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.
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.
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.