The Odds Converter instantly converts between the three formats sportsbooks use to display betting odds: American (e.g. +150, -200), Decimal (e.g. 2.50), and Fractional (e.g. 3/2). Each format expresses the same underlying probability differently — American odds are common in the United States, Decimal odds dominate Europe and Australia, and Fractional odds are traditional in the United Kingdom and Ireland for horse racing.

Type a value into any one of the three fields and the other two fill in automatically, alongside the implied probability — the chance the sportsbook is pricing in for that outcome. Add a bet amount and you'll see To Win and Total Payout for that stake. The calculator works fully offline once loaded; nothing you type is sent to a server.

This site also includes free calculators for Parlay (with system bets), Each-Way racing (with Rule 4), Teasers, Asian Handicap (whole, half, and quarter lines), Arbitrage, and Matched Betting (back/lay). All bet history is stored only on your device. Read more about the site and responsible-gambling resources.