Kelly Criterion Calculator
Find the mathematically optimal position size from your win rate and win/loss ratio using the Kelly Criterion β with a safer half-Kelly.
Result
Enter values to see the result.
How to use the Kelly Criterion Calculator
- 1Enter your Win rate (in %).
- 2Enter your Win / loss ratio (in : 1) β Average win divided by average loss.
- 3Enter your Account size (in USD).
- 4The result and full breakdown update instantly β no signup, no waiting, and your numbers never leave your browser.
About the Kelly Criterion Calculator
Find the mathematically optimal position size from your win rate and win/loss ratio using the Kelly Criterion β with a safer half-Kelly. It's a free tool in our trading calculators collection on TheCryptoTools, runs entirely in your browser, and works on mobile. If you found it useful, try Crypto Win Rate Calculator, Trade Expectancy Calculator and Position Size Calculator.
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Frequently asked questions
οΌWhat is the Kelly Criterion?
A formula for the bet size that maximizes long-term capital growth: f = W β (1 β W) / R, where W is your win probability and R is your average win divided by average loss.
οΌWhy use half-Kelly?
Full Kelly gives the fastest growth but big drawdowns and is very sensitive to wrong inputs. Half-Kelly keeps most of the growth with far less volatility.
οΌWhat if the result is 0%?
It means your win rate and payoff don't give you a positive edge, so the maths says the optimal bet is nothing. Improve your edge before sizing up.
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For educational purposes only. Kelly Criterion Calculator results are estimates, not financial advice.