Odds Conversion Calculator

Convert between decimal, fractional and American formats and read the implied probability.

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

How to Use This Calculator

  1. Use the toggle to set the input format: Decimal, Fractional, or American
  2. Key the odds value into the input field
  3. Read the equivalent values 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 do decimal odds work?

Decimal odds express the gross return per $1 staked, stake included. A price of 2.50, for instance, returns $2.50 for each $1 wagered, which is $1.50 of net profit.

How do American odds work?

American odds are notated with + and - signs. A positive figure (+150) quantifies the profit on a $100 stake. A negative figure (-200) quantifies the stake required to net $100 in profit.

How do fractional odds work?

A fractional price such as 3/2 returns $3 of profit for every $2 staked. The numerator is the profit and the denominator is the stake.

What does implied probability mean?

Implied probability is the odds restated as a percentage, indicating how likely the bookmaker rates the outcome. The shorter the odds, the higher the implied probability.