Bankroll & risk
⛰️ Risk of Ruin / Drawdown
Probability of losing your bankroll given edge, odds and bet size.
Result
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How it works
The formula
Approx risk of ruin ≈ ((1−edge)/(1+edge))^(bank/bet) for even-money-ish bets.
Example: 100 units, 2% edge, 1u bets → RoR ≈ 2%.
FAQ
Questions
What is risk of ruin?
The chance of losing your entire bankroll before variance turns positive.
How to lower it?
Smaller bet fraction, bigger edge, larger bankroll.
More tools
Related calculators
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Kelly Criterion
Optimal stake size from your edge — full, half & quarter Kelly.
⏱️
Session Budget
How long a bankroll lasts at a given bet size and pace.
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Staking Plans Simulator
Simulate Martingale, Fibonacci, D’Alembert, flat — with a bankroll chart.
For entertainment & education only. OSOTOTO does not offer gambling. Results are mathematical estimates — variance means real outcomes differ. 18+. Need support? Self-check.
