KELLY CALCULATOR

Calculate optimal bet sizing using the Kelly Criterion for maximum bankroll growth

Calculator

BANKROLL ($)

WIN PROBABILITY (%)

AMERICAN ODDS

What is Kelly Criterion?

The Kelly Criterion is a mathematical formula that helps determine the optimal bet size to maximize long-term bankroll growth while minimizing risk of ruin.

Formula

Kelly % = (bp - q) / b

b = decimal odds

p = win probability

q = loss probability (1-p)

Best Practices

Use fractional Kelly (½ or ¼) to reduce variance
Never bet more than Kelly suggests
Requires accurate probability estimates
Assumes you have an edge (positive EV)
Recalculate as your bankroll changes