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Both calculators run independently — change the inputs on either side to compare results.

Kelly Criterion Calculator

Calculates the mathematically optimal percentage of your bankroll to wager on a positive-EV bet using the Kelly Criterion, with optional fractional Kelly for reduced variance. Use it to maximize long-run growth while controlling ruin risk.

Total Bankroll ($)

Decimal Odds

Win Probability (%)

Kelly Fraction

Betting Odds

Expected Value Calculator

Calculates the expected monetary value of a bet over any number of repetitions, revealing its long-run profitability. Use it to decide whether a wager offers a genuine edge over the bookmaker's price.

Bet Amount ($)

Bookmaker Odds

True Win Probability (%)

Calculation Period

Key differences

	Kelly Criterion Calculator	Expected Value Calculator
Category	Betting Odds	Betting Odds
Inputs required	4	4
Result	Optimal Bet Size ($)	Expected Value ($)
What it does	Calculates the mathematically optimal percentage of your bankroll to wager on a positive-EV bet using the Kelly Criterion, with optional fractional Kelly for reduced variance. Use it to maximize long-run growth while controlling ruin risk.	Calculates the expected monetary value of a bet over any number of repetitions, revealing its long-run profitability. Use it to decide whether a wager offers a genuine edge over the bookmaker's price.