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Kelly Criterion Calculator

The optimal % to risk per trade from your edge, plus safer fractions.

%

e.g. 1.5 if you win $150 on average and lose $100.

Result

Full Kelly
25%
Half Kelly
12.5%
Quarter Kelly
6.25%

% of your account to risk per trade. Most traders use half Kelly or less.

For educational purposes only. Results are estimates based on your inputs and are not financial advice.

How it's calculated

Kelly % = W − (1 − W) ÷ R, where W is the win rate and R is average win ÷ average loss.

Full Kelly maximises long-term growth in theory but produces very large drawdowns; most traders use half or a quarter of it. A negative result means the strategy has no edge with these numbers.

Related tools

Track the trades behind these numbers

NovaTrade journals every MT5 trade automatically and shows your real win rate, R and drawdown.

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