Dropping Odds

A -200 means you need to bet £200 to win £100.

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If your bet wins bet bookmakers online uk your return would be £300 (£200 stake plus £100 winnings). A +300 means you have to bet £100 to win £300.

Best Basketball Odds

If you’re having trouble calculating your bet, try our free bet calculator. Since 2000, TxODDS has been streaming fast, reliable odds to every corner of the world. Global teams, 24/7 support, zero tolerance for downtime. At 8-10ms, your feeds update before the market moves. That speed translates directly into margin your competitors leave behind.

American pro sports

Consensus pricing from multiple sources closes the spread before it can be exploited. Your book stays balanced without manual intervention. Scout-verified, blockchain-confirmed results mean zero ambiguity at settlement. When a result is on-chain, there is nothing left to dispute. See where the TxODDS team has been meeting with trading teams, operators, and product leads at industry conferences and events. If your bet wins the return would be £400 (£100 stake plus £300 winnings). Here is a handy resource for comparing and converting odds between the fractional and decimal betting formats: Odds on simply means an event is more likely to happen than not.

It is the opposition of odds against. Any odds-on price carries an implied probability higher than 50%. Any odds-against price has an implied probability below 50%. A bet of exactly evens has an implied probability of 50%, and your winnings will be equal to your stake. In fractional odds, an odds-on wager will see the smaller number on the left than the right. This is flipped for odds-against bets. For instance, 4/6 is an odds-on price with an implied probability of 60%. Flip those odds to 6/4 and the implied probability drops to 40%.

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When it comes to payouts, an odds-on bet simply means you will win less than you staked.

• OddsSniper - known for speed and comprehensive coverage
• Oddschecker - popular platform with a large user base
• BetBrain - focuses on European and Asian markets
• LiveScore Bet - integrated with live scores and stats

An odds-against wager means you will have larger potential winnings than you stake.

So if you placed £4 on England to beat France at 6/4, you would win £10 if the Three Lions were victorious. Learn how to use this calculator to profit from bookmaker promotions in my complete matched betting guide.

Ladbrokes Best Odds

The number on the right is the unit stake. The number on the left represents the potential winnings if you were to place that stake. In the case of a 4/1 bet, your bet is £1 and if it is successful you will win £4. The total return on this bet would therefore be £5 (initial £1 stake plus £4 winnings). The probability of a 4/1 chance winning is 20% - based on his calculation 1 / (4 + 1) = 0.20 It is a matter of preference whether a bettor prefers decimal odds.

What does matched betting mean?

As you might have guessed, these are demonstrated with a number given to two decimal places. The calculation for decimal odds is as follows: Decimal odds are written as 9.0 (which is the equivalent of 8/1 in fractional odds). When you see decimal odds displayed, remember that these include your unit stake of one. If you bet £1 at 9.0 and your bet wins, you will get back £9 (initial £1 stake plus £8 winnings). The probability of a 9.0 chance winning is 10% - based on this calculation 1 / (9 + 1) = 0.10 American odds are perhaps the most complicated. This calculator takes the manual work out of matched betting by calculating the stake you must place at the betting exchange (your lay stake) to get as close to breakeven as possible on your qualifying bets. It also maximises profit when placing your free bets. The amount you need in your exchange account (liquidity) should your back bet win. The distribution of your money between your bookmaker and exchange accounts in the event of each outcome. Your potential profit from a free bet at the current odds. How adjusting odds and stakes can impact your overall profit or loss. How you can underlay or overlay – weighing your profit in favour of a particular outcome. How to handle part lays – where you have already placed one or more lay bets but not to the total required to give an even profit between outcomes.

Integrated With 41+ Sportsbooks

It is possible to calculate the implied probability of an outcome using the betting odds published by a bookmaker. Bookies calculate the chance of an event happening to help them work out their odds. An outcome at short odds will carry a higher implied probability, meaning it is much more likely to happen. Longer odds make an event less likely. In fractional odds, for instance, an event at 5/4 is far more likely than an event at 9/2.

2. Instantly Understand the Odds

There are surprises at all levels of sport. Just because a horse is heavily favoured to win a race, there’s no guarantee it will do so. The same goes for every sport – the challenge with predicting the outcome of sports betting markets is part of the reason online sports gambling has become so popular. Bookmakers will use fractional, decimal, or American odds to display the implied probability of an outcome. Fractional odds are presented with a slash between two numbers. This calculator is for making a profit from a range of offer types, the most common being ‘Bet X, Get Y’. I recommend working through my Matched Betting Guide so you can fully understand the matched betting process and its use. Depending on your stage when profiting from a bookmaker promotion, the calculator has a few different modes. Use this mode when placing your initial bets to claim your free bet, risk-free bet or bonus. Input the stake and odds from your selected market at the bookmaker (back bet), along with your odds and commission at the exchange (lay bet), and it will show you the amount you need to stake at the exchange (lay stake) to make the minimal loss.

Use this mode when turning your free bet into a profit. It works for free bets and bonuses (A bonus is a free bet that needs to be ‘rolled over’ a set number of times before you can withdraw it. For example, a bonus with a three times rollover requirement means you must wager it three times before you are allowed to withdraw it as cash). For bonuses, you must bet until you either meet the rollover requirement or lose at the bookmaker and win at the exchange. My Bonus Rollover Guide gives full details. Again, input your stakes, odds and commission to get your lay stake.

Events & Webinars

We ask questions, listen closely, and build from what we learn because every improvement starts with a conversation. Bookies use betting odds to show the likelihood of a given outcome. This could be the chance of a team winning a match or a player winning an award. Whether you’re analysing outright markets or live betting, it’s imperative you understand what odds are showing you. Along with the implied probability of the odds, they also indicate the potential returns from a given wager.

Odds On

Here are some of the key terms to note before starting to bet: Stake – this is the amount you decide to wager on your bet. Stake – this is the amount you decide to wager on your bet. Odds – this is the ‘price’ you agree to stake your bet at. Payout – this shows the expected return on your bet, if you are successful Payout – this shows the expected return on your bet, if you are successful A probability is the likelihood of a certain outcome. Betting odds aim to show the probability of a given outcome in a selected sporting event – this can be everything from Joe Root scoring a 50 to Harry Kane scoring two goals in a match. Some bookmaker promotions will return your initial stake (the ‘free’ one they give you), although most will not. If the promotion terms say your stake will be returned, check ‘Stake returned’ to adjust the calculations accordingly. Some promotions will give you money back if your bet loses. Select this mode to factor in the cashback amount from losing bets. The calculator uses Smarkets colours (green for back, blue for lay) by default. For Betfair colours (blue for back, pink for lay), you can switch in the main website navigation – under the palette icon on non-mobile devices. Use part lays when you have already placed part of your lay bet at the exchange, but more is needed to give an equal profit on every outcome. This instance could arise if you made a mistake with your first lay bet.

How sports betting odds are calculated in 2026

A number is given with a plus or minus in front of it. Wagers are odds-on if they have a minus, such as -200 or -500. Anything with a plus, like +500, is odds against. The calculation is based off £100 as the stake. Unlike the presentation of fractional odds, this does not change. Enter the part lays you have already placed, and the calculator will give the lay stake required to equalise the profit on all outcomes. Use the slider to weigh your profit towards a win at the bookmaker or the exchange. Doing so can give a higher profit on particular outcomes, which you may want to do to keep things exciting, or if you wish to retain a higher portion of your bonus when completing rollover requirements. My Bonus Rollover Guide has full details. Click the ‘underlay‘ or ‘overlay‘ headings to set the slider to a position where your bets will result in a reduced profit on either the bookmaker or exchange side and a higher profit on the opposing side. My Reload Offers page contains details of every profitable bookmaker promotion currently available.

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Filter by ‘Bet X, Get X’, ‘Bet X, Get X if…’, ‘Free Bet’ or ‘Risk-Free Bet’ offer types for offers you can do using this calculator. The calculator at the top of the page does all these calculations for you (and more!). However, if you’re curious or need to know how to calculate lay stakes for matched bets manually, here are the formulas. These formulas give an even profit no matter the outcome of your bets. Lay stake for qualifying betLay stake = (back odds * back stake) / (lay odds – lay commission) Lay stake for free bet if stake not returnedLay stake = (back odds – 1) / (lay odds – lay commission) * free bet value Lay stake for free bet if stake returnedLay stake = (back odds * free bet value) / (lay odds – lay commission) Matched betting is a way of exploiting bookmaker promotions to make a predictable profit from each one. By covering all outcomes of an event, you can meet the requirements for claiming free bets or bonuses while your bets cancel out, resulting in an overall profit or loss close to breakeven.