Betting Margins Explained

March 26, 2017

The ever-expanding world of online betting offers endless opportunity for bettors to handpick the best odds and bets from a wide array of offers.

Many bookmakers will claim to have the best-valued odds, but the burning question every tipster and punter is keeping their minds on is whether they will truly get the best deal for their money.

All of those who want to remain on top of things and always make sure they get the best odds possible need to make sure they understand how betting margins work.

What betting sites and bookies in general will do is adjusting the odds in order to attract bets from as many bettors as they can with a simple aim of securing a profit whatever the outcome may be.

The way they do this is by offering odds that often exceed the statistical probability of a chosen event, making sure they secure what is called a bookmaker’s margin. It is usually represented as the betting over-round or the market percentage with amounts over 100% and it is that difference between the actual value and the marketing value of a particular product – in this specific case a bet.

How do you calculate a betting margin?

If we are to bet on a match between Novak Djokovic and Andy Murray with Djokovic available at the betting odds of 1.65 and Murray standing at 2.35, the betting margin for this particular game will be:

(1/1)*100 + (1/2.35)*100 = 60.6 + 42.55 = 103.15%

This is close to 100%, so punters are getting a good deal, but the bookmaker has put in a 3.15% margin here, so if they have an even book, with the same amount of money placed on each player, their profit is 3.15% of the market.


Best 10 New Bookmakers

£20 SIGN UP HERE

New customers only. Strictly 18+ begambleaware.org. Minimum deposit £20. Place any sportsbook bet at minimum odds of 2.0 (1/1) to receive your free £20 welcome bonus.

£20 SIGN UP HERE

18+, UK only. Deposit and place a £10 cash bet at single or accumulated odds of 1/1 . First cash bet only. Free bets as 4 x £5 bets on Football, Horse Racing & Virtual. Cashed out, Void or 'Draw No Bet' wagers do not qualify for this promotion.7-day free bet expiry. Full T&Cs apply.

£15 SIGN UP HERE

18+,New customers only. Min wagering on sport £10. Max one £15 free bet. Qualifying bets must be placed at odds of 1/1 or greater. Paid as bonus token with min 4/5 odds req. Selected payment methods only. Bet expires after 14 days of being credited. Click to see full T&Cs

£10 SIGN UP HERE

18+, New Players only, 1st Deposit, Min Deposit,: £10, max £10 free bet valid for 14 days, with odds of 1/1 or greater and be settled within 14 days of placement. System bets not eligible. Neteller,Skrill and Paypal not eligible. T&Cs apply

£10 SIGN UP HERE

New customers & 18+. Min. dep of £10. Bet of £10 with min odds of 1.5 required. Valid for 7 days. If your selection loses, the free bet will be added to your account. Full terms and conditions apply.

£50 SIGN UP HERE

New players only. 100% up to £50 sports bonus. Rollover: 17x deposit & bonus at minimum odds 2.00 within 365 days. If bonus is cancelled, bonus funds will be lost. T&Cs apply. 18+, begambleaware.org

£30 SIGN UP HERE



Place a £10 fixed odds bet at minimum odds of ½, Get £30, Get 2 x £10 free fixed odds bets + 2 x £5 free Total Goals spread bets. Full Terms Apply



£30 SIGN UP HERE

Opt-In, bet £5 (odds 2.00+) Valid x 7 days. 3 x £10 Free Bets for set events (odds 2.00+) Card payments only. Additional terms for existing BetVictor customers apply, T&Cs Apply. 18+ begambleaware.org | Please gamble responsibly

£10 SIGN UP HERE

18+, New Players Only. | Opt-In Required. | Valid on first Sports bet | Min. dep. £10 req. | Min. £10 wag. Odds of 1/1 | Bonus Wag. req.1x on min. 2-fold Acca bets (min. 1/4 odds each selection) with min. final odds of 1/ 1| Virtual and cashed out bets do not qualify | T&Cs apply | BeGambleAware.org

£25 SIGN UP HERE

Deposit and bet on any Sportsbook Markets of your choice at odds of Evens (2.00) or greater. Get 50% Back of your first days' losses as a Free Bet up to £25 + a Guaranteed £5 Free Bet Either Way plus 50 Free Spins! 18+