The price you take on a bet is the one thing entirely within your control. You cannot decide the result of a match, but you can decide whether to accept 2.10 or 2.25 for the same outcome. Across hundreds of bets, that choice is the biggest single factor in how much betting costs you. This guide explains how to find the best odds in Britain and which sites consistently offer them. For our overall rankings, see the main guide to the best betting sites.
Where the best prices usually are
| Market | Usually best price | Why |
|---|---|---|
| Big football matches | Betfair Exchange, Smarkets | Deep liquidity and no fixed margin |
| UK and Irish racing | Exchanges, then BOG bookmakers | Best Odds Guaranteed can beat the exchange at the off |
| Niche football markets | Varies, compare every time | Exchange liquidity is thin, bookmaker margins vary |
| Accumulators | Best price on each leg | Small gaps multiply across legs |
The honest answer to "which site has the best odds" is that none does every time. What you can do is build a routine that finds the best price quickly.
A routine matters more than any single site. The punters I saw paying the least in margin were not the ones with the most accounts. They were the ones who checked the price every time, even on small bets, because the habit was automatic.
Reading odds as a percentage
Before you can compare prices well, it helps to think in probabilities. Decimal odds of 2.00 mean the bookmaker is pricing the outcome at 50 percent. Odds of 4.00 mean 25 percent. To convert, divide 1 by the decimal odds. Fractional odds work too: 3/1 is the same as 4.00, or 25 percent.
Thinking in percentages makes the size of price differences obvious. The gap between 2.10 and 2.25 looks small, but the first implies a 47.6 percent chance and the second 44.4 percent. If the true chance is 46 percent, one bet has value and the other does not.
Implied probability and value
A bet has value when the chance of it winning is higher than the probability implied by the odds. Nobody knows the true chance of any outcome, including the bookmaker. But you can make a reasonable estimate, and the exchange price is a good starting point. If a bookmaker's price implies a lower probability than the exchange, that price is more generous than the market's consensus.
How margins differ between bookmakers
A bookmaker's margin is the amount by which its implied probabilities exceed 100 percent. When I worked in a trading team, margins were set by market type, and the most competitive markets received the thinnest margins because customers compared them most. The same is true across the industry today.
Where margins are thin
Match odds on top-flight football, favourites in big horse races and major tennis matches tend to carry the smallest margins. Bookmakers compete hard for this business, and the differences between firms are often small.
Where margins are wide
Goalscorer markets, correct scores, bet builders and novelty markets carry much bigger margins. So do lower leagues and minor sports, where fewer customers compare prices. The difference between the best and worst bookmaker can be several percentage points on these markets.
Illustrative example of how one outcome can be priced across the market. Real prices change constantly.
How margins are set
On the trading team I worked on, the margin on each market was set by a combination of competitor prices, expected customer interest and the risk of being wrong. Popular markets with plenty of information, such as Premier League match odds, were priced tightly. Markets where information was scarce, such as lower-league goalscorers, carried a wider margin as protection against mistakes. The same logic applies across the industry.
Using odds comparison sites
Odds comparison sites list the prices from many bookmakers side by side, so you can see the best available price on a selection at a glance. They are the fastest way to check whether a price is competitive. Most are free and funded by bookmaker advertising, which is worth bearing in mind, because they sometimes highlight the bookmakers that pay them most.
Using comparison sites well
Only look at the bookmakers you actually have accounts with. The best price in the table is no use if it belongs to a site where you would need to register, verify and deposit first. It also helps to check the price on the bookmaker's own site before betting, because comparison data can be a few minutes behind.
Timing matters
Prices move throughout the day. On football, early prices published days before a match can be generous, because bookmakers compete for early business and team news is not yet known. On the morning of a race, early prices can also be strong. The trade-off is that maximum stakes on early prices are often lower, and the price may shorten or drift as more information arrives.
Comparison sites are also useful for spotting when one bookmaker is clearly out of line with the rest of the market. A price well above everyone else can be a genuine opportunity or a sign that the bookmaker has not yet reacted to news, such as a team change. Checking the latest news before betting on an outlier price is a sensible habit.
The exchange as a benchmark
On liquid markets, the exchange price is the closest thing to a fair price that exists. It reflects the combined view of everyone betting on the market. I use it as a benchmark: if a fixed-odds bookmaker is offering a bigger price than the exchange after commission, that bookmaker is being generous. If it is offering a smaller price, I bet on the exchange instead.
To compare fairly, reduce the exchange winnings by the commission. At 2 percent commission, a back bet at 3.00 returns winnings of £2 per £1 staked, minus 4p commission, which is equivalent to fixed odds of about 2.96. At 5 percent commission, the equivalent is 2.90.
Liquidity and the lay price
The gap between the back and lay prices on an exchange tells you how reliable the price is. On a busy market, the two might be 2.30 and 2.32. On a quiet market, they might be 2.30 and 2.60. A wide gap means little money is available and the price is less meaningful as a benchmark. In that case, a fixed-odds bookmaker may be the more practical option.
Best Odds Guaranteed on racing
Best Odds Guaranteed is the most valuable price feature for racing punters. If you take a fixed price and the official starting price is bigger, you are paid at the starting price. It means an early price can only work in your favour. Most big bookmakers offer BOG on UK and Irish racing, although conditions vary and some remove it from certain accounts.
BOG changes the comparison with the exchange. The exchange might offer a bigger price now, but a bookmaker with BOG gives you the chance of a bigger price at the off. For horses you expect to drift, BOG can be the better option even when the exchange looks bigger at the time of betting.
Conditions to check
Look at the start time for BOG, as some bookmakers only apply it from a certain point on race day. Check whether there is a cap on the extra winnings BOG can pay. And check your own account from time to time, because BOG can be removed for individual customers without much notice.
Are price boosts really the best odds?
Price boosts look like the best odds available, and sometimes they are. But a boost is measured against the bookmaker's own normal price, not the market's. I have seen plenty of boosts that were still smaller than the exchange price or another bookmaker's standard price. Always compare before assuming a boost is good value.
Boosts also tend to have low maximum stakes. That is not a trick, just risk management, but it means boosts rarely make much difference to your overall results. Treat them as a small bonus when they happen to match a bet you already wanted.
Best odds on accumulators
Small price differences grow quickly in accumulators because the odds multiply. Take a four-fold where each leg is available at 2.00 at one bookmaker and 2.10 at another. At the first, the combined odds are 16.00. At the second, they are 19.45. That is more than 20 percent extra on the potential return for exactly the same selections.
Splitting an acca
You cannot place a single accumulator across several bookmakers, so the best you can do is find the bookmaker offering the best combined price. Some punters prefer singles for exactly this reason, taking the best price on each selection. Acca boosts and insurance can shift the calculation, so compare the final potential return rather than the headline offer.
Before placing any accumulator, check whether an acca boost applies and whether it is calculated on the winnings or on the whole return. A 10 percent boost on winnings sounds modest, but it can close the gap between one bookmaker's combined price and another's. Always compare the final potential returns side by side.
Why the best price is not always available to you
This is the uncomfortable truth I learned working in risk. The bookmakers most likely to offer the best prices are also the most likely to limit customers who consistently take them. If you regularly bet at prices that turn out to be bigger than the starting price, your account may eventually have its stakes reduced.
For most casual punters this never happens. But if you become serious about taking the best odds, expect some of your fixed-odds accounts to be restricted over time, and keep an exchange account as the one place where winning does not lead to limits.
What a restriction looks like
You will usually notice it when a bet is only partly accepted, with the site offering a smaller maximum stake than you requested. Promotions may also stop appearing. Your existing balance is unaffected and you can still withdraw it. If you would rather not be restricted, spreading your betting across several accounts and taking fewer early prices can delay it, though not necessarily prevent it.
Remember that the aim is not to avoid restrictions at any cost. It is to get fair prices for as long as possible and to have a fallback when a bookmaker decides it no longer wants your bets.
A simple routine for finding the best odds
Keep accounts with one exchange and two or three bookmakers, ideally including one with good BOG terms for racing. Before each bet, check the exchange price and a comparison site. If a bookmaker beats the exchange after commission, bet there. If you are betting on racing and expect the price to drift, favour a BOG bookmaker. Record every bet with the price you took and the starting price. Over a few months, your records will show clearly whether your routine is working.
Finally, set a deposit limit at each account before you start. Finding the best odds makes betting cheaper, but it does not change the fact that most bets lose. The limit is what keeps the cost within what you are happy to spend.
It is worth reviewing your routine every few months. Look at which bookmaker you took the best price from most often, and whether any account has stopped offering good value. The market changes, and so do individual bookmakers' pricing strategies. A routine that worked last season may need adjusting this one.
Questions readers ask
Which betting site always has the best odds?
None does every time. Exchanges are usually best on popular markets, but individual bookmakers regularly beat them on specific selections. Checking a comparison site and the exchange before each bet is the reliable approach.
How do I compare exchange odds with bookmaker odds?
Reduce the exchange winnings by the commission rate. The equivalent fixed odds are 1 plus the exchange odds minus 1, multiplied by 1 minus the commission rate.
Are price boosts the best odds available?
Not always. A boost is compared with the bookmaker's own normal price, so it can still be below the exchange or another bookmaker's standard price. Always compare.
Will taking the best odds get my account limited?
It can. Bookmakers may reduce stake limits for customers who consistently take prices that later shorten. Exchanges do not restrict winning customers in the same way.
Joanna Whitlock
Odds analyst and editor
Joanna spent nine years in the risk and trading team of a UK bookmaker, setting limits and watching which customers the business wanted to keep. She now lives in Margate and writes about betting from the other side of the counter, with a spreadsheet open at all times.