Fractional Odds to Implied Probability Converter

Select the odds formats you're converting to/from, then enter your odds.
Share Odds Conversion:

How to Use Our Fractional Odds to Implied Probability Converter

To use our Fractional Odds to Implied Probability converter, simply enter your Fractional odds in the "Odds" input field.

The tool will automatically output your Implied Probability after you've input valid odds.

It's also possible to change the "From Odds Format" and "To Odds Format".

Lastly, you may also want to check out our odds converter which let's you convert between Decimal, American, Fractional, Implied Probability, Hong Kong, Malaysian, and Indonesian odds all from one page!

How to Convert Fractional odds to an Implied Probability

To convert Fractional odds to an Implied Probability:

(Divide the denominator by the (denominator + numerator)) and multiply this by 100.

Example for 5/6 fractional odds: (6 / (6 + 5)) * 100 = 54.55%

Fractional odds and Implied Probability Explained

Here are the basics of Fractional odds and implied probabilities.

Fractional Odds

Most popular in the United Kingdom and Ireland, fractional odds are expressed as a fraction where the denominator is the amount bet, and the numerator is your potential winnings. For example, if you win a bet placed at 1/3 odds, you'll profit $1 for every $3 bet.

Fraction odds are also commonly used in the United States for horse racing.

  • Fractional odds greater than 1 are underdogs, with larger fractions having a lower implied probability. 11/10 has an implied probability of 47.62% and 3/1 is 25%.
  • Fractional odds less than 1 are favorites, with smaller fractions having a higher implied probability. 10/11 is an implied probability of 52.38% and 1/3 is 75%.
  • 1/1 has an implied probability of exactly 50%.

Implied Probability

While sportsbooks don't typically express their odds in implied probabilities, all common odds formats can be converted to an implied probability. An implied probability is the percentage of times you'd need to win a bet (if you could bet it an infinite number of times) for that bet to breakeven.

For example, if your odds convert to an implied probability of 60%, your bet theoretically needs to win 60% of the time to breakeven. If it wins more than 60%, it'd be a profitable bet.

Keep in mind that sportsbooks add vig ("juice", "house edge", "tax", "fees", etc.) to their odds, meaning the implied probabilities of all outcomes for a scenario will have implied probabilities totaling greater than 100%.

More Odds Converters

See all of our converters below or check out our odds converter that let's you convert between all seven odds formats on one page!