How to Convert Betting Odds (Decimal, Fractional, American)

Convert Betting Odds

It is vital to know how to convert different betting odds so that you can play with a variety of bookmakers worldwide. In the United States of America, American odds are used, across Europe, Decimal odds are used. Fractional odds are a more traditional method that is mostly used in horse racing.

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Here is a step by step guide on how to convert the different odds types:

Decimal to Fractional conversion:

Let’s use a 1.75 decimal odd as an example:

  • Remove 1 from the decimal odd and convert it to a fraction.
    1.75 – 1 = 0.75 = 75/100
  • Reduce the fraction to the simplest form.
    75/100 = 3/4

3/4 is the Fraction odds equivalent of 1.75 Decimal odds.

Decimal to American conversion:

There are two methods, one for decimal odds more than 2.00 and one for decimal odds less than 2.00.

To convert a decimal odd of 2.00 or higher, let’s use 3.35 as an example:

  • The moneyline equals the decimal odds minus 1 times 100.
    (3.35 – 1) x 100 = +235

+235 is the American odds equivalent of 3.35 Decimal odds.

To convert a decimal odd of less than 2.00, let’s use 1.9091 as an example:

  • The moneyline equals -100 divided by the decimal odds minus 1.
    (-100) / (1.9091 – 1) = -109.99 = -110
  • Then round the answer off into the closest round number.
    109.99 = -110

-110 is the American odds equivalent of 1.9091 Decimal odds.

Fractional to American conversion:

There are two methods, one for fractional odds more than 1/1 and one for fractional odds less than 1/1.

To convert a fractional odd of 1/1 or higher, let’s use 7/4 as an example:

  • Convert the fraction to decimals by multiplying it by 100.
    7/4 * 100 = 1.40
  • Then multiply that number by 100 again.
    1.40 * 100 = +140

+140 is the American odds equivalent of 7/4 Fractional odds.

To convert a fractional odd of 1/1 or lower, let’s use 1/10 as an example:

  • Convert the fraction to decimals by multiplying it by 100.
    1/10 * 100 = 0.1
  • Divide -100 by that answer.
    -100/0.1 = -1000

-1000 is the American odds equivalent of 1/10 Fractional odds.

Fractional to Decimal conversion:

Let’s use a 3/4 fractional odd as an example:

  • Convert the fraction to a decimal by multiplying it by 100.
    3/4 x 100 = 0.75
  • Add 1 to the decimal answer.
    0.75 + 1 = 1.75

1.75 is the Decimal odds equivalent of 3/4 Fractional odds.

American to Decimal conversion:

There are two methods, one for positive (+) odds and one for negative (-) odds.

To convert a positive odd, let’s use +235 as an example:

  • Divide the money line by 100.
    235/100 = 2.35
  • Add 1 to the previous answer.
    2.35 + 1 = 3.35

3.35 is the Decimal odds equivalent of +235 American odds.

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To convert a negative odd, let’s use -110 as an example:

  • Divide 100 by the money line.
    100/110 = 0.9091
  • Add 1 to the previous answer.
    0.9091 + 1 =1.9091

1.9091 is the Decimal odds equivalent of -110 American odds.

Luckily, most online bookmakers have options to convert the odds automatically, but it is always a good idea to know the maths behind odd conversions in case that option isn’t available.

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