Odds Converter – Change Decimals to Fractions

Use our odds converter tool to convert from fractional to decimal odds and back again. You can also find the equivalent moneyline (American) odds values, and see what fractional and decimal odds convert to in percentage terms.

Using the odds converter is very straightforward in that the decimal, moneyline and fraction odds will automatically update once you input one value, but we’ll also explain how to calculate odds conversions without the tool below.

How to use our Odds Converter

Converting fraction odds to decimal, or indeed moneyline (American) odds, really is a straightforward process when you use our free odds converter tool. Here’s a step-by-step guide to walk you through it.

1. Enter the odds you want to calculate. We’ll use the fractional odds of 7/4 as an example.

2. In this case, the 7 would need to be entered in the first ‘fraction’ box, and the 4 in the second, as below.

3. The rest of the boxes will be automatically filled. So here you can see that the decimal equivalent of 7/4 is 2.75, the moneyline odds would be +175, and the implied probability is 36.4%.

4. Our odds converter works in each direction, so you can also start by entering the decimal odds 2.75 to find the fractional odds conversion is 7/4.

Odds Converter Table

As an alternative to using our betting odds converter, you can also check out the most common fractional odds below, alongside the decimal odds, moneyline odds and the implied probabilities of each set of odds.

Using the Fulham vs West Ham match as an example, you can scan the table to see Fulham are 11/8 to win the match, which can also be written as 2.37 in decimal odds or +137 in moneyline odds, with an implied probability of around 42% of claiming victory. This compares to West Ham who are priced at 2/1 in fractions, 3.0 in decimals and +200 using moneyline odds, with an implied probability of 33%.

Fraction	Decimal	Moneyline	Probability
1/100	1.01	-10000	99%
1/10	1.1	-1000	90.9%
1/6	1.17	-600	85.7%
1/5	1.2	-500	83.3%
1/4	1.25	-400	80%
1/3	1.33	-300	75%
2/5	1.4	-250	71.4%
4/9	1.44	-225	69.2%
1/2	1.5	-200	66.7%
8/15	1.53	-188	65.2%
4/7	1.57	-175	63.6%
8/13	1.62	-162	61.9%
4/6	1.67	-150	60%
8/11	1.73	-137	57.9%
4/5	1.8	-125	55.6%
5/6	1.83	-120	54.5%
10/11	1.91	-110	52.4%
Evens	2.0	+100	50%
11/10	2.1	+110	47.6%
6/5	2.2	+120	45.5%
5/4	2.25	+125	44.4%
11/8	2.37	+137	42.1%
6/4	2.5	+150	40%
13/8	2.63	+163	38.1%
7/4	2.75	+175	36.4%
15/8	2.88	+188	34.8%
2/1	3.0	+200	33.3%
9/4	3.25	+225	30.8%
5/2	3.5	+250	28.6%
11/4	3.75	+275	26.7%
3/1	4.0	+300	25%
10/3	4.33	+333	23.1%
7/2	4.5	+350	22.2%
4/1	5.0	+400	20%
9/2	5.5	+450	18.2%
5/1	6.0	+500	16.7%
11/2	6.5	+550	15.4%
6/1	7.0	+600	14.3%
13/2	7.5	+650	13.3%
7/1	8.0	+700	12.5%
15/2	8.5	+750	11.8%
8/1	9.0	+800	11.1%
9/1	10.0	+900	10%
10/1	11.0	+1000	9.1%
12/1	13.0	+1200	7.7%
14/1	15.0	+1400	6.7%
16/1	17.0	+1600	5.9%
18/1	19.0	+1800	5.3%
20/1	21.0	+2000	4.8%
25/1	26.0	+2500	3.8%
33/1	34.0	+3300	2.9%
50/1	51.0	+5000	2%
100/1	101.0	+10000	1%
200/1	201.0	+20000	0.5%

That’s all you need to know. However, some may be interested in the maths behind the conversions too. Read on if so.

How to Convert Fraction Odds to Decimals

You can convert fractional odds into decimal odds by dividing the first number (the numerator), by the second number (the denominator), and adding 1. 

• Example: To convert fractional odds of 6/5, start by dividing 6 by 5 to get 1.20. Then add 1, and you’ll get the decimal odds equivalent of 2.20.

How to Convert Decimal Odds to Fractional

Converting decimal odds to fractional odds can be a bit more challenging than doing it the other way around, which is why our betting odds calculator is a handy tool to use.

For example, if you start with decimal odds of 6.0, simply subtract 1 to get 5.0, which translates to fractional odds of 5/1.

Some conversions aren’t as straightforward. Take decimal odds of 3.5 – subtracting 1 gives you 2.5, or 2.5/1. Since UK bookmakers don’t usually display odds with decimals, both numbers are multiplied by 2 to give the standard fractional format: 5/2.

How to Convert Moneyline Odds to Decimal

To convert moneyline odds into decimals might seem like a difficult concept to grasp, but you’ll be pleased to hear that we found the process relatively simple. Below, you’ll find a couple of examples for converting moneyline odds into decimals.

How to Convert Positive Moneyline Odds to Decimal

For positive moneyline (American) odds, you’ll have to divide the money line by 100, before adding 1. Below, you’ll see an example of this process.

• Moneyline Odds of +250.
• 250/100 = 2.50
• 2.50 + 1.00 = 3.50

How to Convert Negative Moneyline Odds To Decimal

For negative moneyline odds, you should disregard the negative symbol in front of the odds for calculating it into a decimal. You’ll need to divide 100 by the moneyline odds, before adding 1.

• Moneyline Odds of -130.
• 100/130 = 0.76
• 0.76 + 1.00 = 1.76

What are the main types of betting odds?

There are three different types of betting odds which you can use, and you can typically choose which type of betting odds to use as they should be available on all betting sites. The three different formats have no effect on the odds, they are just alternate ways of using them. Here are the three odds with examples of what they look like on bet365.

Decimal (European) Odds: These odds show you how much you could win for every £1 bet.

Fractional (British) Odds: These odds show the ratio of the amount of profit you could win if your bet comes through.

Moneyline (American) Odds: These odds are slightly different as they could have a + or a – symbol beside them. If there is a negative sign in front of the number, it shows you how much you need to bet to win £100. If they have a + sign then it shows the amount you win if you bet £100.

How to calculate Implied Probability from Fractional Odds

Using our betting odds converter to calculate the implied probability is undoubtedly the quickest and easiest method to use, but you can also help to know the manual conversion process. Divide the second number by the total of the first number and second number. Equation:  Denominator / (numerator+ denominator ) * 100 = implied probability Example: 4/1 implied probability can be calculated as 1 / (4+1) * 100 = 20%

How to calculate Implied Probability from Decimal Odds

Again, using our betting odds calculator for your odds conversion from decimal odds to implied probability is the simplest solution, but the manual process is as follows. Divide 1 by the decimal, and multiply it by 100%. Equation: (1/ decimal odds) * 100 = implied probability Example: 1 /4.00 * 100 = 25%

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Odds Converter FAQs

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