Odds Conversion Betting Calculator

Decimal, fractional, American and implied probability.

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

How to Use This Calculator

  1. Pick your odds format from the toggle: Decimal, Fractional, or American
  2. Type the odds value into the input field
  3. Read the equivalent odds across all three formats, plus 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

Decimal odds — what are they?

Decimal odds state total return per $1 staked, stake included. Odds of 2.50 return $2.50 for each $1 wagered, a $1.50 profit.

Define American odds.

American odds carry + or - signs. A positive figure (+150) gives profit on a $100 stake. A negative figure (-200) gives the stake required to profit $100.

How do fractional odds work?

Fractional odds such as 3/2 return $3 profit per $2 staked. The first number is profit; the second is the stake.

Implied probability — definition?

Implied probability restates odds as a percentage reflecting the bookmaker’s assessed likelihood of the outcome. Shorter odds map to higher implied probability.