Kelly Criterion Calculator
Compute the mathematically optimal stake for long-term bankroll growth.
How the Kelly Criterion Calculator works
Enter odds and your true win probability; we return the Kelly fraction and stake.
Every result updates instantly in your browser — nothing is sent to a server, and you can share the URL to save your setup.
When to use it
Use this tool any time you want to double-check a bookmaker's pricing, size a bet correctly, or convert between the odds format your book displays and the format you think in.
Related Xtabet tools
Xtabet ships a full toolbox of betting calculators. Browse the /tools index for the complete list of odds converters, EV calculators and staking planners.
Frequently asked questions
Is this Kelly Criterion Calculator free?+
Yes — every Xtabet calculator is free and runs entirely in your browser.
Which odds format does it use?+
You can enter decimal or American odds — the tool auto-detects and normalises internally.
Does Xtabet store the numbers I enter?+
No. The maths runs client-side; nothing you type leaves your device.
Read more on Xtabet
Xtabet tools are for informational use only. 18+. Bet responsibly.