How to use this betting tool
- Enter the requested values using the units shown.
- Review prices and assumptions before calculating.
- Select Estimate risk and use the explanation beside the result.
#063 · Bankroll & Risk Management Tool
Risk of Ruin Calculator
Approximate the probability of exhausting a bankroll from your win probability, decimal odds, flat stake, and current bankroll.
Calculator
Risk assumptions%
odds
units
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What this tool calculates
Approximate the probability of exhausting a bankroll from your win probability, decimal odds, flat stake, and current bankroll.
For an even-sized win/loss random walk, risk is approximated from the chance of loss versus win across bankroll units. For unequal payoffs, a diffusion approximation uses edge and return variance.
Treat the result as a decision aid. Verify inputs, market rules, and settlement conditions before placing a bet.
Worked example
With a 55% win rate at 2.00 odds, a 10-unit stake, and a 1,000-unit bankroll, the model shows positive expected value and a low theoretical ruin probability. Real-world risk can be higher when estimates are wrong or bets are correlated.
| Example | Interpretation |
|---|---|
| Using the default inputs | With a 55% win rate at 2.00 odds, a 10-unit stake, and a 1,000-unit bankroll, the model shows positive expected value and a low theoretical ruin probability. Real-world risk can be higher when estimates are wrong or bets are correlated. |
Tips and limitations
- Use current prices and realistic assumptions.
- Compare several scenarios instead of relying on one point estimate.
- Rounding can create small differences from sportsbook displays.
- Never stake more than you can afford to lose.
FAQ
What does the Risk of Ruin Calculator calculate?
Approximate the probability of exhausting a bankroll from your win probability, decimal odds, flat stake, and current bankroll.
Are the results guaranteed?
No. The output is a mathematical estimate based only on the values entered and cannot guarantee a betting outcome.
Which odds format should I enter?
Enter decimal odds unless an input label explicitly requests another format.
Can I use this calculator on mobile?
Yes. The calculator runs locally in a modern browser and adapts to smaller screens.
Does this tool include bookmaker rules?
No. Settlement rules, deductions, limits, and promotion terms vary by operator and should be checked separately.
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Quick reference
| Measure | Use |
|---|---|
| Primary result | Approximate risk of ruin |
| Input standard | Decimal odds where applicable |
| Audience | 18+ responsible bettors |
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