Free Online Betting Odds Converter
Convert Between Decimal, American, and Fractional Betting Odds
Need to use Betting Odds Converter right now?
Sportsbooks and betting markets around the world use different odds formats — decimal odds are common in Europe and Australia, American (moneyline) odds dominate US sportsbooks, and fractional odds are traditional in the UK — and comparing odds across formats or platforms requires converting between them correctly.
Fractional odds
3/2
Implied probability
40.0%
Implied probability doesn't account for the bookmaker's margin (vig), so probabilities across all outcomes will typically sum to slightly over 100%.
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Features
- Runs entirely in your browser
- Privacy-first — your data is never uploaded
- Real-time, instant results
- 100% free, no sign-up required
- Works on desktop, tablet, and mobile
- No installation needed
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About Betting Odds Converter
Sportsbooks and betting markets around the world use different odds formats — decimal odds are common in Europe and Australia, American (moneyline) odds dominate US sportsbooks, and fractional odds are traditional in the UK — and comparing odds across formats or platforms requires converting between them correctly.
This tool converts between all three formats instantly: enter odds in decimal or American format and see the equivalent in all three systems, plus the implied win probability that the odds represent, letting you quickly evaluate or compare betting lines regardless of which format they're quoted in.
It also computes the fractional odds representation by finding the closest simple fraction to the decimal value, matching how fractional odds are typically displayed (like 5/1 or 7/2) rather than as an unreduced decimal ratio.
How it works
- Enter odds in one format. Input decimal odds or American odds — the other updates automatically.
- See all three formats. View fractional odds and implied probability alongside your input.
- Compare across sportsbooks. Use the converted values to compare lines quoted in different formats.
Examples
Decimal odds of 2.50
Input
Decimal: 2.50
Output
American: +150, Fractional: 3/2, Implied probability: 40.0%