Interactive calculation

Kelly Criterion Calculator

Estimate full, half and quarter Kelly bankroll fractions while clamping negative edge to zero.

Result

This is a mathematical estimate, not financial advice or a promise of profit.

How it works

f* = (b × p − q) ÷ b

Here b is net winnings per unit, p is win probability and q is loss probability. Fractional Kelly reduces size and risk.

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Frequently asked questions

No. It only shows a mathematical scenario based on your inputs; actual outcomes depend on estimate quality, odds and variance.

Use decimal odds such as 1.85 or 2.40. Check current availability and regional terms yourself.

18+ All materials are informational and do not guarantee any outcome. Predictions are produced by an automated model; the method is described on the Method page. Responsible gambling