Fractional and decimal odds are the two main ways of showing betting prices in the UK, and understanding both means you can read any market with confidence. This guide compares fractional vs decimal odds, explaining how each works, how to convert between them, and where each is used. It is general information and not betting advice, so always gamble responsibly and only stake money you can comfortably afford to lose.
Two ways of showing the same thing
Fractional and decimal odds describe exactly the same prices in different ways. Neither is more accurate; they are simply two conventions, and most betting sites let you switch between them in the settings. Understanding that the formats are interchangeable, not different kinds of odds, is the first thing to grasp. Whichever a site shows by default, you can usually change it to whichever you find easier, so there is no need to be put off by seeing one format rather than the other.
How fractional odds work
Fractional odds, the traditional British style, are written as fractions like 5/1, 7/2 or 10/3. The first number is the profit you win, and the second is the stake required to win it. So 5/1 means five pounds profit for every one pound staked, and 7/2 means seven pounds for every two. Your stake is returned on top of the profit. Understanding that the fraction expresses profit against stake is the key to reading fractional odds and knowing what a winning bet will pay.
Reading a fraction
To read a fraction, think of it as "profit to stake". With 5/1, for every one pound you stake you win five in profit. With 6/4, for every four pounds staked you win six. When the first number is bigger than the second, it is odds-against (you win more than you stake); when smaller, it is odds-on (you win less than you stake). Understanding how to interpret the two numbers lets you quickly judge both the payout and how likely the outcome is considered.
How decimal odds work
Decimal odds, common online and across Europe, are written as single numbers like 6.0, 4.5 or 2.5. The figure represents your total return per pound staked, including your stake. So 6.0 means a one pound bet returns six pounds in total. To find your return, multiply your stake by the odds. Understanding that decimal odds show the total return, not just the profit, and that you simply multiply stake by odds, makes them very easy to work with, which is why they are widely used online.
Reading a decimal
To read decimal odds, multiply your stake by the number to get your total return, then subtract your stake if you want the profit alone. At 4.0, a ten pound bet returns forty pounds total, of which thirty is profit. Decimals above 2.0 are odds-against, exactly 2.0 is evens, and below 2.0 is odds-on. Understanding how to read a decimal, and what 2.0 signifies, lets you instantly see both your potential return and whether an outcome is considered likely or unlikely.
The key difference
The main difference is what the number represents: fractional odds show your profit relative to your stake, while decimal odds show your total return including your stake. So 5/1 and 6.0 are the same price: 5/1 highlights the five pounds profit, while 6.0 highlights the six pounds total return. Understanding this single distinction, profit-only versus total-return, is the heart of the comparison, and once it clicks, switching between the two formats becomes second nature.
Converting fractions to decimals
To convert fractional odds to decimal, divide the first number by the second and add one. So 5/1 becomes (5 divided by 1) plus 1, which is 6.0. And 7/2 becomes (7 divided by 2) plus 1, which is 4.5. Adding one accounts for your returned stake. Understanding this simple conversion lets you turn any fraction into a decimal, which is useful for comparing prices or calculating returns, especially as decimals are often quicker to work with.
Converting decimals to fractions
To convert decimal odds to fractional, subtract one and express the result as a fraction. So 6.0 becomes 5, written as 5/1, and 4.5 becomes 3.5, written as 7/2. Subtracting one removes the stake portion, leaving the profit. Understanding how to convert the other way means you can move freely between the two formats whichever a site uses. In practice, most betting accounts do this conversion for you, but knowing the method helps you understand what the numbers mean.
Odds-on in each format
Odds-on outcomes, those more likely than not, look different in each format. In fractions, odds-on is written with the bigger number second, like 1/2 (win one pound for every two staked). In decimals, odds-on is any figure below 2.0, like 1.5. Both express the same thing: a likely outcome paying less than your stake in profit. Understanding how odds-on appears in each format helps you recognise short prices on favourites, which can otherwise look confusing the first time you see them.
Which format is used where
Fractional odds remain traditional in UK horse racing and high-street betting shops, while decimal odds dominate online, in exchanges, and across Europe. American odds are a third format used mainly in the US. Our guide on American odds explained covers those. Understanding where each format tends to be used helps you know what to expect, though most online sites let you choose, so you can stick with whichever you find clearest regardless of the setting.
Which should you use?
Neither format is better; it comes down to preference. Many beginners find decimals easier because calculating returns is a simple multiplication, while others prefer the tradition and feel of fractions. Our guide on calculating betting returns works through both. Understanding that the choice is yours, and that you can switch in your account settings, means you can pick whichever helps you read prices and work out potential winnings most comfortably, without it affecting the odds themselves.
A quick reference
It can help to memorise a few common odds in both formats. Evens is 1/1 or 2.0. A price of 2/1 is 3.0, 3/1 is 4.0, and 4/1 is 5.0, because you add one to the fraction for the decimal. Odds-on examples include 1/2, which is 1.5, and 4/5, which is 1.8. Half-fractions are common too: 5/2 is 3.5 and 9/4 is 3.25. Our guide on calculating betting returns uses these. Keeping a handful of these conversions in mind makes it quick to switch between the two formats in your head, so neither one ever leaves you guessing what a price really means.
In short
Fractional and decimal odds show the same prices differently: fractions like 5/1 show profit relative to stake, while decimals like 6.0 show total return including stake, so 5/1 equals 6.0. To convert a fraction to a decimal, divide and add one; to go back, subtract one. Fractions are traditional in UK racing and shops, while decimals dominate online and are simplest for calculating returns. Neither is better, so use whichever you find clearest, keep a few common conversions in mind so neither format catches you out, and always gamble responsibly.
Explore more in our Betting Odds Explained guides.