To convert decimal odds to a probability you need to take into account the value of the decimal.
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The William Hill website allows bettors to choose between their preferred odds format, be that decimal or fractional. To work out winnings, you need to multiply the stakes by the odds: 2.00: Bet £3, win £6 (equivalent to 1/1 evens) To calculate the winning percentage when betting with decimal odds, multiply the decimal by 100 to get the percentage. This percentage is not the profit but the amount wagered. For example, a bettor wages £10 with the odds at 1.20. 1.20 * 100 = 120% £10 * 120% = £12 The bettor wins 120% of their original wager back with a successful bet. Odds of 2.00 is the same as a 50% chance of winning.
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William Hill provides unmatched betting odds across sports, television, politics and more. Another format of odds that is popular among punters is decimal odds. Decimal odds use a decimal format to display the stakes and are usually utilised for a quick view of the probability of an event. Decimal odds also make it easier for punters to compare odds without complicated mathematical formulas and allow for a quick view of potential winnings. The higher the number, the higher the potential winnings. Odds above 2.00 has a lower than 50% chance of winning and vice versa.
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To read the betting odds, click on the event you are interested in and take note of the odds listed. They will be fractional, in decimal or American format, each of which will be explained below. Fractional odds use a fractional format to display possibility of an event happening. This is one of the most straightforward ways of determining how much you will win from a bet and is a quick and simple way to understand the probability of an event happening. Here are some examples of fractional bets, how they would work and how much the bookies will pay out for a win.
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3/1 – Bookies pay £3 for every £1 staked 15/2 – Bookies pay £15 for every £2 staked 3/5 – Bookies pay £3 for every £5 staked 1/1 – Bookies pay £1 for every £1 staked The first two bets are called “odds-against” bets: a scenario where the bookie thinks the event is more likely not to happen – the bookie is betting against an event occurring and that it is unlikely. The third one is an “odds-on” bet: a scenario where the bookie thinks the event is likely to happen. When both numbers are the same (last example), this is an “evens” bet: a 50/50 bet. In this scenario you bet free bets new customer no deposit would double your stake if placing a winning bet. Before making a bet, a bettor may want to take into account the profit and their wager to work out the percentage return if they win.
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For example, odds of 3/1 would provide a 300% profit as the payout from the bookie, as well as 100% of the money wagered. If the bettor wagered £10 and won, their profit would be £30 + the bet of £10 = a return of £40. To convert fractional odds to percentages, use the formula (x / y) * 100 with x/y representing the fraction. A bet of £10 with the odds 7/3. Add the wager to the won amount = £33.33 return. To turn decimal odds into probability, use the formula 100/odds.
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For example, if the team’s odds of winning is 6.00, the probability of them winning is 100/6, which equals 16.7%.
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Punters comfortable with exchange betting often use this approach as odds fluctuate more frequently. AceOdds provides the most comprehensive and reliable suite of bet calculators, with over 50,000 bets calculated daily. Trusted by independent bookmakers and punters to work out returns, you can be sure that the calculations are accurate. PL's most negative fanbases Who tops the list? bet365 Edit Bet Feature Use the bet365 Edit Bet feature to amend your bets Monreal on Arsenal's UCL final chances Can they win the big one?
How to convert American odds to Fractional odds?
Welcome to this William Hill guide on betting odds. Here you will learn everything there is to know about betting odds, how to read different configurations, the best ways to utilise your preferred format, and how to convert betting odds. It is essential to understand how betting odds work when preparing to make a bet. A lack of comprehension of the basic fractional or decimal odds could lead to losses by placing a wager you thought was something else. Even bettors that are experienced using one format of odds, fractional, for example, can benefit from understanding the full spectrum of betting odds.
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They may find that utilising multiple formats aids their betting success more than relying on one kind. Betting odds are the odds on a particular outcome and are determined by the bookmaker. For example, England are one of the leading contenders at 6/1 to win the 2026 World Cup. Betting odds are the ratio between the amount staked by the bookies and the bettor, so 6/1 means the bookies stake six times the amount the bettor has wagered. If the bettor wins; their predicted outcome materialises; they will take six times their bet from the bookie (in this case). Always remember that the odds displayed and offered by bookies are always probability based and should never be interpreted as a guarantee that a certain event will happen.
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Use what you have learnt and Check out William Hill’s latest sports betting odds. American odds are also called money line or US odds. These are the odds format primarily used in the US and will rarely get adopted by bookmakers from the United Kingdom. They can be confusing compared to fractional or decimal odds until you have got the hang of them. They are displayed with either a positive or minus number: A positive number indicates how much profit you will get if you bet £100.
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american odds of -300 = -100/-300 = 1/3. Add 1 to the fractional representation e.g. a fractional value of 3/1 = (3/1) + 1 = 4. Positive american odds - The fractional value multiplied by 100 e.g. a fractional odds of 3/1 = (3/1) * 100 = 300.
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Negative american odds - Negative 100 divided by the fractional odds e.g. a fractional value of 1/5 = -100 / (1/5) = -500. Subtract 1 from the decimal representation e.g. a decimal value of 3 = 3 - 1 = 2 which is commonly expressed as 2/1. Positive american odds - (The decimal value minus one) multiplied by 100 e.g.
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Negative american odds - Negative 100 divided by (the decimal odds minus one) e.g. Betting Calculator - Enter your odds and stake to calculate bet returns for all types of sports wagers. Supports all major formats including decimal, fraction and american. Dutching Calculator - Odds changed since you placed your last bet? Use this calculator to determine the stakes necessary to guarantee a fixed return regardless of the outcome. Indicates what you must bet to make £100 profit. Here are some examples of US bets, how they would work and how much the bookies will pay out for a win.
| Region/Country | Status of Odds Comparison | Licensing Required? | Major Restriction |
|---|---|---|---|
| United Kingdom | Fully legal & regulated | Yes (Affiliate License) | Must promote licensed operators only |
| United States (New Jersey) | Legal in regulated states | Varies by state | Must geo-block unregulated states |
| Germany | Legal | No direct license needed | Strict advertising content rules |
| Australia | Legal with restrictions | No | Cannot promote "in-play" betting features |
+250: Bet £100, win £250, profit £350 +250: Bet £10, win £25, profit £35 -125: Bet £125, win £25, profit -£100 -125: Bet £10, win £2, profit -£8 To convert US odds to percentages, use these rules: The odds themselves are the profit therefore the percentage of return is the odds + 100% of the wager.
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When presented with fractional odds, it can sometimes be very easy to determine the probability of an occurrence, but at other times it might not be so simple. Knowing the probability of an outcome can be essential to bettors who are perhaps not as well informed on a certain event, so if you want to put a bet down but would like to understand how likely the outcome is with data and a fixed probability, use the formula (y / (x + y)) * 100 where odds equal x/y. Odds: 3/1 (1 / (3 + 1)) * 100 (1 / 4) * 100 0.25 * 100 25% probability of winning Odds: 7/3 (3 / (7 + 3)) * 100 (3 / 10) * 100 0.3 * 100 30% probability of winning Odds 1/1 (1 / (1 + 1)) * 100 (1 / 2) * 100 0.5 * 100 50% probability of winning which is why odds of 1/1 is called “evens”. It is always worth considering that the odds displayed and offered by bookies are always probability based and can never be made as a guarantee that a certain event will happen. Now that you have a good understanding of fractional odds and probability and are ready to start weighing up individual bets. You can use this to work out how much money will be returned if you win.
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For example, if you were to stake £1 then you would receive £7 back from the bookmaker in this case – £6 profit plus your initial stake. The odds are calculated by the bookmaker. They will estimate the probability of an event taking place and based on their prediction, will display odds. William Hill offers the reader and bettor the opportunity to request their own odds. Through the popular #YourOdds on Twitter, punters can request odds on an outcome not listed by the bookie at the time and be one of the first to place a bet on a specific outcome of their choice.
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The social media team will pass on the punter’s requests to the traders upstairs, and if the request is approved, the punter will be able to bet on their own fully customised odds on the day they requested them before anyone else. You are looking for odds on something you want to bet on? On William Hill’s website, you will find the odds you are looking for and a breakdown of what the odds are for specifically. William Hill offers odds for many different aspects of an individual event. For example, for a football match, you could bet on goals scored, yellow cards, fouls, corners in the first half or bet betting sites that offers sign up bonus the final score.
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Each outcome will have been priced up individually based on the probability of it happening. You will likely come across fractional odds first when looking for betting odds. Fractional odds, for example, show us our potential winnings if we wager the corresponding stake. The number on the left-hand side is your winnings if you were to stake the figure on the right-hand side. For example, with odds of 10/1, £10 would be your winnings if you placed a £1 bet and won. With odds of +250 this equals 250%. If you wager £100, with a successful bet you would profit £250 including the betted £100 equaling 350%. To convert favourites odds to a percentage, use the formula 100 – (10000 / +odds) the bettor bets £100 with -125 odds.
