trading tool
Kelly Criterion Calculator
Use the Kelly formula as an educational math tool for risk model development.
Paste data here. It stays in your browser.
Copy-ready result appears here.
How it works
- Uses the classic Kelly fraction formula.
- Shows full Kelly and half Kelly estimates.
- Treats all inputs as assumptions.
Common use cases
- Prototype risk models.
- Compare assumed strategy parameters.
- Teach sizing theory carefully.
Assumption-sensitive formula
Kelly sizing depends heavily on assumed win rate and reward/risk ratio. Small errors in those assumptions can produce misleading sizing outputs.
Conservative interpretation
Many educational examples also show fractional Kelly values because full Kelly can be aggressive and volatile.
FAQ
Is my input uploaded?
No. This MVP runs tool logic in your browser and does not send tool input to a server.
Can I use this on mobile?
Yes. Pages are mobile-first and designed for quick copy, paste, and share workflows.
Are the inputs guaranteed?
No. Win rate and reward/risk are assumptions and can be wrong.
Does the tool store history?
No. The MVP does not store tool input history or create user accounts.
Should I verify important output?
Yes. These tools are designed for productivity, but production changes and financial decisions should be independently verified.
Can the tool run after the page loads?
Yes. The interactive logic runs in the browser once the static page and JavaScript island are loaded.
What input format should I use?
Use the examples on the page as a starting point, then replace them with your own local input.
Is this financial advice?
No. Trading calculators are educational risk-management helpers and do not recommend trades or promise outcomes.
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Disclaimer
This tool is for educational and development purposes only and is not financial advice.
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