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п»їHow Do Odds Work in Betting?
If you are planning to start betting, be it casino gambling, sports betting, or any other type, it's important to understand the odds. It would be preposterous and absurd to think about placing bets without having a good grip on the main types of betting odds and the ability to read and interpret the various associated formats.
The three main types of betting odds are fractional (British) odds, decimal (European) odds, and American (moneyline) odds. These are simply different ways of presenting the same thing and hold no difference in terms of payouts. This means that a chance (percentage probability) of an event occurring can be converted and presented in any of the aforementioned types of odds.
How Fractional Odds Work.
Fractional odds (aka British odds, UK odds, or traditional odds) are popular among British and Irish bookies. These are typically written with a “slash (/)” or a “hyphen (-),” e.g. 6/1 or 6-1 and announced as “six-to-one.” Fractional odds are used by some of the world’s largest bookmakers, making them the most preferred odds across the globe.
Therefore, the total (potential) return on a stake can be stated as:
For instance, one of the major sports betting websites listed the following fractional odds for futures betting on the team to win the 2017-18 NBA Championship. Below is a selection of the three teams that had the lowest odds of winning.
Golden State Warriors: 10/11 Houston Rockets: 9/4 Cleveland Cavaliers: 7/1.
It can quickly be determined that the Golden State Warriors are the favorites while the odds on Houston and Cleveland winning are longer. That is, one wins only $10 against every $11 wagered on Golden State to be the champions. Meanwhile, one wins $9 against each $4 (i.e. 3.25 times) put at stake for Houston to win, which is a bit less probable. For Cleveland, one wins $7 against each $1 bet.
In the above example, if you bet $100 on Golden State to win, you could make a $90.91 profit [$100 x (10/11)], and could get back your initial stake of $100, resulting in a total payout of $190.91. However, if you wager $100 on Houston to win, you could receive a profit of $225 [$100 x (9/4)], in addition to the $100 initial stake leading to a total payout of $325. The potential profit for a Cleveland win would be even higher, as you could make a profit of $700 [$100 x (7/1)]. With the initial stake of $100 being returned, it would make for a total payout of $800.
How Decimal Odds Work.
Decimal odds (aka European odds, digital odds, or continental odds) are popular in continental Europe, Australia, New Zealand, and Canada. These are a bit easier to understand and work with. The favorites and underdogs can be spotted instantaneously by looking at the numbers.
The decimal odds number represents the amount one wins for every $1 wagered. For decimal odds, the number represents the total payout, rather than the profit. In other words, your stake is already included in the decimal number (no need to add back your stake), which makes its total payout calculation easier.
The total (potential) return on a stake can be calculated as:
For instance, one of the renowned betting websites priced the candidates to win the 2020 U.S. Presidential Election. Here, we list the decimal odds for the candidates and the biggest long shot among the candidates listed by the bookmaker.
Donald Trump: 4.00 Joe Biden: 1.3.
These numbers merely represent the amount one could win against each $1 put at stake. Therefore, if one bets $100 on Donald Trump to be re-elected as president, this person could make a total payout of $400 ($100 x 4.00). This amount includes the initial stake of $100, giving a net profit of $300.
Similarly, a bettor could make a total payout of $130 ($100 x 1.3) if they successfully bet $100 on Joe Biden. Deducting $100 from this return gives the bettor the net profit earned.
Reviewing the prices that the bookmaker has set for each candidate, it can be determined that according to the bookmaker, the probability of Biden (favorite) winning the election is higher than that for Trump. The higher the total payout (i.e. the higher the decimal odd), the less probable (and riskier) it is for the listed candidate to win.
How American (Moneyline) Odds Work.
Let’s understand this with the help of an example:
One of the popular betting websites priced the NCAA "Sweet 16" men's basketball game between Duke and Syracuse on March 23, 2018, with the following moneyline odds.
In this matchup, there is a big difference between the two odds, indicating a much higher probability of Duke winning the game and advancing to the next round of the NCAA Tournament.
Key Takeaways.
The three main types of betting odds are fractional (British) odds, decimal (European) odds, and American (moneyline) odds. These are simply different ways of presenting the same thing, and hold no difference in terms of payouts. Fractional odds are the ratio of the amount (profit) won to the stake; Decimal odds represent the amount one wins for every $1 wagered; and American odds, depending on the negative or positive sign, either indicate the amount one needs to wager to win $100 or the amount one would win for every $100 staked.
The Bottom Line.
If you are planning to enter the betting or the gambling world, it is important to be able to understand and interpret all types of odds well. Once you have mastered the three popular types of odds (fractional, decimal, and American), you can move towards a more detailed read on this topic and find out how the house always wins. Please refer to Understanding the Math Behind Betting Odds & Gambling for the conversion between the different formats of odds, the conversion of odds into implied probabilities, and the differences between the true chances of an outcome as well as the odds on display.


Betting Odds Explained – A Beginner’s Guide to Gambling.
Betting odds tell you how likely an event is to happen They also tell you how much money you will win However, at first, they may seem confusing and complex Our comprehensive guide takes you step-by-step to explain them.
If you’re new to betting, one of the first things you should do is learn how betting odds work. It’s critically important because it allows you to understand how likely an event is to happen, and what your potential winnings will be. At first, it may appear confusing, however, read our guide and let us explain it to you.
In gambling, odds represent the ratio between the amounts staked by parties to a wager or bet. Thus, odds of 3 to 1 mean the first party (the bookmaker) stakes three times the amount staked by the second party (the bettor).
What is Probability?
The most basic level, betting provides you with the ability to predict the outcome of a certain event, and if your prediction is correct, you will win money. For any given event, there are a certain number of outcomes. Take rolling a dice for instance. If someone rolls a dice, there are six possible outcomes. Therefore, if you bet that the person rolls a ‘one’, there is a 16.67% chance that will happen. What betting odds merely do is present how likely the event is to happen. Bookies most frequently in the UK do this as a fraction, i.e. 4/7, whilst the vast majority also offer the ability to view them as decimals. Again, let us talk you through them. All will become clear.
Using Betting Odds to Calculate Probability.
Whenever you see two numbers separated by a trailing slash, i.e. 10/1, this is known as fractional odds. From this, you can calculate how likely a given event is to happen with a calculation. For ease of explanation, let’s replace the numbers with letters i.e. 4/1 becomes A/B. Here is the calculation: Probability (%) = B / (A+.
Hooray! We’re making progress. Given a fraction, we can now tell how likely (the probability) what we’re going to bet on will happen. Now let’s figure out how much money can be won using betting odds.
Using Betting Odds to Calculate Winnings.
Betting odds allow you to calculate how much money you will win if you make a bet. Let’s use the same examples as before, with the same replacement of numbers for letters, i.e. 4/1 becomes A/B. Quite simply, for every value of B that you bet, you will win A, plus the return of your stake.
9/1 for every ВЈ1 you bet, you will win ВЈ9. 4/1 for every ВЈ1 you bet, you will win ВЈ4. 1/1 for every ВЈ1 you bet, you will win ВЈ1. 1/4 for every ВЈ4 you bet, you will win ВЈ1.
What About Decimals?
Decimals are far more common on exchanges, such as Betfair, but all leading betting sites do give you the option to view betting odds in this format. They are an alternative to seeing betting odds in the fraction format, and in our opinion, are easier to work out. Here is the calculation: winnings = (odds * stake) – stake. Let’s illustrate it with some examples.
9.0 can be calculated as (9.0 * £10 stake) – £10 stake = £80 winnings. 4.0 can be calculated as (4.0 * £10 stake) – £10 stake = £30 winnings. 2.5 can be calculated as (2.5 * £10 stake) – £10 stake = £15 winnings. 1.25 can be calculated as (1.25 * £10 stake) – £10 stake = £2.50 winnings.
You can use our bet calculator to help you calculate winnings. USE BET CALCULATOR.
Decimal Odds Versus Fractional Odds.
In truth, one isn’t better than the other but there is certainly a trend emerging towards decimal odds. Historically fractional odds were used in the UK, especially on racetracks and on the high street. There are two key differences. Generally, decimal odds are easier to understand. Based on this, there has a movement to attract more people to horse racing by making it more accessible to the average punter. Ten years ago, if you were going to Cheltenham, all the odds would be displayed as fractional odds. Now, they’re largely all in decimals. Don’t hesitate to check out our exclusive Premier League Betting Offers !
The second difference between the formats is that fractional odds only represent winnings, and do not include the returned stake compared to decimals which do include the stake. The transition from fractional odds to decimals largely kicked off with the growing popularity of the betting exchanges such Betfair. For odds to change slightly, it’s really difficult to marginally increase or decrease the probability without creating large fractions which are hard to compute for the punter.
Use Our Tool to Convert Betting Odds Into Your Favourite Format.
Our odds converter tool will allow you see odds in whatever format you like . Not only that, but it’ll tell you how likely the selection is to win!
In Summary.
Next steps.
That’s it! Hopefully, that clears up betting odds. You should now have the knowledge to read betting odds, understand how likely it is to happen, and how much you stand to win.
Found this article useful? We have loads more similar ones in our learning section . Here are some popular ones; Find out if using tipsters can improve your chances of winning Each way betting explained Learn what laying a bet means Understand how handicap betting works Our homepage lists all available betting sites for new customers .


How do betting odds work?
Betting odds are used to assess the likelihood of an event happening. Less likely events tend to have higher odds and offer 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.
A quick introduction to betting odds.
Decimal and fraction odds might seem confusing, especially if you’re not familiar with 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 are often seen in sport, 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 ВЈ1 for every ВЈ1 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 ВЈ10 for every ВЈ1 you bet, and therefore your winnings exceed your stake.
A winning ВЈ10 bet at 10/1 odds would result in ВЈ100 winnings plus your ВЈ10 stake, therefore returning ВЈ110 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 ВЈ1 for every ВЈ10 you bet.
Therefore, a winning ВЈ10 bet would result in ВЈ1 in winnings, amounting to a return of ВЈ11 (your ВЈ1 winnings plus your ВЈ10 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 in order to determine your total return.
The best way to calculate your returns from fractional odds is to follow a formula:
This might look complicated, but we promise it will make sense when you plug your numbers in.
For example: If you bet ВЈ10 on a 5/2 bet, your calculation would look like:
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 ВЈ10 on odds of 5/1, then your return would be ВЈ60. However, if you were to stake ВЈ10 on odds of 1/5, your return would only be ВЈ12.
Understanding moneyline odds.
The moneyline shows you how much you have to bet in order to win ВЈ100.
If you are presented odds of -200 (because this event is more likely) you will have to stake ВЈ200 to return ВЈ300 (your ВЈ200 stake plus ВЈ100 winnings).
In order to calculate the potential payout from a moneyline bet, simply follow this formula.
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.
As well as finding out how much your bet will potentially return, the calculator also gives you the total profit.


Betting Odds Calculator.
The betting odds calculator allows you to input your stake & odds in American, Decimal, or Fractional formats to quickly calculate the payout for your bets.
Top Offers.
American Odds are the default odds at American sportsbooks. These odds are based on winning $100 for a given bet.
Betting a Favorite: The odds for favorites will have a minus (-) sign , and represent the money you need to risk to win $100 .
So if you're betting on the Packers at -140 against the Vikings, that means Green Bay is a slight favorite. You need to risk $140 to win $100 on the Packers. If they win, you profit $100 and get your original $140 back.
The rest of the world uses Decimal Odds , in part because it’s easier to convert them to implied probabilities than American Odds. Decimal odds represent the amount a bettor wins for every $1 wagered . And the number represents the total return , not just the profit like American and fractional odds.
The Packers would be 1.714 in decimal odds as a -140 favorite in American odds. For every $1 risked, you’re profiting 71.4 cents, plus your $1 back.
Fractional Odds are used primarily in the UK and Ireland. Few bettors use fractional odds for betting sports (other than horse racing), because the conversions to understand return are difficult.
To calculate winnings on fractional odds, multiply your bet by the top number (numerator), then divide the result by the bottom (denominator). So a $10 bet at 5/2 odds is (10 * 5) / 2, which equals $25. A $10 bet at 2/5 odds is (10 * 2) / 5, which is $4.
Did you notice those percentages add up to more than 100%? That’s because of the vig, which is a sportsbook’s cut for facilitating your bet. To calculate implied probability, use the following formulas:
For negative numbers (favorites), drop the minus sign, then do:
For positive numbers (underdogs) :
The bet amount is how much you’re risking on a given bet. As a responsible bettor, it is important to understand proper bankroll management.
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How to Calculate Odds.
Last Updated: February 1, 2021 References.
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The mathematical concept of odds is related to, yet distinct from the concept of probability. In simplest terms, odds are a way of expressing the relationship between the number of favorable outcomes in a given situation versus the number of unfavorable outcomes. Usually, this is expressed as a ratio (like 1 : 3 or 1/3 ). Calculating odds is central to the strategy of many games of chance, like roulette, horse racing and poker. Whether you're a high-roller or simply a curious newcomer, learning how to calculate odds can make games of chance a more enjoyable (and profitable!) activity.
David Jia Academic Tutor Expert Interview. 14 January 2021. Let's say we bet that we'll roll either a one or a two. In this case, there's two possibilities where we win - if the dice shows a two, we win, and if the dice shows a one, we also win. Thus, there are two favorable outcomes.
David Jia Academic Tutor Expert Interview. 14 January 2021. In the example with the die, if we bet that we'll roll either a one or a two, that means we'll lose if we roll a three, four, five, or six. Since there are four ways that we can lose, that means that there are four unfavorable outcomes. Another way to think of this is as the Number of total outcomes minus the number of favorable outcomes. When rolling a die, there are a total of six possible outcomes - one for each number on the die. In our example, then, we would subtract two (the number of desired outcomes) from six. 6 - 2 = 4 unfavorable outcomes. Similarly, you may subtract the number of unfavorable outcomes from the total number of outcomes to find the number of favorable outcomes.
David Jia Academic Tutor Expert Interview. 14 January 2021. You may choose to represent this ratio as a fraction. In this case, our odds are 2/4 , simplified as 1/2. Note - 1/2 odds don't mean we have a one-half (50%) chance of winning. In fact, we have a one-third chance of winning. Remember when expressing odds that odds are a ratio of favorable outcomes to unfavorable outcomes - not a numerical measurement of how likely we are to win.




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