Odds Helper
Pop in odds in any format and instantly see all the equivalents.
How to Use This Calculator
- Pick the odds format you want to enter (Decimal, Fractional, or American)
- Type the odds value into the input box
- See the matching odds in all three formats plus 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
How does this differ from the Betting Odds Calculator?
Both do exactly the same conversion. This one is a stripped-back version built purely for quick odds conversion, without the extra features.
Which odds format do people use most?
Decimal odds are the norm across Europe and Australia, Fractional odds are the traditional choice in the UK and Ireland, and American odds are used mainly in the United States.
How do I switch American odds over 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. As examples, +150 turns into 2.50 and -200 turns into 1.50.