Bankroll Protection Algorithm updated: Feb 2026
Risk of Ruin Calculator
Calculate the mathematical probability of losing your entire bankroll based on your win rate, odds, and stake size.
What is Risk of Ruin? Risk of Ruin is the mathematical probability that you will lose your entire bankroll before achieving your goals. Even with a profitable strategy, betting too aggressively can lead to a 100% chance of ruin.
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Developed byEvgeniy Volkov โขVerified Expert
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Survival Probability
Calculate instantly
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Optimal Safety
Protect your capital
Calculator Inputs
40%50%60%
Decimal
%
Recommended: 1-2% for safety
Number of units (100 / stake%)
Risk of Ruin
0.38%
Verdict: Excellent safety. Suitable for pros.
Expected Growth
+5.05%
per bet (edge)
Sensitivity Analysis: Risk vs Stake
FAQ
Frequently Asked Questions
Risk of ruin is the probability of losing your entire bankroll before reaching your profit goals. Even with a positive edge, aggressive staking can lead to 100% ruin probability over time.
Professional bettors aim for a risk of ruin below 1-5%. Anything above 10% means your bankroll management is too aggressive. Reduce your stake size or increase your starting bankroll to lower your risk.
Stake size is the biggest factor. Betting 1% of your bankroll per bet gives you much better survival odds than betting 5%. The Kelly Criterion suggests optimal stake sizing based on your edge and odds.
Yes. Even with a 55% win rate, betting too large a fraction of your bankroll can lead to ruin. Variance (bad luck streaks) can wipe you out before your edge kicks in. This is why bankroll management matters more than finding edges.
Reviewed by
Evgeniy Volkov
Fullstack Developer
Fullstack developer with a background in mathematics. I build the calculators and game-style tools on ToolsGambling with Pixi.js and modern web tech, and every result uses transparent probability formulas you can verify yourself.
EducationMathematics
SpecializationiGaming
StatusActive