Free Betting Tools
Sharpen your edge with these free calculators. No signup required.
Odds Converter
Convert between decimal, fractional, American odds and implied probability instantly.
Use tool →Arbitrage Calculator
Find sure bets and calculate optimal stakes for guaranteed profit across bookmakers.
Use tool →Margin Calculator
Calculate bookmaker margin, overround and fair odds for any betting market.
Use tool →Kelly Criterion Calculator
Find your optimal bet size using the Kelly Criterion. Includes fractional Kelly options.
Use tool →See how we compare to other odds APIs: vs The Odds API · vs BetsAPI · vs OpticOdds · vs SportsGameOdds