American 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 American Odds to Implied Probability Converter

To use our American Odds to Implied Probability converter, simply enter your American 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 American odds to an Implied Probability

To convert American odds to an Implied Probability:

For Positive American Odds, (divide 100 by (the American odds plus 100)) and multiply this by 100. Example for +300 American odds: (100 / (300 + 100)) * 100 = 25%

For Negative American Odds, convert the American odds to a positive number, then divide it by the (positive American odds plus 100). Finally, multiply this by 100. Example for -300 odds: ((-300 * -1) / ((-300 * -1) + 100)) * 100 = 75%

American odds and Implied Probability Explained

Here are the basics of American odds and implied probabilities.

American Odds

As you'd suspect, American odds are the primary format used in the United States. Odds in this format are expressed as a number greater than or equal to +100 or less than -100.

  • American odds greater than +100 are underdogs. The larger the number, the less likely a result is to occur. +110 is a relatively slight underdog with a 47.62% implied probability to win, while +300 odds imply only a 25% chance. You stand to profit $110 if you bet $100 at +110 odds or $300 if you bet $100 at +300 odds.
  • American odds less than -100 are favorites. The smaller the number, the higher the implied probability a side has to win. -110 is a slight favorite with a 52.36% implied probability, while -300 implies a 75% chance. You must risk $110 to potentially profit $100 at -110 odds, and you'd have to risk $300 to potentially profit $100 at -300 odds.
  • American odds at exactly +100 (or -100) have an implied probability of 50%. A +100 bet pays out even money, so if you bet $100 at +100, you stand to profit $100.

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!