MAXIMIZE YOUREDGE.

Install the extension and complete every step to unlock the full OddsGuard experience. The days of paying $600 a month for clunky dashboards are over. Open your favorite sportsbook, spot the mathematical edge highlighted right on your screen, and lock in your bet before the line moves.

What is the difference between a bet builder and an Acca?

A 9/2 price in decimals is 5.50 and in moneyline it’s +450. 6/5 is a slightly bigger price than even bet new betting offers today money (1/1) and is expressed as 2.20 in decimal format or +120 in American format. If you placed a £10 bet on a 6/5 selection you would get a return of £22 (£12 profit) on a winning bet. 2/7 is an odds against price, meaning there is quite a high probability of winning according to the bookmaker and if ti wins you are going to make a much smaller profit. A successful £10 bet at 2/7 returns £2.86 on top of the stake, so total returns of £12.86.

OddsChecker – Localisation for specific regions

This a 1.286 decimal odds price or -350 in American format. The most popular format outside the UK and Ireland, prices in decimals tell you what you stand to win if your bet is a successful one, including the stake being returned to you. Sometimes decimal prices are quoted to three decimal places, so if you place a £10 stake at 4.755 your total return on a correct bet is exactly £47.55, meaning you made a £37.55 profit. Although it takes a while to adjust from thinking in fractional odds to decimals they are becoming increasingly popular as they are easy to understand and accurately convey to the punter the exact return they stand to walk away with if their selection comes in. Decimal odds are also frequently used on betting exchanges.

Top 5 bookmakers with rich bonuses

Follow the patterns of typical decimals odds such as 4.00 (3/1 or +300), 4.50 (7/2 or +350), 5.00 (4/1 or +400), 5.50 (9/2 or +450) and 6.00 (5/1 or +500) and you soon get a feel for how they translate into fractional or moneyline prices. When using decimal odds, you simply multiply your stake by the decimal odds and you will know exactly the return of a winning bet. As you might guess from the name this format is most popular in North America. Again, if the moneyline figure is positive it tells you what you can win on a successful bet with a £100 stake. Remember though, -100 is evens, so your returns are exactly double what you put down. Lock in bets before the line moves You no longer have to frantically refresh tabs or cross-reference screens just to find closing line value. OddsGuard gives you the sharpest insights without the heavy lifting — and without the monthly bill. Get the Browser Extension or Desktop App (that connects through your browser) OddsGuard works directly inside the sportsbooks you already use.

• Calculates and displays implied probability for each odds set
• Shows the "sharp" bookmaker's line for each market
• Identifies arbitrage opportunities across different sportsbooks
• Tracks line movement history with graphical charts
• Alerts for positive expected value (EV) bets based on model projections

No extra tabs, no manual lookups — just smarter betting.

Understanding Odds

We will cover implied probability at the bottom of this page. The table below gives you some common prices in the three formats. In the UK and Ireland, fractional odds are by far the most familiar and common. These odds are displayed as 1/2, 1/1 (evens), 2/1, 100/1 and so on. For European bookmakers, the most common format is decimal, where a price such as 3.00 represents the equivalent of the 2/1 fractional price.

The OddsGuard Way

In decimal prices the returned stake in a successful bet is ‘built into’ the odds. Meanwhile, in America, in the moneyline format if the figure quoted is positive it expresses the profit you would make from a successful bet with a $100 stake, so +200 means $200 in winnings on top of the returned $100 stake. A +200 moneyline price is therefore the same as the fractional 2/1 odds, or 3.00 in decimals. With origins in horse racing, fractional odds are by far the most dominant format to express prices in the UK & Ireland. However decimal odds are becoming more popular with new bettors as they are easier to understand for those new to the environment.

🎯 How accurate are the odds conversions?

Fractions are easy to understand once you are used to them, with the most confusing fractional prices those closer to even money.Fractional odds express the profit the bettor will make against their stake, if their bet is correct. So with a 3/1 price if a punter puts down a £10 stake the potential profit is £30 (£10 x 3) and the total that would be returned is £40 (£30 profit plus the £10 returned stake). The same 3/1 price in decimal format would be 4.00 and in the American / moneyline format it would be +300. When you see prices such as 9/2, 6/5 or 2/7 it can take a bit longer to understand your returns compared to odds that are 'to one' (e.g., x/1). With a £10 stake in a successful bet at a price of 9/2 the returns would be £55, a £45 profit plus the £10 stake back. OddsGuard also overlays on Oddschecker, OddsShark, and VegasInsider — so you can spot the better price right where you already compare lines. Our browser extension shows you when better odds are available at other sports providers right on the pricing page. Click through the tabs bet get bonus bets when you sign up to see it in action. 14 5-star reviews from bettors using OddsGuard today. Every active promo from every sportsbook — deposit bonuses, free bets, odds boosts — organized in one tab inside OddsGuard. OddsGuard provides everything you need to make informed decisions and save time and money.

Compare prices across major providers in real-time to find the best value for your selections. Extension only loads on supported sports platform websites, so you don't have to worry about your data being shared with third parties. Automatically find and compare the best prices across 75 major providers so you don't overpay. Stay in control and keep your data anonymous. OddsGuard runs silently in your browser, automatically detecting relevant sites and prices without disrupting your browsing. Set your minimum savings thresholds for when to show better pricing. Show 👍 icon when the best prices are found.

• 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

OddsGuard is geolocated to your market, so you only see prices for providers that are available in your region.

How to calculate Implied Probability from Decimal Odds

See +EV alerts, find better lines, save money — automatically. OddsGuard works best in Extension mode — enable it once and we'll overlay the best price across 75+ sportsbooks on every page. Once the extension is on, OddsGuard stamps a live savings badge on every odds button — you'll see better prices before you tap. Don't leave money on the table — we scan every major sportsbook in real-time and route your parlay to the book paying out the most. One feed for every signup boost, deposit match, and reload offer across the books — claim them before they expire. Instantly convert between decimal, fractional, and American price formats with a single click. The same 4-leg parlay can pay $10,000s more at a different sportsbook. OddsGuard finds the best price across 75 books in real time — replacing tools that charge $200–$600/month. If you’re already using a sports betting system as a regular, simple and comfortable way of earning money to supplement your existing income, or if sports betting has already allowed you to give up your 9 ’til 5 job and your own personal system is consistently delivering, then there’s no need for you to read on any further. If not, and if you have a genuine desire to at least secure an additional income with the very real prospect of securing a main income stream, then read on.

Bigger Wins Are EASY

A £100 bet at a price of -100 returns £200, or £100 profit. With any negative moneyline figure beyond -100 the price is odds against and you stand to make less profit than the stake amount. With -105 moneyline (decimal 1.952 / fractional 20/21) odds your successful bet with a £100 stake win you £95.20 and so you walk away with £195.20 returns. With a -500 price (1.20 decimal or 1/5 fractional) your successful bet with a £100 stake gives you a £20 profit, so £120 total returns. Also, to note, sometimes you will hear prices or odds in North America referred to as ‘lines’.

Bet calculator description

Punters usually only find themselves in situations where they are trying to convert odds between formats, for example whilst on holiday or traveling and betting outside their home countries. It is useful to be able to do, if you don’t have a conversion table or tool to hand. Converting decimal odds to fractional, take the decimal and subtract 1.00, so 5.00 – 1.00 = 4/1. However, if the decmial odds do not end in .00 then you will have to multiply the fraction to reach a non-decimal one. For example, 4.50 - 1.00 = 3.5/1, multiplied out to be 7/2 which is a normal odds presentation.

What is a double bet?

For converting moneyline to decimal, when the moneyline price is positive divide it by 100 and add 1. Or for example, 5000 ÷ 100 + 1 = 51.00. When the moneyline price is negative, take 100 and divide it by the moneyline amount (first removing the minus sign), and add 1. So for a -400 price it would be 100 ÷ 400 + bet online betting bonus offers 1 = 1.25. For conversion of fractional odds to decimal take the first figure and divide it by the second figure then add 1.00. Our system is totally transparent and has a proven betting success percentage of 94.4%.

Odds comparison - Tips on how to make the most of your bets

So 1/2 becomes (1 ÷ 2) + 1.00 = 1.50. Or 2/1 becomes (2 ÷ 1) + 1.00 = 3.00. The concept of implied probability is worth keeping in mind when you try to assess the value of odds from a bookmaker. The odds are set based on the implied probability of the outcome, such as a horse winning a race, or a football player scoring a goal. A 9/1 (10.00 or +900) bet is ‘expected’ to be successful once in every 10 occasions, so the probability would be 10%.

Example 2:

A 1/4 (1.25 or -400) bet would be expected to be successful in four of every five attempts, it is heavily ‘odds on’ and the implied probability is 80%. You can make these types of calculation to assess the % chance you think your selection has of achieving the result you are betting on and see if you feel the odds are giving you enough value to make the bet. The No.1 place for Sports Betting Insight, Data & Content. Follow & track your favourite horses, jockeys & trainers Browse our catalogue of sports free bets and betting offers. OddsGuard overlays real-time prices from 75+ sportsbooks directly on the page you're already on. This is archived and available for all site visitors to view for free. Our historic predictions and associated outcomes and rate of success are all evidenced so please take a look at the Archive of football tips.