When matched betting decimal odds are a much easier format to work with, the main reason being is that they are the default odds format used by betting exchanges such as Betfair. It is easier to therefore convert bookmakers odds to decimal or use the tools that many bookmakers have on their sites to show decimal odds instead of fraction odds. The free spreadsheet available in the downloads section of this site is also set up to work in decimal so it makes sense to use this method.

To calculate decimal from fraction odds take the fraction and convert it into a whole number then add 1, for example: 1/2 = 0.5 (one divided by 2 = half or 0.5) plus 1.0 = 1.5 so the decimal for 1/2 = 1.50.

For those unfamiliar with decimal odds or if you are using a bookmaker without the option to change the odds on their site we have provided a table of the most common odds in fractions with their decimal equivalent next to them for easy future reference:

Fraction Decimal Fraction Decimal Fraction Decimal
1/5 1.20 5/4 2.25 5/1 6.00
2/9 1.22 11/8 2.38 11/2 6.50
1/4 1.25 7/5 2.40 6/1 7.00
2/7 1.29 6/4 2.50 13/2 7.50
3/10 1.30 8/5 2.60 7/1 8.00
1/3 1.33 13/8 2.63 15/2 8.50
4/11 1.36 7/4 2.75 8/1 9.00
2/5 1.40 9/5 2.80 17/2 9.50
4/9 1.45 15/8 2.86 9/1 10.00
1/2 1.50 2/1 3.00 10/1 11.00
8/15 1.53 11/5 3.20 11/1 12.00
4/7 1.57 9/4 3.25 12/1 13.00
8/13 1.62 12/5 3.40 13/1 14.00
4/6 1.66 5/2 3.50 14/1 15.00
8/11 1.77 13/5 3.60 15/1 16.00
4/5 1.80 11/4 3.75 16/1 17.00
5/6 1.83 3/1 4.00 18/1 19.00
10/11 1.91 10/3 4.33 20/1 21.00
Evs 2.00 7/2 4.50 25/1 26.00
11/10 2.10 4/1 5.00 33/1 34.00
6/5 2.20 9/2 5.50 100/1 101.00