Odds Conversion Betting Tool
Convert between decimal, fractional and American odds and read the implied probability.
How to Use This Calculator
- Use the toggle to choose the odds format you wish to work in (Decimal, Fractional, or American)
- Type the odds value into the input field
- Review the equivalent price expressed across all three formats, together with the implied probability
Examples:
- Decimal: 2.50
- Fractional: 3/2
- American: +150 or -200
Formula
Decimal to Fractional: Fractional = Decimal - 1 (expressed as a fraction)
Decimal to American:
- If Decimal >= 2.00: American = (Decimal - 1) x 100
- If Decimal < 2.00: American = -100 / (Decimal - 1)
Implied Probability: 1 / Decimal Odds x 100%
Frequently Asked Questions
How should I interpret decimal odds?
Decimal odds express the full return for every $1 you stake, with your stake included in that figure. A price of 2.50, for instance, returns $2.50 on each $1 wagered, which equates to a profit of $1.50.
What is the meaning of American odds?
American odds are written with a plus or minus sign. A positive figure such as +150 indicates the profit earned on a $100 wager, while a negative figure such as -200 indicates the amount you must stake in order to profit $100.
How do fractional odds work?
A fractional price such as 3/2 tells you that $3 is won for every $2 placed. The leading number represents the profit and the trailing number represents the size of your stake.
What does implied probability represent?
Implied probability translates a set of odds into a percentage that reflects how likely the bookmaker considers an outcome to be. The shorter the odds, the higher the implied probability.