Fractional vs Decimal Odds

Fractional vs Decimal Odds

Betting odds are traditionally expressed in decimals (2/1 etc.) – this is generally the default way that odds are displayed on bookmakers’ websites.

However for matched betting, decimal odds are usually much easier to work with. In fact, betting exchanges such as Smarkets and Betfair display their odds in decimal by default.

There is usually a setting on bookmakers’ websites to switch from fractional to decimal and I strongly suggest that you go ahead and do this.

To try and explain the difference: –

  • Fractional odds show the amount you will win, and you get your initial stake back on top of your winnings.
  • Decimal odds show the total amount that will be returned.

What this means is that if you place a bet for £10 at fractional odds of 3/1, you should expect to win 3 * £10 = £30 and get your initial stake of £10 back (a total of £40 after your initial stake of £10 has been spent).

This is exactly the same as placing a bet for £10 at decimal odds of 4.0 which will result in returns of 4 * £10 = £40.

To convert fractional odds to decimal, calculate the decimal value from the fraction then add 1 (so 3/2 is the same as 1.5 which then becomes 2.5 in decimal).

Odds Table

Here are some common odds you’ll see when matched betting: –

Fractional Odds

Decimal Odds

1/5

1.20

2/9

1.22

1/4

1.25

2/7

1.29

3/10

1.30

1/3

1.33

4/11

1.36

2/5

1.40

4/9

1.44

1/2

1.50

8/15

1.53

4/7

1.57

8/13

1.62

4/6

1.67

8/11

1.73

4/5

1.80

5/6

1.83

10/11

1.91

1/1

2.00

11/10

2.10

6/5

2.20

5/4

2.25

11/8

2.37

6/4

2.50

13/8

2.62

7/4

2.75

15/8

2.87

2/1

3.00

9/4

3.25

5/2

3.50

11/4

3.75

3/1

4.00

7/2

4.50

4/1

5.00

9/2

5.50

5/1

6.00

11/2

6.50

6/1

7.00

13/2

7.50

7/1

8.00

15/2

8.50

8/1

9.00

17/2

9.50

9/1

10.00

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