Odds converter
Decimal ↔ fractional ↔ American ↔ implied probabilityChange any field and the other three update.
Inputs are kept in the URL so you can share the result.
How it works
All four formats describe the same price. Decimal odds are the total return per unit staked. Implied probability is 1 divided by the decimal price.
Worked example. Decimal 2.50 → profit of 1.50 per unit → fractional 3/2 → American +150. Implied probability = 1 ÷ 2.50 = 40%.
For prices below 2.00 the American format is negative: decimal 1.50 = 1/2 = −200 = 66.7%.
FAQ
Does implied probability include the margin?
Yes. The three 1X2 probabilities add up to more than 100%. Use the No-vig calculator to remove the margin.
Which format should I use?
Decimal is the easiest to compare and the one used on InPlay90 charts.
More calculators
No-vig calculator
1X2 prices2.30 · 3.50 · 3.00Bookmaker margin5.4%Fair probability41.3% · 27.1% · 31.6%Fair prices2.42 · 3.69 · 3.16
Expected value calculator
Price2.50Your probability45%Stake10.00Expected value+1.25 (+12.5%)