Bet Calculator and Odds Converter

Use this Odds Converter to quickly converter between different odds formats, including Decimal Odds, American Odds, Fractional Odds.

You can also calculate the implied probability for odds in any of these formats or find the odds for a given implied probability.

Optionally, you can enter a bet amount into the Bet Calculator to see how much you would win from a wager given the odds you entered.

How to Use This Bet Calculator and Odds Converter

To Calculate the Payout of a Bet and How Much You'll Win, enter decimal odds, American odds, fractional odds, or implied probability into the "Enter Your Odds" section of the calculator above.

Next, enter your bet amount in the "Enter Bet Amount" section of the calculator.

Once you've entered valid odds and a valid bet amount, your total payout and the amount you'd win will automatically be calculated.

To Convert Odds to Different Odds Formats, input either decimal odds, American odds, fractional odds, or implied probability into the "Enter Your Odds" section of the converter above.

Once you've entered valid odds for one of the formats, the converter will automatically calculate your odds in the other formats. The converter can also be used to convert odds to probability and to convert probability to odds.

Please note that this calculator may slightly round your odds. For example, decimal odds and implied probability is rounded to 2 decimals.

Valid moneyline odds formats include:

• Decimal Odds - Decimal odds must be a number greater than 1.
• American Odds - American Odds must be a number greater than or equal to 100 (e.g., 115 or +115) or a number less than -100 (e.g., -115).
• Fractional Odds - Fractional odds must be a fraction (e.g., 1/1, 1/2, 5/2, etc.)
• Implied Probability - If inputting a probability, it must be expressed as a percentage (e.g., 25%). Valid probabilities for the converter must be greater than 0 and less than 100.

How to Calculate and Convert Odds

While using the odds converter is the easiest way to convert between different odds formats (we recommend bookmarking it for later!), here is the math for converting odds between different formats. 

How to Convert Odds to a Probability Percentage

To Convert Decimal Odds to an Implied Probability Percentage, (divide 1 by the decimal odds) and multiply this by 100. 

Example for 2.5 odds: (1 / 2.5) *100 = 40%

To Convert American Odds to an Implied Probability Percentage:

• 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%

To Convert Fractional Odds to an Implied Probability Percentage, (divide the denominator by the (denominator + numerator)) and multiply this by 100.

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

How to Convert Decimal Odds to American Odds

For converting decimal odds greater than or equal to 2 to American odds, multiply (the decimal odds minus 1) by 100. 

Example for 2.2 Decimal Odds: (2.2 - 1) * 100 = 120 or +120 as it's usually expressed.

For converting decimal odds less than 2 to American odds, divide -100 by (the decimal odds minus 1). 

Example for 1.5 Decimal Odds: -100 / (1.5-1) =  -200

How to Convert Decimal Odds to Fractional Odds

To Convert Decimal Odds to Fractional Odds, subtract 1 from the decimal odds and convert it to a fraction.

Example for Decimal Odds of 4: 4 - 1 = 3, which converts to 3/1

How to Convert American Odds to Decimal Odds

To Convert Positive American Odds to Decimal Odds, add 1 to (the American odds  divided by 100).

Example for +150 American odds: (150 / 100) + 1

To Convert Negative American Odds to Decimal Odds, subtract (100 divided by the American Odds) from 1.

Example for -150 American odds: 1- (100 / -150) = 1.67

How to Convert American Odds to Fractional Odds

To Convert Positive American Odds to Fractional Odds, divide the American odds by 100, turn the decimal into a fraction, and find the simplest form of the fraction.

Example for +200 American odds: 200 / 100 = 2/1

To Convert Negative American Odds Fractional Odds, divide -100 by the American odds.

Example for -200 American odds: -100 / -200 = 1/2

How to Convert Fractional Odds to Decimal Odds

To Convert Fractional Odds to Decimal Odds, divide the numerator by the denominator and add 1.

Example for 5/2 fractional odds: 5 / 2 +1 = 3.5

How to Convert Fractional Odds to American Odds

To Convert Fractional Odds Over 1/1 to American Odds, (divide the numerator by the denominator) and multiply that by 100.

For example 5/2 fractional odds: (5 / 2) * 100 = +250

To Convert Fractional Odds Under 1/1, divide -100 by (the quotient of the numerator divided by the denominator).

For example 2/5 fractional odds: -100 / (2/5) = -250