Home / Stats & Records / Bookmaker margins
LiveFree dataUpdated every day

Which bookmaker has the best odds on horse racing?

Average win-market overround for 26 bookmakers over the last 30 days of British and Irish racing, lowest first. The window rolls forward every day, so the ranking can change from one week to the next.

Rolling 30 days to 15 October 2026, 1,134 races; updated daily · Results to 15 October 2026 · Refreshed 16 October 2026
111.3%
Lowest average overround
121.5%
Average at the off
127.6%
Average in the morning
1,134
Races in 30 days
111.3%

Over the last 30 days of British and Irish racing, SmarketsSBK had the lowest average win-market overround of the 26 bookmakers tracked, at 111.3% on the final show before the off, against an average of 121.5%.Sample: 1,134 races · Window: 16 September 2026 to 15 October 2026 · Source: RaceWatch odds history (29 bookmakers and exchanges)

Go deeper before the next race.

Open every racecard in full and get your research done before they go to post.

  • 14racecard tabs per race
  • 20+bookmaker prices side by side
  • Trackeralerts when your horses are declared

30-day free trial

£0today

Start my 30-day free trial

By continuing you agree to our Terms and Intellectual Property and Acceptable Use policy.

£0 today. Card on step 2. £24.99 from day 31.Cancel any time.

Average final-show overround by bookmaker, last 30 days
SmarketsSBK111%Betfred118%Bet365118%Quinn Bet120%Virgin Bet120%LiveScore Bet120%Unibet120%Boyle Sports120%Star Sports120%10 Bet121%7Bet121%William Hill121%Bet Victor121%Betano121%Midnite122%Dragon Bet122%BetMGM122%Hollywood Bets122%BetTom122%Spreadex123%SportingIndex123%BetWright123%Paddy Power124%Betfair Sportsbook127%

Overround

Bookmaker margins, last 30 days

SmarketsSBK111.3%11.3%117.8%1,131114.4%108.2%112.0%Bookmaker-
Betfred118.3%18.3%127.3%1,133127.1%111.3%119.1%Bookmaker-
Bet365118.5%18.5%124.2%1,127128.4%110.2%119.3%Bookmaker-
Quinn Bet119.9%19.9%126.8%1,134129.6%111.7%120.8%Bookmaker-
Virgin Bet120.2%20.2%126.7%1,122130.5%111.8%121.2%Bookmaker-
LiveScore Bet120.2%20.2%126.6%1,117130.5%112.0%121.1%Bookmaker-
Unibet120.3%20.3%126.9%1,133131.1%111.5%121.1%Bookmaker-
Boyle Sports120.4%20.4%128.9%1,134130.3%112.1%121.3%Bookmaker-
Star Sports120.5%20.5%128.2%1,127130.2%112.4%121.1%Bookmaker-
10 Bet120.9%20.9%127.6%1,130130.8%112.7%121.8%Bookmaker-
7Bet120.9%20.9%129.1%1,074129.4%113.5%121.7%Bookmaker-
William Hill121.1%21.1%125.3%1,131130.4%113.2%121.9%Bookmaker-
Bet Victor121.1%21.1%130.6%1,133131.0%112.6%122.1%Bookmaker-
Betano121.1%21.1%130.6%1,133130.9%112.6%122.2%Bookmaker-
Midnite121.9%21.9%128.4%1,132131.6%114.0%122.5%Bookmaker-
Dragon Bet121.9%21.9%132.1%1,134130.5%113.9%122.6%Bookmaker-
BetMGM122.2%22.2%134.8%1,126132.7%113.4%122.9%Bookmaker-
Hollywood Bets122.4%22.4%126.6%1,118133.7%113.1%123.3%Bookmaker-
BetTom122.4%22.4%125.0%1,128133.1%113.6%123.3%Bookmaker-
Spreadex122.9%22.9%123.9%1,130133.4%113.4%124.4%Bookmaker-
SportingIndex122.9%22.9%123.9%1,130133.5%113.4%124.4%Bookmaker-
BetWright123.4%23.4%132.0%1,134133.2%114.2%124.2%Bookmaker-
Paddy Power123.7%23.7%127.7%1,133136.1%114.2%124.9%Bookmaker-
Betfair Sportsbook126.9%26.9%130.5%1,134138.9%117.6%127.9%Bookmaker-
Coral127.2%27.2%128.3%1,132133.0%119.4%127.4%Bookmaker-
Ladbrokes127.2%27.2%128.3%1,132132.9%119.5%127.5%Bookmaker-
Matchbook101.6%1.6%116.5%977102.3%100.5%101.7%Exchange-
Betfair Exchange101.7%1.7%122.7%1,065102.8%100.8%101.8%Exchange-
Smarkets102.4%2.4%112.0%1,069103.6%101.4%102.7%Exchange-

Average win-market overround per race, British and Irish racing, last 30 days. Final show = the last price for each runner in the 20 minutes before the off; morning = the last price at or before 10:00 on race day, for races where every eventual runner was priced. A race counts only when the firm priced every runner. Exchanges (Betfair Exchange, Matchbook, Smarkets) are listed separately; SmarketsSBK is the Smarkets sportsbook. Source: RaceWatch odds history.

Best price share

SmarketsSBK65.8%7,16610,896-
Bet36520.7%2,25010,857-
Unibet17.9%1,94910,907-
Hollywood Bets15.5%1,66910,759-
Betfred15.4%1,68110,904-
Paddy Power13.4%1,45610,896-
10 Bet12.6%1,37310,875-
Virgin Bet12.4%1,34010,801-
LiveScore Bet12.3%1,32010,755-
Star Sports11.6%1,26010,852-
BetTom11.5%1,24910,853-
7Bet11.0%1,12510,199-
Bet Victor10.6%1,15410,907-
William Hill10.4%1,13010,894-
BetMGM10.4%1,12510,852-
Quinn Bet10.3%1,12510,916-
Betano10.3%1,11810,907-
Boyle Sports9.7%1,06110,916-
Spreadex9.5%1,03210,884-
SportingIndex9.4%1,02610,884-
BetWright9.0%97810,916-
Dragon Bet8.7%95310,916-
Coral8.4%92110,905-
Ladbrokes8.3%90410,905-
Betfair Sportsbook7.3%79510,916-
Midnite7.2%78410,900-

How often each bookmaker was top price (ties count for every firm at the top price) on the final show, last 30 days. Exchanges excluded.

Overround by field size

Under 8 runners345113.3%118.0%
8 to 11 runners470121.1%126.5%
12 to 15 runners256129.0%137.4%
16 or more runners63139.6%149.0%

Average across all bookmakers (exchanges excluded).

Overround by race type

Chase handicap85116.4%121.4%
Chase non-handicap22114.8%119.2%
Flat handicap524123.1%129.9%
Flat non-handicap270120.4%125.6%
Hurdle handicap126123.3%129.2%
Hurdle non-handicap87120.2%126.2%
NH Flat non-handicap20118.7%125.0%

Average across all bookmakers (exchanges excluded). Minimum 20 races.

How to calculate a margin

1Convert each price to an implied probability: 1 divided by the decimal odds. …
2Add up the implied probabilities for every runner in the race. The total is t…
3Subtract 100% to find the margin. A 115% book has a 15% margin; the lower the…

Market moves across 20+ bookmakers

Members see prices and market moves from 20+ bookmakers on every runner in today's racecards, next to RWS scores and full form.

Start free trial

By continuing you agree to our Terms and Intellectual Property and Acceptable Use policy.

Which bookmaker offers the best odds on horse racing?

SmarketsSBK has the lowest average overround of the 26 bookmakers tracked, at 111.3% on the final show. The main table ranks every bookmaker from lowest to highest margin over the last 30 days.

How is a bookmaker's margin calculated?

Convert each price to an implied chance, add the chances for every runner, and the total is the overround. The margin is the part above one hundred per cent, and the how-to table walks through each step.

Are margins bigger in big fields than in small ones?

The field size table sets the overround for fields of under 8 runners up to 16 or more side by side, from the same 30 days of racing.

Do margins change between the morning and the off?

Across all bookmakers tracked, the average morning overround was 127.6% against 121.5% on the final show, from 1,134 races. Each bookmaker's own morning figure sits beside its final figure.

Which bookmaker is most often top price?

The best price share table counts how often each bookmaker offered the biggest price, or a share of it, on each runner over the same 30 days.

Questions people ask

Which bookmaker has the best odds on horse racing?

Over the last 30 days of British and Irish racing, SmarketsSBK had the lowest average win-market overround, at 111.3%. A lower overround means prices closer to the true chances, although the top price on a single runner can still come from another firm.

What is a bookmaker's margin?

A margin is the amount by which the implied chances of every runner in a market add up to more than one hundred per cent. On British and Irish racing the average final-show overround across the bookmakers tracked is currently 121.5%.

Do bookmaker margins change closer to the off?

Over the last 30 days the average morning overround was 127.6% against 121.5% on the final show. Each bookmaker's morning and final figures sit side by side in the main table, so the change can be checked firm by firm.

How often is the bookmaker margins table updated?

The table covers a rolling 30-day window and refreshes every day after racing. Rankings can move as each new day of prices enters the window and the oldest day drops out.

Why are some bookmakers flagged?

A flag marks a bookmaker priced on a small number of races in the window, so its average can move sharply. A flagged overround is a guide rather than a settled figure.

More free data

Favourite win rateHow often the market leader winsShock winners by courseWhere 10/1 and bigger wins mostFavourites by field sizeSmall fields against big fieldsWin rate by oddsStrike rate at every price bandRacing reportsMonthly reports and the annual review

Go deeper before the next race.

Open every racecard in full and get your research done before they go to post.

  • 14racecard tabs per race
  • 20+bookmaker prices side by side
  • Trackeralerts when your horses are declared

30-day free trial

£0today

Start my 30-day free trial

By continuing you agree to our Terms and Intellectual Property and Acceptable Use policy.

£0 today. Card on step 2. £24.99 from day 31.Cancel any time.

Updated