Outsmart the Bookmakers.

Our expertise also extends to finding the best bonus codes and sign up promotions with the occasional tip-off from our shrewd user base.Learn More. Bet £10 Get £30 in Free Bets The William Hill Sport promo code to claim this offer is available by clicking link 👉 New UK customers only, registering with promo code R30.

Betting Site Bonuses and Welcome Offers Explained

You multiply your stake by the odds to get your total returns. So, if you bet £1 on England to win the World Cup at odds of 10.00, you’ll get £10 back, which includes your £1 stake. The main benefit of decimal odds is that they are much easier to compare at a glance. Take decimal odds of 3.75 and 3.60; it’s clear that 3.75 gives a higher return. But which offers the higher return out of 11/4 and 13/5?

📲 How do I include an odds bonus boost in my calculations?

As such, professional bettors vastly prefer decimal odds. Betting exchanges display their odds in decimal form, whereas online bookmakers favour fractional odds by default. You can change to decimal odds on your bookmaker settings page for ease of comparison. Moneyline odds (AKA American odds) are shown as positive and negative numbers. A positive value of +500 says you’ll win $500 for every $100 staked. Make your first deposit of £10+, then place a £10 single bet from main balance at odds of 1/2+ on any sports market (excluding Virtuals).

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Get £30 in Free Bets (3x£10) after settlement. Free Bets valid on any sports market excl. Virtuals, expire in 7 days, non-withdrawable and must be used in full (£10 each). Deposits via PayPal, Neosurf, Paysafe, Apple Pay, NETELLER, Skrill, ecoPayz, Kalibra/Postpay and WH PLUS Card excluded. Bet 5p Get £30 in Free Bets No Sky Bet Sport promo code is required to claim this bonus Free bet stakes not included in returns. Eligibility restrictions and further T&Cs apply.

• BestOdds: Simple, clean interface focusing on US sportsbooks and legal states
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Common Questions

The structural edge held by all bookmakers comes from the margin built into their odds, which means the combined implied probability of all outcomes on a market exceeds one hundred percent. This built-in margin varies between platforms and between market types, which is why comparing odds across multiple bookmakers before placing each bet is the most effective way to maximise value over time. The odds converter instantly converts fractional, decimal and moneyline odds into your chosen format and gives you the implied probability of the event occurring. For more information on betting odds and how they work, please see my Betting Odds Explained guide. These are the odds traditionally used by bookmakers and show you how much you win relative to your stake.

The OddsGuard Way

The number on the left is how much you win based on staking the amount on the right. For example, fractional odds of 9/1 show that you stand to win £9 for every £1 staked. With fractional odds, you also get your original stake back. In the 9/1 example, you win £9 plus your original £1 stake you handed over to the bookmaker for a total return of £10. Decimal odds show how much a winning bet will return, including your stake. £50 in Bet Builder Bets when you stake £10 on Football The Paddy Power Sport promo code to claim this offer is YSKASP Place a min £10 bet on Football on odds of min 1.5 (1/2), get £50 in Free Bet Builders after the qualifying bet has been settled. Only deposits via Pay by Bank, cards & Apple Pay will qualify. Bet £10 Get £30 in Free Bets No Unibet Sport promo code is required to claim this bonus Deposit and Bet £10+ on sports at min odds of 2.0+ (1/1) for £30 in Free Bets within 7 days. Debit cards or instant bank transfers only. Free bets expire within 7 days of issue. Geographical restrictions and T&C’s apply. Bet £10 Get £40 + 25% Bet Builder Boost No BOYLE Sports Sport promo code is required to claim this bonus Free bet applied on 1st settlement of any qualifying bet. Cashed out/Free Bets won’t apply.

What Our Users Say

Yes, there are numerous ways to make the odds work in your favour to win more from bookmakers than you lose. One of the most popular is a tried and tested technique bet best bet builder for today called matched betting. When bookmakers offer a free bet or promotion, they effectively put the odds in your favour and allow you to make money from them in the hope that you will keep betting and lose money in the long term. When a bookmaker offers a free bet, you can cover all outcomes of an event to claim the free bet for an overall loss of just pennies. You then have a free bet to use.

Secure & Anonymous

You can either hope this wins or repeat the process of covering all outcomes to extract about 80% of the free bet amount. You can make about £16 profit from a £20 free bet, no matter the outcome of your bets. Bookmakers know this opportunity exists but continue to offer free bets and promotions as they know most people will bet casually and go on to lose money. My comprehensive and free Matched Betting Guide will take you through the basic concept with a complete walkthrough of your first bookmaker promotion. You’ll even earn about £15 in the process. 1 Free Bet offer per customer, household & IP Address only. Available on one bet per selected event. Boost will be added once all selections have settled.

How do you calculate fractional odds?

Beyond that, my Matched Betting Academy details how to profit from every UK bookmaker’s ‘welcome’ offer, all for free. Designed and tested by matched betting experts, it also provides techniques to make money from extra place offers, 2UPs, price boosts, and other recurring existing customer offers, all logically structured and well-paced. 18+ Wagering and T&Cs apply Play Responsibly Commercial Content 18+ Wagering and T&Cs apply Play Responsibly Commercial Content Bet Calculator - Supports all bet types and options. Accumulator Calculator - Work out your acca by combining multiple selections into a single wager. Lucky 15 Calculator - Calculate your bet sports betting promos sign up 4-selection wager of 4 singles, 6 doubles, 4 trebles and 4-fold acca.

🧃What’s the difference between vig and juice?

Dutching Calculator - Find the stake needed on each of your bets to guarantee a fixed profit. Odds Converter - Convert to and from: decimals, fractions, american and implied probability percentages. bet365 Live Streaming Schedule - Watch live sport, including football and horse racing. Check out the latest promo codes and offers from established and new betting sites including bet365, Sky Bet, Coral, Paddy Power, Betfred, BetMGM, Midnite, Dabble and more. AceOdds provides the most comprehensive and reliable suite of bet calculators. Offer does not apply to multiple bets. Free/void/cashed out bets won’t qualify. Get Up to £40 in Football Free Bets No talkSPORT BET Sport promo code is required to claim this bonus Opt in and bet up to £40 (min. £20) via mobile or app on any football (odds 1/1+) within 7 days of registration. Get up to £40 in bet football betting app download free bets on selected markets, which expire in 7 days. Bet £10 Get £50 in Free Bets on ACCAS, Bet Builders or Multis The Betfair Sport promo code to claim this offer is ZSKAOL T&Cs: Place a min £10 bet on Sportsbook on odds of min EVS (2.0), get 5x £10 in Free Bet Builders, Accumulators or multiples to use on any sport. Only deposits via Pay by Bank, Apple Pay or Debit Card will qualify. Submission Deadline: 24th May at 16:00pm Author: AceOdds.com 21 May 2026 Pick 6 winners to win a share of £250,000 Author: AceOdds.com 10 April 2026 The higher the finish, the more you win! If your player gets subbed, your bet plays on Author: AceOdds.com 18 May 2026 2.5%-100% Bonus on your Acca winnings Author: AceOdds.com 19 May 2026 Get early payouts on your bets if your team takes the lead with the bet365 Early Payout offer.

The AceOdds Bet Calculator makes betting simple. Our fully-featured betting calculator allows you to calculate the stake, betting odds, return and payout for any bet combination.

• Use filters to compare odds for specific bet types like moneyline, spread, or totals
• Sort odds tables by bookmaker, percentage, or best price available
• Check for available sign-up offers and promotions linked to the best odds
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• Access direct links to bookmaker sites for quick placement of bets

Maybe it’s a Yankee, Accumulator, Lucky 15 or even the humble Single - our custom designed Bet Calculator has you covered for what ever bet you have in mind. Have odds changed since you placed your last bet? Our Dutching Calculator helps you work out how much to stake on each selection to guarantee a fixed return, regardless of the outcome.

William Hill mobile app: User experience, live streaming & ratings

A negative value of -200 says you must stake $200 to win $100. Like fractional odds, they do not include your stake, so add this back at the end. For example, +800 gives $800 back from a $100 stake. Adding your original $100 stake gives a total return of $900. Implied probability is the conversion of betting odds into a percentage.

Using odds calculators

It gives you a rough idea of how likely something is to happen. The actual probability of an outcome happening is usually slightly less than the implied probability, as betting odds factor in the bookmaker’s margin. Bookmakers offer odds that they believe are lower than the actual chances of something happening, which is how they make their money over the long term. A quick reference chart featuring all the traditional odds used by bookmakers. * Decimal odds are shown to two decimal places but are not rounded, as this is how they appear on a bookmaker’s site. AceOdds calculators are designed for speed and flexibility to help provide the clarity you need to maximize your winnings. Customize your experience with these key features: Switch Odds Formats: Easily toggle between fraction, decimal, or American odds via the settings. Advanced Options: Configure complex wagers, including advanced each-way bets, with auto-save functionality. Simple Entry & Tips: Input stakes and odds quickly, using built-in tooltips for on-the-spot guidance.

• Oddschecker: Comprehensive coverage of sportsbooks with real-time odds across major sports
• BetBrain: Aggregates odds from hundreds of bookmakers and betting exchanges
• OddsPortal: Features detailed odds history and line movement charts
• BettingExpert: Focus on value betting with tools to identify statistical discrepancies

Save & Share: Generate a unique link to save your bet slip or share your selections via social media with a single click. Check our betting glossary for help with terms, and then explore the best welcome offers and promo codes from trusted bookmakers to kickstart your account with free bets. Our team of experts have over 30 years of experience between them testing all the established and new betting sites and have found £2000+ worth of bonuses from 45+ bookmakers. We have researched and analysed all the major players conducting in-depth reviews to help you decide which bookie is right for you.