Odds Conversion Sports Calculator

Swap decimal, fractional and American odds and see the chance behind them.

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

How to Use This Calculator

  1. Tap the toggle to pick your odds format (Decimal, Fractional, or American)
  2. Type the odds into the input box
  3. Instantly see the same odds in all three formats, plus 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 do decimal odds work?

Decimal odds show your total return for every $1 you stake, including the stake itself. So odds of 2.50 mean you get back $2.50 for each $1 you bet, which is $1.50 in profit.

How do American odds work?

American odds come with a + or - sign. A plus number like +150 shows the profit on a $100 bet, while a minus number like -200 shows how much you’d need to stake to make $100 profit.

How do fractional odds work?

With fractional odds like 3/2, you win $3 for every $2 you put down. The first number is your profit and the second is the amount you stake.

What does implied probability mean?

Implied probability turns odds into a percentage that reflects how likely the bookmaker rates an outcome. The shorter the odds, the higher that probability.