Kelly Stake Calculator

Calculate optimal bet size given your edge over the market.

Your estimated true probability (55.0%) American odds Decimal: 2.000 • Implied: 50.0% Bankroll ($) Fractional Kelly (25%)

Recommended stake

$25.00

2.50% of bankroll • Edge: 5.00%

How Kelly works

The Kelly criterion gives the bet size that maximizes long-run logarithmic growth of your bankroll. Full Kelly is mathematically optimal but volatile — most professionals use a fractional multiplier (typically 0.25 to 0.5) to reduce drawdown risk.

By Anton Volkov — The Quant.