- Betting odds are used to assess the likelihood of an event happening.
- Less likely events tend to have higher odds and offer a larger reward, while more likely events have a lower risk attached and therefore a lower reward.
- Your winnings depend on how much you wager on a given set of odds.
- Betting odds are seen in a range of formats – they are most commonly seen as fractions but are also sometimes presented as decimals.
- Thinking of getting into live cricket betting? Click here to understand how cricket betting odds work and the different cricket betting options you have.
- Compare odds and offers from the leading bookies. Get the best tips and insight. Place the smartest bets on Oddschecker. Your One Stop Betting Hub.
- Making a $10 winning bet on an NBA game priced at 5/1, would net you $60 in total. You can use the following formula to calculate potential returns with fractional odds: ( (Stake/ denominator) x numerator) + stake = return. For example: (10 x 5) + 10 = 60.
A quick introduction to betting odds
In the 'Odds' box, type in the odds you have been given. Remember to enter then in the correct format. For 'Stake', type in the amount of money you wish to bet. Calculate profit. Click 'Calculate Profit', and the betting odds calculator above will multiply the odds by the stake to determine your possible profit.
Decimal and fraction odds might seem confusing, especially if you're not familiar with online sports betting and all the betting terms and types. This handy guide is ideal for anyone new to betting, or if you're struggling to read the odds.
It contains a range of useful tips and tricks that will help you better understand just how betting odds work, so you can choose odds and place your bets with more confidence.
Here, we will highlight:
- The key points of betting odds and what you should look out for.
- How to read betting odds and make them work in your favour.
- Tips and tricks to help you understand betting odds more easily.
What are betting odds?
Betting odds are used to present the likelihood of an outcome, as well as help you understand how much you could win from a bet. They are often written out as a fraction (e.g. 2/1) or a decimal (e.g. 3.0).
Betting odds can be applied to anything that has a set outcome and is often seen in sport, football betting, entertainment, and politics. The odds measure the probability of a certain outcome, such as the result of a sports game or reality TV show, or whether a certain party gets the majority vote in an election.
How do betting odds work?
Betting odds are used to determine probability and calculate the winnings from a bet and are often seen in their decimal or fractional form. Odds are commonly recognised as being even, long, or short.
Even odds
When something is just as likely to happen as not, it is given even odds. These are presented as 1/1 in fractional odds or 2.0 in decimal odds. In this instance, your winnings would be the same as your stake.
For example: In the case of 1/1 odds, you win £1 for every £1 you bet.
Therefore, if you bet £10 you'd win £10, and return £20 in total (your £10 stake plus your £10 winnings).
Long odds
If something is statistically less likely to happen, it is given long odds. This means you have the potential to win more than you would on even odds, but the risk of losing is higher.
For example: In the case of 10/1 long odds (or 11.0 in decimal form), you could win £10 for every £1 you bet, and therefore your winnings exceed your stake.
A winning £10 bet at 10/1 odds would result in £100 winnings plus your £10 stake, therefore returning £110 in total.
Short odds
If something has a higher probability of happening, it is given short odds. While short odds are more likely to happen, the winnings will be smaller, and therefore you'll need to stake higher amounts for a bigger return.
For example: In the case of 1/10 short odds (1.10 in decimal form), you could win £1 for every £10 you bet.
Therefore, a winning £10 bet would result in £1 in winnings, amounting to a return of £11 (your £1 winnings plus your £10 stake).
How to read betting odds
Betting odds are most commonly presented as a fraction or a decimal in the UK. Moneyline odds, which are common in the US, are also becoming more popular.
Reading odds can be confusing if you're not familiar with what the different sets of numbers reflect. Here, we explain how to read decimal, fraction, and moneyline odds.
Understanding decimal odds
The simple rule of thumb with decimal betting odds is the bigger the number, the larger the return will be. For example, decimal odds of 3.75 will result in larger winnings than decimal odds of 1.75.
To work out your winnings from decimal odds, simply multiply the odds by your stake. The resulting number reflects both your winnings and your stake.
For example: If you bet £10 on odds of 3.75, you would return £37.50 – this means you'll have won £27.50 (£37.50 – your £10 stake).
Understanding fractional odds
Fractional odds are a more traditional way of displaying odds in the UK. Appearing in fraction form (e.g. 2/1), you must first work out your winnings and then add on your stake to determine your total return.
The best way to calculate your returns from fractional odds is to follow a formula:
((stake/second number) x first number) + stake = total returns
This might look complicated, but we promise it will make sense when you plug your numbers in.
For example: If you bet £10 on a 5/2 bet, your calculation would look like:
((£10/2) x 5) + £10) = £35
For longer odds with a larger return, look out for odds where the first half of the fraction is larger than the second half.
For example Odds of 5/1 will return greater winnings than odds of 1/5. If you were to stake £10 on odds of 5/1, then your return would be £60. However, if you were to stake £10 on odds of 1/5, your return would only be £12.
Understanding moneyline odds
Moneyline odds are often used in the US when betting on American sports, but they are becoming more common in Britain. They are presented as a plus (+) or minus (-) figure.
It contains a range of useful tips and tricks that will help you better understand just how betting odds work, so you can choose odds and place your bets with more confidence.
Here, we will highlight:
- The key points of betting odds and what you should look out for.
- How to read betting odds and make them work in your favour.
- Tips and tricks to help you understand betting odds more easily.
What are betting odds?
Betting odds are used to present the likelihood of an outcome, as well as help you understand how much you could win from a bet. They are often written out as a fraction (e.g. 2/1) or a decimal (e.g. 3.0).
Betting odds can be applied to anything that has a set outcome and is often seen in sport, football betting, entertainment, and politics. The odds measure the probability of a certain outcome, such as the result of a sports game or reality TV show, or whether a certain party gets the majority vote in an election.
How do betting odds work?
Betting odds are used to determine probability and calculate the winnings from a bet and are often seen in their decimal or fractional form. Odds are commonly recognised as being even, long, or short.
Even odds
When something is just as likely to happen as not, it is given even odds. These are presented as 1/1 in fractional odds or 2.0 in decimal odds. In this instance, your winnings would be the same as your stake.
For example: In the case of 1/1 odds, you win £1 for every £1 you bet.
Therefore, if you bet £10 you'd win £10, and return £20 in total (your £10 stake plus your £10 winnings).
Long odds
If something is statistically less likely to happen, it is given long odds. This means you have the potential to win more than you would on even odds, but the risk of losing is higher.
For example: In the case of 10/1 long odds (or 11.0 in decimal form), you could win £10 for every £1 you bet, and therefore your winnings exceed your stake.
A winning £10 bet at 10/1 odds would result in £100 winnings plus your £10 stake, therefore returning £110 in total.
Short odds
If something has a higher probability of happening, it is given short odds. While short odds are more likely to happen, the winnings will be smaller, and therefore you'll need to stake higher amounts for a bigger return.
For example: In the case of 1/10 short odds (1.10 in decimal form), you could win £1 for every £10 you bet.
Therefore, a winning £10 bet would result in £1 in winnings, amounting to a return of £11 (your £1 winnings plus your £10 stake).
How to read betting odds
Betting odds are most commonly presented as a fraction or a decimal in the UK. Moneyline odds, which are common in the US, are also becoming more popular.
Reading odds can be confusing if you're not familiar with what the different sets of numbers reflect. Here, we explain how to read decimal, fraction, and moneyline odds.
Understanding decimal odds
The simple rule of thumb with decimal betting odds is the bigger the number, the larger the return will be. For example, decimal odds of 3.75 will result in larger winnings than decimal odds of 1.75.
To work out your winnings from decimal odds, simply multiply the odds by your stake. The resulting number reflects both your winnings and your stake.
For example: If you bet £10 on odds of 3.75, you would return £37.50 – this means you'll have won £27.50 (£37.50 – your £10 stake).
Understanding fractional odds
Fractional odds are a more traditional way of displaying odds in the UK. Appearing in fraction form (e.g. 2/1), you must first work out your winnings and then add on your stake to determine your total return.
The best way to calculate your returns from fractional odds is to follow a formula:
((stake/second number) x first number) + stake = total returns
This might look complicated, but we promise it will make sense when you plug your numbers in.
For example: If you bet £10 on a 5/2 bet, your calculation would look like:
((£10/2) x 5) + £10) = £35
For longer odds with a larger return, look out for odds where the first half of the fraction is larger than the second half.
For example Odds of 5/1 will return greater winnings than odds of 1/5. If you were to stake £10 on odds of 5/1, then your return would be £60. However, if you were to stake £10 on odds of 1/5, your return would only be £12.
Understanding moneyline odds
Moneyline odds are often used in the US when betting on American sports, but they are becoming more common in Britain. They are presented as a plus (+) or minus (-) figure.
The moneyline shows you how much you have to bet to win £100.
For example: If you are presented with odds of +200, then your return (if you stake £100) will be £300 (your £200 winnings plus your £100 stake).
If you are presented odds of -200 (because this event is more likely) you will have to stake £200 to return £300 (your £200 stake plus £100 winnings).
To calculate the potential payout from a moneyline bet, simply follow this formula
stake x (odds/100) + stake = total returns
For example: If you are presented with odds of +200 and you bet £5, your formula would look like:
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£5 x (200/100) + £5 = £15 total returns
Converting decimal odds to fractions
Converting decimal betting odds to fractions takes a bit of basic maths knowledge.
First, take your decimal odds and subtract 1 from the number.
For example: If you have decimal odds of 3.75, subtract 1 and you are left with 2.75. These are odds of 2.75/1.
Odds need to be made up of whole numbers, so we need to take 2.75 and turn it into a whole number. The easiest way in this instance is to multiply 2.75 by 100 and move the decimal along two places. This gives us 275/100.
From there, we can work our way to finding the smallest equivalent fraction.
In this case, we can divide our fraction by 25, leaving us with fractional odds of 11/4 – previously 3.75 when presented as a decimal.
Now that you understand betting odds and how they work, you can begin to use them to your advantage. Browse all the latest sports betting odds or sign up to Grosvenor Casinos today to get started.
How to calculate betting odds return
Using our bet calculator, you can now work out how much a potential bet could return.
The calculator gives you the option to select the bet type, the win odds, your stake, and whether the bet placed will be each way or not.
Live Lines Odds
As well as finding out how much your bet will potentially return, the calculator also gives you the total profit.
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The evolution of exchange betting has revolutionised market-making to such a degree that even the biggest bookmaker names no longer employ professional odds setters.
How did odds making start?
As touched on in our Brief History of Betting blog, the concept of calculating the likely chance of a winner in a horse race, and converting that into bookmaker odds, was devised by one Harry Ogden.
Operating on Newmarket Heath towards the end of the 18th century, Ogden was the first bookmaker to take betting beyond its strikingly crude roots. Most early bets were simply a way of settling an argument over whether a named event would come to pass or not.
Not only did Ogden begin the process of making a book, he also understood that he had to save a percentage of his takings for his own purse. In order to achieve this, he slightly adjusted prices in his favour. It worked: if somebody won a bet and got paid out at odds of 4/1 they were unlikely to complain, especially at this early stage, that they had not been paid at the true probability of 5/1.
So already, within Ogden's lifetime we witnessed the evolution of a book featuring a range of prices as well as the concept of what is now known as an 'overround'.
What is an overround book?
A perfect book, without factoring in a margin for the bookie, would mean the implied probability of all outcomes would add up to 100%. However, bookies use the concept of overround to stretch this probability greater than 100% – which then becomes their profit.
Here's an overround example from a tennis match:
Now, have you ever considered why bookmakers like to encourage accumulators in sports like football where punters enjoy backing multiple selections in a single bet?
Well it's simple: if a bookmaker has an overround of 105% on each of five football matches, a punter placing a bet in all five of those matches is betting against an overround 125% because the extra 5% is factored in each time.
The growth of betting and odds compiling
By the 1950s the big firms that covered the length and breadth of the country betting on horses and greyhounds were already employing odds-makers to help them compile what was known as the 'tissue' for each race.
This was effectively the first show of prices. Bookmakers would certainly collude to some degree to check their assessments of the market were not wildly out of place but by and large they were happy to trust their instincts.
The prices were not static: they moved to respond to market forces after the first show was published on the boards.
What did a bookie do if he felt liabilities were in danger of getting too big on a particular horse? All he had to do was rub off the displayed price on his chalkboard and put up a less attractive price. He might then balance his book by pushing out the prices of less fancied runners.
The advent of legal betting shops
The golden age of betting was triggered by the 1960 Betting and Gaming Act – a watershed development that allowed betting on racing and greyhounds to take place in licensed shops around the country.
For the first time, punters did not need to be physically at a racecourse or dog track to legally place a bet. There was still an incentive for big-time punters to go racing because if they were betting in shops they had to pay tax.
But bookmakers small and large had to be on the lookout to protect themselves against betting coups in what was now 'open season' for big-stakes punters. If, for example, a group of individuals could target multiple betting shops at the same time soon before the start of a race it was hard in the pre-internet age to ensure the price was cut in time.
The Yellow Sam plot of 1975 was a perfect illustration of how a meticulously organised plot could evade the best attempts of the bookies to minimise their exposure.
The 1990s: Multiple sports, multiple platforms
When restrictions were lifted on football betting to unlock a wide range of markets on individual matches, horse racing's dominance as a sports betting medium was challenged for the first time.
At the same time, firms were opening more and more shops, allowing telephone and online accounts while accessing more and more global television feeds.
This was the decade in which odds-compilers really earned their corn for bookies like Coral, Ladbrokes and William Hill – traditional names with presence on the high-street, at the courses and, bit by bit, on rudimentary web browsers too.
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Sports traders and palps
If, for example, you were a graduate with a good degree in maths or economics and you also followed rugby union religiously you could be hired specifically to draw up rugby union markets for one of the big operators.
How Do Betting Odds Work In Vegas
With so much sport to bet on, and so many new avenues from which to glean useful information, this was also the time that 'palps' (bookie slang for palpable errors) were at their most prevalent.
Shrewd punters could sometimes find out if an obscure tennis match or an overseas domestic football game had been rescheduled to an earlier time slot. If the bookies were unaware they could find themselves accepting a bet on an event that had already happened.
How exchanges changed the landscape
The arrival of Betfair into an increasingly cluttered market in 2000 proved a positive intervention in a number of ways, even if some small on-course bookmakers to this day rue the dawn of exchange betting.
Betfair had a huge USP: it was allowing markets to be set by individuals trading on its platforms hours and sometimes days in advance. The prices were not set by individual odds-makers using personal assessment.
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Over the intervening 20 years, the exchanges have had their ups and downs but for bookmakers they provide two major positives which serve as some sort of compensation for draining them of the business they once did.
Firstly, by using the wisdom of the crowd, exchanges establish robust markets relatively quickly meaning betting companies no longer need to invest so heavily in their own odds-makers.
Secondly, the exchanges provide an easy mechanism for bookmakers to lay off worrying liabilities and can even provide early warning of a potential betting coup attempt.
What is BetConnect's role in the market?
BetConnect is a hybrid solution that combines many of the strengths of the Betfair model – it is, after all, a peer-to-peer exchange – alongside the reassurance of big bets being matched without restrictions.
Available prices quoted are based on real-time markets provided by a wide range of online bookmakers. The platform gives bettors reassurance that they are getting the best bookie prices while layers know where to head for matched betting opportunities.
BetConnect's single biggest advantage is its ability to fuse three disparate groups of individuals:
- Professional punters who have grown frustrated by restrictions imposed on them by the bookies
- Recreational players who enjoy backing and laying selections
- The growing community of matched betting enthusiasts
If you think you're ready to bet on horse racing or any other sport then sign up for a BetConnect account now. BetConnect is the only exchange that lets you back selections at bookie odds with no restrictions, and lay the selections of other account-holders commission-free. Not sure how it works? Read this simple guide.