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

Betting Odds Converter

Converts between American, decimal, and fractional betting odds and computes implied probability and potential winnings. Essential for bettors comparing lines across multiple sportsbooks or shopping international markets.

Odds Value

Input Format

Convert To

Stake Amount ($)

Betting Odds

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

Key differences

	Betting Odds Converter	Kelly Criterion Calculator
Category	Betting Odds	Betting Odds
Inputs required	4	4
Result	Converted odds (+ winnings)	Optimal Bet Size ($)
What it does	Converts between American, decimal, and fractional betting odds and computes implied probability and potential winnings. Essential for bettors comparing lines across multiple sportsbooks or shopping international markets.	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.