: Risk of ruin · Wikipedia: Martingale (betting system) · Wikipedia: Gambler's ruin
Related reading
Frequently asked questions
Can Martingale beat the house edge?
No. It turns many small wins into rare large losses. The expected value of each bet stays negative, and the session’s expected value stays negative when any bets are placed.
What is risk of ruin?
The probability of losing your whole bankroll before you stop. Bigger bets relative to bankroll and more bets both raise it.
Is this simulation a prediction?
No. It is an educational model with the numbers you enter.
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