Odds Calc
Any odds in, every format out — instantly.
How to Use This Calculator
- Pick the odds format you want to enter (Decimal, Fractional, or American)
- Type the odds value into the input field
- Read off 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 run the exact same conversion. This one is a stripped-back version built purely for fast odds conversion, with none of the extra trimmings.
Which odds format dominates?
Decimal odds rule Europe and Australia, Fractional odds remain the tradition across the UK and Ireland, and American odds hold sway mainly in the United States.
How do I convert American odds to Decimal?
Positive American odds: divide by 100, then add 1. Negative American odds: divide 100 by the absolute value, then add 1. So +150 turns into 2.50, and -200 turns into 1.50.