How this tool works
This odds converter is the high-volume format tool: type one price and read the other two plus implied probability.
Convert betting odds
Enter any format. The table updates fractional, decimal, American and implied chance.
Accepts fractional (5/2), decimal (3.50) and American (+250 / -110) odds.
Why odds conversion has search demand
UK shops still show fractions. Exchanges and many apps use decimal. US sportsbooks use moneyline. An odds converter is the page people open when those formats collide.
Quick method
Decimal = 1 + (numerator / denominator). Implied probability = 1 / decimal. American plus prices are profit on a 100 stake; minus prices show the stake needed to win 100.
FAQ
What is 5/2 in decimal?
5/2 is 3.50 decimal, +250 American, and about 28.57% implied probability.
What does -110 mean?
You stake 110 to win 100. Decimal is about 1.91.
Does implied probability include the bookie margin?
Yes. A two-way market that sums to more than 100% contains overround.
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Important note
These calculators are for information only. Bookmaker rules, Rule 4, dead heats, each-way terms, maximum payouts and promotion conditions can change the real return. 18+ only. Please gamble responsibly.