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Kelly Criterion calculator
The math-optimal bet size for long-run growth. Enter your win rate and payoff ratio, and we'll show full Kelly and the half-Kelly most pros run instead.
Half-Kelly (recommended)–
Full Kelly–
Kelly is the bet size that maximizes long-run growth. Full Kelly is mathematically optimal but brutally volatile. Most pros run half-Kelly for far smoother equity at nearly the same growth.
Percentages are of total capital, per trade. Assumes your win rate and payoff are real and stable: overestimate either and Kelly will oversize you.
Free to use, no signup. Educational tool, not financial advice.
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