Best Bookie Sites 2026: What Each Licensed Operator Actually Costs a Punter

Updated October 2026

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A bookmaker serving customers in Great Britain needs a Gambling Commission licence. That licence, not a marketing budget, is what tells a punter whose terms they are actually betting on. The Commission’s public register lists every brand legally permitted to take bets in this country, and the ten operators reviewed below are all on it. They differ in price, in the welcome offers they advertise and in the friction they add to withdrawing winnings. The pages that follow look at each of those differences in plain language, because the headline price next to its own market margin is what a bet actually costs.

Data current as of 27 October 2026 and verified against the Gambling Commission’s public register of remote operating licences.

Bonuses and Free Bets

A bookmaker’s welcome offer is a marketing line, not a gift. The number on the landing page (“Bet £10, Get £30”) tells the punter how much the operator wants them to deposit, not what they walk away with. Three things decide whether an offer is worth the trouble: the stake the bookmaker asks for, the price the qualifying bet must be at and the deadline before everything expires.

The stake-not-returned rule. A free bet in Great Britain usually does not return the stake with a win. Dabble’s welcome offer, for instance, pays ten pounds back as a free bet for a ten-pound first stake, but the free-bet stake is taken off any winning return. Hollywoodbets runs a similar shape: a first losing accumulator of three legs or more at minimum combined odds of 4/1 gets the stake returned as a free bet of up to thirty pounds. The headline and the receipt are two different numbers, and a punter who reads only the first one tends to be surprised by the second.

The 10x cap. Since 19 January 2026 wagering requirements on bonuses at UK-licensed bookmakers are capped at ten times the bonus value. A ten-pound bonus at fifty times wagering used to mean five hundred pounds of qualifying bets; the cap removes that range. It does not eliminate turnover conditions. A bookmaker can still ask the punter to bet the bonus amount once, ten times or somewhere in between, and a free bet with no wagering condition is the cleanest version of the lot.

Mixed-product bans. An offer that asks the punter to bet on football to get free spins on a slot, or to play casino to unlock a sports free bet, is now banned under the Commission’s promotion rules. Sports-only promotions are the only legal kind. A punter who used to chase the largest headline number across product lines has lost a category of offer, and operators have lost a lever.

What the offers above look like in plain terms. BetUK gives four ten-pound free bets (two football accumulators of four or more legs, two multiples of two or more) for a first ten-pound sports bet within seven days of registering. VBet returns a ten-pound free bet if a verified new customer’s first bet loses. Hollywoodbets returns the stake as a free bet up to thirty pounds on a first losing accumulator. Dabble pairs a ten-pound stake with a ten-pound free-bet return. None of these figures has been checked at the operator’s site this morning, and offers change: the qualifying-bet terms, the minimum odds, the deadline and the free-bet expiry are written into each bookmaker’s own terms and the punter reads them before opting in, because the marketing line and the receipt rarely agree.

The arithmetic behind a free bet is unglamorous. A free bet of £10 at decimal odds of 3.00 returns £20 in profit if it wins; the £10 stake is gone. At odds of 2.00 the same free bet returns £10. The expected value of a free bet, averaged across many uses on a market the operator prices at a five percent margin, is roughly £4.75 per £10 of free bet. The number is what the marketing line is worth on average, and it is smaller than the headline every time.

Mobile and App

The phone is the betting shop for most UK punters now, and the app a bookmaker ships is the version of the licence a punter actually meets. Three things separate a useful app from a glossy one: speed at kick-off, what the app does that the mobile site cannot, and whether the login screen is the barrier the Commission requires it to be.

bet365 runs the most-downloaded sports betting app in the UK. It is also the official global betting partner of the UEFA Champions League. The app carries Bet Builder+ for combining markets from a single event into one bet, Super Boosts and Winnings Boosts on Bet Builders and selected singles, plus daily Bet Boosts. In-play betting, live streaming of events worldwide, Bet Track, Match Live and a Live Golf Tracker are all reachable from a phone in a few taps. Face ID login is supported on devices that have it. The app funds by debit card, PayPal and Apple Pay. It is the reference version of the category.

Midnite accepts Visa, Mastercard, Apple Pay, Google Pay and Trustly. Its site shows in-play events, an acca builder, popular accas and price boosts with maximum-stake limits attached, and it cites Gambling Commission licence 101839. The links to GambleAware, GamCare, GAMSTOP and BetBlocker are reachable from the safer-gambling page. The account is built for a punter who values the in-play tabs and the boosted prices over a long-tail sport catalogue.

Betmaster accepts Visa, Mastercard, Maestro and V PAY. Its safer-gambling page carries deposit and session limits, time-outs and self-exclusion, with links to GambleAware, GAMSTOP, BetBlocker and GamCare. The 5x cap on display wagering and the £30 free-bet ceiling are operator-side numbers the punter checks before opting in, not headline numbers.

DAZN Bet sets a £5 deposit floor for debit card, Apple Pay, Paysafecard, Trustly and Skrill, and £20 by PayPal, with no processing fee. A punter who wants to start with a fiver and add from there finds the door; a punter who pays by PayPal and wants a small stake pays a higher minimum.

Spreadex carries both fixed-odds betting (Gambling Commission) and financial spread betting (FCA). The FCA cover is for the financial-spread side; the fixed-odds side sits under the Commission’s remote licence. Spread-betting losses can exceed the deposit, and the same FCA banner that explains the upside also explains that.

Star Sports lets new and existing customers ring a trader on 08000 521 321 to open an account, place bets or raise a query, and also offers email support at [email protected]. The phone-based service is rare in the category and matters to a punter who does not want to type a problem into a chat box.

Bet Types and Odds

A bookmaker’s odds are not a number; they are a margin dressed as a number. The same fixture priced at 1.91 / 1.91 by one bookmaker and 1.85 / 1.85 by another looks like a six-pence gap. It is not: the first prices a market at roughly 4.7 percent margin, the second at roughly 8.1 percent. On a hundred-pound stake that is £2.40 difference in expected cost, every time the bet is placed.

The arithmetic behind the gap. For a two-way market with decimal odds O₁ and O₂, the payout share is calculated as 1 ÷ (1/O₁ + 1/O₂). The bookmaker’s margin is 1 minus that payout share. Two odds of 1.90 / 1.90 give a payout share of 1 ÷ (1/1.90 + 1/1.90) = 1 ÷ (0.5263 + 0.5263) = 1 ÷ 1.0526 = 0.9500, or 95 percent. The margin is 5 percent. Two odds of 1.85 / 1.85 give 1 ÷ (0.5405 + 0.5405) = 1 ÷ 1.0811 = 0.9250, or 92.5 percent, a margin of 7.5 percent. The same fixture, two bookmakers, the punter keeps the difference in expected cost. Margins reported in this range — 5 percent at the sharper end, 8 to 10 percent at the wider end — are typical for a major-fixture two-way market; smaller leagues and exotic markets routinely clear 10 percent and can run past 15.

Best Odds Guaranteed. A handful of UK horse-racing bookmakers guarantee that if a punter takes the price on a horse and the starting price returns a bigger number, the bet is settled at the bigger number. The offer is a feature of the firm, not a market edge. Punters who back horses after the declarations settle get the bigger of the two prices for free.

Bet Builders. A bet builder combines markets from one event into a single price. The combined price is the multiplied leg, and the margin on the combined is generally higher than the margin on a single market, because the bookmaker is pricing several correlated outcomes. Bet Builder+ at bet365 carries a Winnings Boost feature that pays out extra on winning builders, which adds to the appeal but does not change the underlying margin.

Cash Out. Cash out lets a punter close a bet before the final outcome is known, at a price the bookmaker sets live. The cash-out price carries its own margin, which is rarely disclosed. A punter who uses cash out on an accumulator accepts that the bookmaker’s edge is wider on the live price than on the pre-match price, because the alternative is the bookmaker absorbing the position.

Combination bets and the multiplication. A treble at 2.00, 3.00 and 4.00 has a combined decimal price of 24.00. A ten-pound stake returns £240 on a win. The three legs are priced at margins that may be different from one another, and the combined margin is higher than any single leg, because each leg’s margin compounds into the next.

Lucky 15, Yankee, Heinz and friends. A Lucky 15 is fifteen bets on four selections: four singles, six doubles, four trebles and one four-fold. The unit stake is multiplied by fifteen. A Yankee is eleven bets on four selections (no singles). A Heinz is fifty-seven bets on six selections. A Goliath is two hundred and forty-seven bets on eight. The bookmaker’s edge on a combination bet is the compounded edge on each leg, and a small edge per leg becomes a meaningful one across a multi-leg wager.

Sports and Tournaments

The ten operators differ in the catalogue they price. A punter who only bets on football and horse racing can use any of them; a punter who wants NASCAR, chess or correct-score specials has fewer doors.

Horse racing. Best Odds Guaranteed is a horse-racing feature, not a generic offer, and a bookmaker without it loses a chunk of racing customers on principle. William Hill, bet365 and a handful of others run it daily on UK and Irish racing. Each-way betting is a fixture of the category; the place terms are written into the bookmaker’s own rules and vary by race type and field size.

Football. The Premier League sits behind the largest single-fixture liquidity in the UK market, and Champions League nights are second. Bet Builder+ at bet365 is built for this category: combining shots, cards, corners and goalscorer markets into one bet. The wider the leg list, the higher the compounded margin, and the punter who builds a six-leg accumulator for the entertainment pays for it in expected cost.

NBA, NFL, tennis and cricket. Major US sports, Grand Slams and international cricket are priced by all the large operators. Smaller federations, lower-tier tennis and women’s domestic cricket are where the catalogue starts to thin. A punter who wants Wimbledon outright winner, Australian Open outright winner and US Open outright winner finds them at the large bookmakers; a punter who wants Challenger tennis or county cricket seconds needs to check the operator’s site.

Snooker, darts, esports and specials. bet365, William Hill and a few others run a deep specials book on TV shows, politics awards and novelty markets. Esports are priced like any other event; virtual events sit under a separate licence category on the Commission’s register, and the bookmakers offering virtuals run them under their virtual-events licence.

The Ten Licensed Bookmakers

Ten operators carry a remote general betting licence from the Gambling Commission and serve customers in Great Britain. The cards below compare what each one’s published terms actually state.

Spreadex — the spread-bet crossover

Spreadex is the only operator in this set that runs financial spread betting on the FCA side and fixed-odds sports betting on the Commission side. The crossover is its identity: a punter who wants spread-bet exposure to a football match or a horse race, with the regulated cover of the FCA, has one place to go. A punter who only wants a sportsbook finds the fixed-odds catalogue modest by comparison with the dedicated sports books, and the price is set for the niche, not for volume.

The terms. Remote general betting standard (real events); licence holder Spreadex Limited. Spread-betting losses can exceed the deposit, and the FCA warning applies because the FCA’s category of risk does. The fixed-odds book is small and concentrated; the spread book is the reason most customers arrive. Verdict: worth it for the punter who actually wants spread-bet exposure; a poor fit for the punter who just wants another sportsbook.

Betmaster — the Malta-licensed operator

Betmaster is operated by BM Solutions GB Ltd, registered in Malta, and runs under Gambling Commission account 65699. The combination is normal: a Commission licence at the point of consumption, with the operating company seated in a jurisdiction the Commission accepts for remote operators. The Commission’s public register is the test of who holds a licence, and Betmaster is on it.

The terms. Welcomes Visa, Mastercard, Maestro and V PAY. Safer-gambling tools include deposit and session limits, time-outs and self-exclusion, with links to GambleAware, GAMSTOP, BetBlocker and GamCare. The free-bet package and the wagering conditions are described on the operator’s own site. Verdict: a competent mid-sized bookmaker for the punter who pays by debit card and values the self-exclusion route; nothing here suggests an edge on price.

Copybet — the tipster-crossover bookmaker

Copybet UK Limited states it is licensed and regulated in Great Britain by the Commission under account 53774. The brand is built around following other punters’ bets, a model that sits between a tipster platform and a sportsbook. The Commission’s cover means the same player-protection regime applies: GAMSTOP registration, the 10x bonus cap, the £150 vulnerability-check threshold.

The terms. Free bets and welcome terms are stated on the operator’s own site. The platform combines a sportsbook with a copy-trading feed. Verdict: worth a look for a punter interested in following other bettors’ selections; the sportsbook alone is not the reason to choose it.

BetUK — the four-free-bet welcome

BetUK’s sports welcome offer gives new customers who deposit £10 or more and place a sports bet within seven days of registering four £10 free bets, two of them football accumulators of four or more legs and two multiples of two or more. The free bets expire after seven days, and opt-in is required. The £30 to £40 of headline value sits behind a real betting requirement; the punter who wants the full amount has to land the four qualifying legs.

The terms. Licence holder LeoVegas Gaming plc. The brand sits inside a larger gaming group, which matters to the corporate side but not to the wagering conditions. Verdict: a competitive welcome for a punter who plans to bet on football accas anyway; the headline number is not the receipt.

Star Sports — the phone-first bookmaker

Star Sports runs a telephone-trader service on 08000 521 321 for opening accounts, placing bets and customer queries, with email support at [email protected]. The phone service is unusual in a market that has moved almost entirely to apps and websites, and it is the reason a slice of customers still uses the brand.

The terms. Licence holder Star Racing Limited. The sportsbook catalogue and the racing focus are stated on the operator’s own site. Verdict: worth it for the punter who values a person on the end of the phone; a less natural fit for a punter who wants the slickest app.

VBet — the one free bet if the first loses

VBet’s sports welcome offer pays a £10 free bet if a verified new customer stakes £10 or more on a first-ever bet that loses. A winning first bet returns the stake plus profit and no free bet; a losing first bet returns nothing on the stake but triggers the £10 free bet. The structure rewards the loser rather than the winner, which is unusual and worth a moment.

The terms. Licence holder SCGO Limited. Verdict: modest headline value but a clean structure; a punter who backs a short-priced favourite on the first bet and gets beaten finds a free bet waiting.

Dabble — the social-leaning bookmaker

Dabble’s welcome offer is Bet £10, Get £10 in free bets on a first deposit for new customers, with minimum odds applying, a seven-day expiry and the stake not returned. The brand leans on social features: following other punters, sharing bets, and a feed alongside the sportsbook. The Commission’s cover is the same as for any other licensed operator, and the social layer is a product choice rather than a regulatory one.

The terms. Licence holder Dabble Sports UK Ltd. Verdict: a fair welcome for a punter who likes the social angle; the £10 free bet on a £10 stake is the headline and the receipt, with the stake-not-returned rule taking the typical nick.

DAZN Bet — the low-deposit floor

DAZN Bet sets a £5 deposit floor for debit card, Apple Pay, Paysafecard, Trustly and Skrill, and £20 by PayPal. No processing fees apply. The pay-by-PayPal minimum is the only meaningful exception; a punter who wants to pay by PayPal and start with a fiver has to use a different method.

The terms. Licence holder DZBT Limited. Verdict: the best deposit floor in the set for a punter who pays by debit card and wants to start with the smallest stake; less useful for a PayPal-only customer.

William Hill — the high-street heavy

William Hill lets customers deposit and withdraw by debit card from £5, with a maximum deposit of £99,000 and a maximum withdrawal of £33,000 per transaction. The brand carries the longest history of any operator in the set and the deepest high-street footprint, which matters to a punter who wants to walk into a shop and settle a bet.

The terms. Licence holder WHG (International) Limited. Verdict: the right pick for the punter who values the high-street network and the large per-transaction limits; the digital experience is competent rather than market-leading.

Hollywoodbets — the accumulator-first welcome

Hollywoodbets’ sports welcome offer returns the stake as a free bet of up to £30 on a first qualifying losing accumulator (£10+, three legs or more, combined odds of 4/1 or greater, settled within seven days), one free bet per customer. The structure is built around the punter who plans an acca on day one: a winning acca returns the stake plus profit and no free bet; a losing acca returns up to £30 in free bets.

The terms. Licence holder Hollywoodbets International UK Limited. Verdict: a clean structure for the punter who bets accas anyway; the £30 ceiling is the cap on the welcome value and is reached only on a stake of £30.

What a Bookmaker Is and What the Licence Means

A bookmaker is a business that takes bets from customers, sets the prices on those bets and pays out the winners. In Great Britain the activity is regulated by the Gambling Commission under the Gambling Act 2005 (which covers England, Scotland and Wales; Northern Ireland sits under separate legislation). Since the Gambling (Licensing and Advertising) Act 2014 a remote operator whose facilities are used in Great Britain needs a Commission licence wherever it is based. A Maltese, Curaçao or Gibraltar licence is not a substitute for taking bets from British customers.

The public register. The Commission’s public register can be searched by business name, trading name, domain or account number. It is the test of whether a brand holds a licence. A punter who sees a brand on the register knows it has been vetted for source-of-funds checks, customer identity verification, segregation of customer funds, dispute resolution and the safer-gambling duty. A punter who does not see the brand on the register should not deposit.

Licence categories. The remote general betting standard (real events) licence covers sports betting. The remote general betting standard (virtual events) licence covers virtual sports. The remote betting intermediary licence covers betting exchanges. The remote pool betting licence covers pool betting on horse and dog racing. A single operator can hold several categories and run several brands under them.

Verification before the first bet. Since 7 May 2019 a licensed remote bookmaker must verify a customer’s name, address and date of birth before the customer can deposit or gamble, including with a free bet or bonus. The verification is not optional and is not a marketing tick-box. A brand that lets a punter deposit without verification is not on the Commission’s register.

GAMSTOP. GAMSTOP is the national multi-operator online self-exclusion scheme and is a mandatory licence condition for online operators. Self-exclusion periods are six months, one year, five years, or five years with auto-renewal. After the minimum period the exclusion stays in place for a further seven years unless the customer asks GAMSTOP to remove it. Every GB-licensed online operator takes part.

Financial vulnerability check. Under LCCP condition 3.4.4 (in force since 30 August 2024) a licensed remote bookmaker runs a public-record financial vulnerability check when a customer’s deposits minus withdrawals exceed £150 in a rolling 30 days, a threshold that has applied since 28 February 2025. The check looks at public records such as bankruptcy or county court judgments; it is not an income check and not a credit reference check. Wider financial risk assessments are announced in a staged plan with no start date as of mid-2026.

The Legal Framework

The Gambling Act 2005. The Act is the principal statute, covers Great Britain, and is administered by the Gambling Commission, a non-departmental public body sponsored by the Department for Culture, Media and Sport. Northern Ireland is outside the Act.

Licence Conditions and Codes of Practice (LCCP). The LCCP sets the licence conditions and Commission licences for social responsibility, anti-money-laundering, marketing and technical standards. The 10x bonus wagering cap and the credit-card ban are written into the LCCP, as is the verification-before-first-deposit rule.

Remote Technical Standards (RTS). The RTS set the technical requirements for remote operators, including deposit limits (RTS 12). The first phase of deposit-limit changes applied from 31 October 2025; a second phase was scheduled for 30 September 2026 and whether it is live is not established.

Advertising. Advertising is regulated by the ASA under the CAP Code (non-broadcast) and BCAP Code (broadcast), alongside the LCCP marketing conditions. CAP Code section 16: marketing must be socially responsible, must not be of strong appeal to under-18s, and no one who is or seems to be under 25 may feature gambling or play a significant role in marketing, with an exception for marketing placed where a bet can be made directly. The “whistle-to-whistle” ban stops betting advertisements on TV from five minutes before a live sporting event to five minutes after it, before the 9pm watershed, with horse and greyhound racing excluded; it is an industry code, not law. The Premier League clubs’ withdrawal of gambling sponsorship from the front of matchday shirts from 2026/27 is voluntary, not law.

Credit cards. Credit cards have been banned for gambling in Great Britain since 14 April 2020 (LCCP condition 6.1.2), including credit-card-funded payments through an e-wallet. Debit cards and bank-based payments are not covered by the ban.

Mixed-product promotions. Mixed-product promotions — an offer requiring gambling on two or more product types, such as betting on football to get free spins — are banned under the promotion rules in force since 19 January 2026. Sports-only promotions are the only legal kind.

Tax. The punter pays no tax on betting winnings in Great Britain. General Betting Duty is the operator’s tax on gross profits, currently 15 percent. From 1 April 2027 a new remote betting rate of 25 percent applies within it; remote bets on UK horse racing, bets on self-service betting terminals in licensed premises, pool betting and in-person betting stay at 15 percent. Spread betting has its own rates (3 percent financial, 10 percent other). Until 1 April 2027 the remote rate stays at 15 percent. Never write that the player is charged duty.

Offshore. Providing gambling facilities in Great Britain without the licence the Act requires is an offence under section 33 of the Gambling Act 2005, aimed at the operator. Betting on an unlicensed site is not an offence for the customer; the customer’s loss is the loss of protection. No GAMSTOP coverage, no Commission complaints route, no approved dispute-resolution body, no British consumer redress if funds are withheld, and not bound by the 10x bonus cap or the £150 vulnerability check. Enforcement is disruption, not blocking: cease-and-desist notices, search-engine referrals, work with registrars, hosts and payment providers. The Commission has been given, or is about to receive, court-order DNS blocking powers; ISP blocking is not in operation as a routine. The honest framing: licensed = checks, limits, GAMSTOP, bonus cap, but also verification before the first bet; unlicensed = none of those protections and possible loss of funds. Neither is “the safe choice” by default.

Responsible Gambling

A bookmaker’s safer-gambling tools are a duty, not a favour. The LCCP requires them; the Commission’s enforcement looks for them; the punter uses them when they need them.

Deposit limits. Operators must offer a gross deposit limit on a fixed time frame under RTS 12. The first changes have applied since 31 October 2025; a second phase was postponed to 30 September 2026. Limits are the customer’s choice. There is no state-set deposit or loss ceiling for betting.

Time-outs and self-exclusion. A time-out is a short break; a self-exclusion is a longer one. Both are operator-side; GAMSTOP is the multi-operator version and is mandatory for online operators.

The £150 vulnerability check. When deposits minus withdrawals exceed £150 in a rolling 30 days, the operator runs a public-record financial vulnerability check. The threshold applies since 28 February 2025; the rule was in force from 30 August 2024.

Where to get help. GamCare runs the National Gambling Helpline. GambleAware funds treatment and research. NHS gambling clinics offer specialist treatment. Gamblers Anonymous runs peer-support meetings. The punter who feels their betting is no longer recreational rings the helpline first.

The frame. Responsible gambling is not a marketing line. A bookmaker’s safer-gambling page is checked for links to these services and for the deposit-limit controls; a bookmaker that hides the page or buries the links is making a statement, and the punter reads it.

Frequently Asked Questions

Which UK bookie offers the best odds?

No bookmaker is permanently best-priced. Margins on major football and horse racing sit in the four-to-eight percent range across the licensed set, and the leader at one fixture is rarely the leader at the next. A punter who wants the tightest prices holds two or three accounts, checks the odds on the fixture they want to back, and accepts the verification step that comes with each. Best Odds Guaranteed on horse racing is a different question and a different answer; a bookmaker that runs BOG settles the bet at the bigger of the taken price and the starting price.

Which bookie gives best prices for live bets?

In-play margins are wider than pre-match margins on the same market, because the bookmaker’s price has to absorb position risk on a market that is moving every second. bet365 runs the largest in-play catalogue in the set, with live streaming of events worldwide, Match Live, Bet Track and a Live Golf Tracker. Smaller bookies price fewer in-play events and at wider margins. A punter who lives on the in-play tabs takes the wider margin as the cost of the feature.

Which online bookie is the best?

There is no single answer. “Best” depends on what the punter bets on, how much they stake, what payment method they use and how much they value the phone service. William Hill is the high-street heavyweight; bet365 is the app-and-in-play benchmark; DAZN Bet is the low-deposit floor; Star Sports is the phone-first bookmaker; Copybet is the copy-trading crossover. The ten operators in the comparison above are each the best for one punter and a poor fit for another, and the punter’s own betting decides the ranking.

How can it be checked that a bookmaker holds a Gambling Commission licence?

The Commission’s public register can be searched by business name, trading name, domain or account number. The register is the only authoritative source; a brand’s own claim to be licensed is not. A punter who sees the operator on the register, with the licence category covering the activity they want to bet on, has done the check. A brand not on the register is not licensed for the GB market, and the punter’s protection under the LCCP, GAMSTOP and the dispute-resolution regime does not apply.

How is the return on a bet worked out from the stake and the odds?

For a single bet at decimal odds O and stake S, the return on a win is S × O, which is the stake plus the net profit of S × (O − 1). At odds of 3.00 and a stake of £10, the return is £30 (£10 stake plus £20 profit). At odds of 1.50 the return is £15 (£10 stake plus £5 profit). For a combination bet the legs multiply into one price: a treble at 2.00, 3.00 and 4.00 has a combined price of 24.00, and a £10 stake returns £240 on a win. Fractional odds are converted by dividing the numerator by the denominator and adding one: 5/1 becomes 6.00, 11/4 becomes 3.75, evens becomes 2.00.

What is the bookmaker’s margin and how can it be seen in the odds?

The margin is the slice of every pound staked that the bookmaker keeps on average. For a two-way market with decimal odds O₁ and O₂, the payout share is 1 ÷ (1/O₁ + 1/O₂) and the margin is 1 minus that. Two odds of 1.90 / 1.90 give a payout share of 95 percent and a margin of 5 percent. Two odds of 1.85 / 1.85 give 92.5 percent and a margin of 7.5 percent. Margins on major fixtures sit in the four-to-eight percent range; smaller leagues and exotic markets clear ten percent and can run past fifteen. The wider the margin, the more the punter pays on every bet, and the punter who tracks margins across operators sees the gap as pounds per hundred staked over a season.

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