Math calculator
Kelly Criterion Calculator
Estimate a Kelly fraction from probability, odds, and bankroll assumptions for educational risk sizing.
Use this Kelly criterion calculator to explore how probability and payout assumptions affect theoretical risk sizing. It is educational and should not be treated as advice. CalcStack keeps the working calculator first, with FAQs and related tools nearby when you want to keep exploring.
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Calculate your estimate
Adjust one assumption at a time. The result updates automatically so you can compare changes calmly.
Result
10% Kelly fraction
$100.00 from the entered bankroll. Educational risk sizing estimate only.
Treat this as a planning estimate. Change one input to see which assumption matters most.
Scenario explorer
Try another assumption
Change one input at a time, compare the result, then use a related planning flow if the decision needs more context.
Math calculators are for informational purposes only. Results are estimates and should be checked before using them for important decisions.
How this calculator works
The calculator uses the registry formula for Kelly Criterion Calculator and updates the result from the values you enter.
- Review the default values as a starting point.
- Enter the estimated win probability for your scenario.
- Enter the decimal odds for your scenario.
- Enter the scenario bankroll for your scenario.
- Read the result and supporting note below the calculator.
- Adjust one input at a time to compare another scenario.
Frequently asked questions
What is the Kelly criterion?
The Kelly criterion is a mathematical model for theoretical risk sizing based on edge and payout assumptions.
Should I follow the Kelly result exactly?
No. This is an educational model. Real risk decisions require caution, context, and professional judgment where appropriate.
How often is this kelly criterion calculator updated?
The calculator module includes a generated update date and is refreshed when the calculator generator runs.
Next steps
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Continue with related mathtools or read a short guide before making an important decision.
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