Odds Calculator

Quick and simple odds conversion tool. Enter odds in any format and see the equivalent in all other formats, plus the implied probability percentage.

Please enter valid odds
Results
Decimal --
Fractional --
American --
Implied Probability --

How to Use This Calculator

  1. Select the odds format you want to enter (Decimal, Fractional, or American)
  2. Type the odds value in the input field
  3. View the equivalent odds in all three formats and the implied probability

Formula

Decimal to Fractional: (Decimal - 1) expressed as a simplified fraction

Decimal to American:

  • If Decimal >= 2.00: American = (Decimal - 1) × 100
  • If Decimal < 2.00: American = -100 / (Decimal - 1)

Implied Probability: 1 / Decimal Odds × 100%

Frequently Asked Questions

What is the difference between this and the Betting Odds Calculator?

They perform the same conversion. This is a streamlined version focused purely on quick odds conversion without additional features.

Which odds format is most common?

Decimal odds are standard in Europe and Australia, Fractional odds are traditional in the UK and Ireland, and American odds are used primarily in the United States.

How do I convert American odds to Decimal?

For positive American odds: divide by 100 and add 1. For negative American odds: divide 100 by the absolute value and add 1. For example, +150 becomes 2.50 and -200 becomes 1.50.