Fractional to Decimal Odds

I have put together the Fractional to Decimal Odds Chart below to make it easier for you to quickly convert the fractional odds used by most bookmakers into the decimal odds format used by betting exchanges like Betfair and Smarkets.

Some Matched Bettors claim that changing your odds format on bookie sites from Fractional to decimal odds is something the bookmakers use to identify matched bettors as regular punters will often stick to using fractional odds.

There isn’t any firm evidence to back this up but I always like to err on the side of caution so I never change my bookie accounts to decimal odds.

Matched Betting Beginners may find using Fractional Odds confusing at first but you will soon learn to do the conversions in your head.

Until then, you can make use of the below Fractional to Decimal Odds Conversion Chart.

Fractional to Decimal Odds Conversion Chart

Fractional to Decimal Odds Conversion Chart

Fractional OddsDecimal OddsImplied Probability
1/1001.0199.01%
1/501.0298.04%
3/1001.0397.09%
1/251.0496.15%
1/201.0595.24%
3/501.0694.34%
7/1001.0793.46%
2/251.0892.59%
9/1001.0991.74%
1/101.1090.91%
1/51.2083.33%
1/41.2580.00%
1/31.3375.00%
4/111.3673.33%
2/51.4071.43%
4/91.4469.23%
1/21.5066.67%
8/151.5365.22%
4/71.5763.64%
3/51.6062.50%
8/131.6161.90%
5/81.6261.54%
4/61.6660.00%
17/251.6859.52%
5/71.7158.33%
8/111.7257.89%
3/41.7557.14%
4/51.8055.56%
5/61.8354.55%
87/1001.8753.48%
10/111.9052.38%
97/1001.9750.76%
1/12.0050.00%
11/102.1047.62%
23/202.1546.51%
6/52.2045.45%
5/42.2544.44%
13/102.3043.48%
11/82.3742.11%
7/52.4041.67%
6/42.5040.00%
31/202.5539.22%
8/52.6038.46%
41/252.6438.10%
17/102.7037.04%
7/42.7536.36%
9/52.8035.71%
37/202.8535.09%
15/82.8734.78%
19/102.9034.48%
2/13.0033.33%
41/203.0532.79%
11/53.2031.25%
9/43.2530.77%
23/103.3030.30%
12/53.4029.41%
5/23.5028.57%
13/53.6027.78%
11/43.7526.67%
14/53.8026.32%
3/14.0025.00%
16/54.2023.81%
10/34.3323.08%
7/24.5022.22%
18/54.6021.74%
19/54.8020.83%
4/15.0020.00%
17/45.2519.05%
9/25.5018.18%
5/16.0016.67%
11/26.5015.38%
6/17.0014.29%
13/27.5013.33%
7/18.0012.50%
15/28.5011.76%
8/19.0011.11%
17/29.5010.53%
9/110.0010.00%
19/210.509.52%
10/111.009.09%
11/112.008.33%
12/113.007.69%
13/114.007.14%
14/115.006.67%
15/116.006.25%
16/117.005.88%
17/118.005.56%
18/119.005.26%
19/120.005.00%
20/121.004.76%
25/126.003.85%
30/131.003.23%
40/141.002.44%
50/151.001.96%
60/161.001.64%
70/171.001.41%
80/181.001.23%
90/191.001.10%
100/1101.000.99%
1000/11001.000.10%

How to Convert Fractional Odds into Decimal Odds

To illustrate how you can convert fractional odds into decimal odds we will use fractional odds of 18/5.

To convert 18/5 into decimal odds we divide the 18 by the 5 then add 1 to the result to get decimal odds of 4.6 (see below).

How to work out the implied probability based on the decimal odds

Put simply, Implied Probability is the percentage change an event will occur based on the odds being offered.

To work out the Implied Probability, you simply divide 1 by the decimal odds available. For example, odds of 1.01 has an implied probability of 99.01% (see below).

How to work out the implied probability based on the fractional odds

To illustrate how to work out the implied probability based on the fractional odds, we will use fractional odds of 1/100.

To calculate the implied probability of a 1/100 shot, we divide 1 by 100 then add 1 to the result.

We then divide the result of that calculation into 1 to get an implied probability of 99.01% (see below).

Fractional to Decimal Odds Converter

If you are looking for a Fractional to Decimal Odds Converter, then I recommend using the excellent one provided by Smarkets.