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.

Instantly convert betting odds in any format. Supports decimals, fractions, American odds. The tool will also tell you how likely the event is to occur to help you know what your chances of winning are. Plus when you're away from a computer or mobile, learn how to manually convert the odds. Negative american odds - Negative 100 divided by (the decimal odds minus one) e.g. A decimal value of 1.2 = -100 / (1.2 - 1) = -500. Also See Betting Calculator - Enter your odds and stake to calculate bet returns for all types of sport wager.

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

Decimal to Fractional conversion:

Used widely in the USA, American odds are simply another way bookmakers present their chosen odds. American odds use the plus and minus sign to convey the potential return for any bet. American odds always use a baseline value of $100. Fractional odds of 4/5 are therefore equivalent to American odds of -125 and decimal odds of 1.80. If the fraction is smaller than 1, it is known as odds-on. Calculator users will notice that.

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

Us Odds To Decimal

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

Fractional to Decimal conversion:

Decimal To American Odds

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:

Odds Calculator

• 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.

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

Decimal To American Odds Converter

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

Gambling Odds Calculator

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.

Decimal Vs American Odds