A UK beginner's guide to arbing: what you need before your first bet, how the calculation works, the tools that do the maths for you, and the mistakes that cost new bettors their margin.
Quick answer
To start arbitrage betting, you need accounts with multiple bookmakers, enough betting funds to cover both sides of an opportunity, and a reliable way to compare odds and calculate stakes. You then identify a market where the available prices create an arbitrage, calculate the stakes required for each outcome, verify that the prices and stakes are still available, and place all bets before the odds change.
Arbitrage betting can produce a positive return across all covered outcomes when the mathematics and execution are correct, but it is not completely risk-free in practice. Odds can move, bookmakers can restrict stakes, and exchange bets may not be fully matched.
Arbitrage betting has become one of the most popular ways for UK sports bettors to reduce risk while aiming for consistent profits. Instead of trying to predict winners, arbitrage betting takes advantage of differences in odds offered by different bookmakers to lock in a return, regardless of the result.
The concept sounds simple, but getting started successfully requires more than opening a few bookmaker accounts. You'll need to understand how arbitrage opportunities work, how quickly markets move, and how to calculate stakes accurately.
In this beginner's guide, you'll learn how to start arbitrage betting, discover the tools that make the process easier, and avoid the common mistakes many new arbitrage bettors make. Whether you're completely new or already familiar with matched betting, this guide will show you everything you need to know to get started.
Arbitrage betting (often shortened to "arbing") involves placing bets on every possible outcome of an event using different bookmakers whose odds create a pricing difference. Because bookmakers don't always price events identically, there are occasions where combining their odds creates a mathematical profit regardless of who wins.
Bookmaker
Outcome
Odds
Bookmaker A
Man Utd to win
2.20
Bookmaker B
Man City to win
2.15
1 ÷ Odds A + 1 ÷ Odds B < 1
This translates to 1 ÷ 2.20 + 1 ÷ 2.15 = 0.91 for this example. Because the result is below 1, this is an arbitrage opportunity. By staking the correct amounts on each outcome, you can lock in a profit whichever team wins.
Unlike traditional betting, arbitrage betting isn't based on predicting sporting outcomes — it's based on exploiting pricing inefficiencies. If you'd like a deeper explanation of the fundamentals, see our complete arbitrage betting guide.
Many newcomers to matched betting are soon attracted to arbitrage betting because it offers a mathematical approach rather than trying to predict which team or player will win. By comparing prices across bookmakers and covering the relevant outcomes, an arbitrage can potentially produce a positive return when the required odds and stakes are available.
Some of the biggest advantages include:
The strategy isn't risk-free in practice. Odds can change, available stakes can be limited, and mistakes can affect the final result. Checking the market and recalculating the stakes immediately before placing the bets is essential.
This is why experienced arbitrage bettors rely heavily on specialist software rather than searching manually.
Arbitrage betting strategies require comparing odds across several bookmakers and/or betting exchanges. The more bookmakers you have available, the more opportunities you'll be able to access. Popular UK bookmakers include Bet365, William Hill, Paddy Power, Betfred, BoyleSports, Coral and Ladbrokes.
What the data says
The Gambling Commission recorded 6,226,358 active real-event betting players in March 2026 among the largest operators covering around 70% of the online market. That scale demonstrates how substantial the UK betting ecosystem is — and why having access to multiple markets can matter when looking for price differences.
While bookmaker-to-bookmaker arbitrage is common, many experienced bettors also use betting exchanges. This involves placing bets at bookmakers and laying the same selection at a betting exchange. Exchanges can provide additional opportunities and often offer more competitive prices. The good news is there are multiple betting exchange sites in the UK — you can find out more in our betting exchange guide.
A dedicated bankroll allows you to spread funds across multiple bookmakers. Because your money will often be split between several betting accounts, having sufficient liquidity helps you react quickly when opportunities appear.
Your starting amount depends on the minimum and maximum stakes available, the size of the opportunities you intend to take and how much money you can comfortably set aside. Start with an amount you can afford to lose and increase your stakes only when you understand the process and have sufficient funds available.
Comparing prices manually across multiple bookmakers can take time, particularly when odds are changing quickly. OddsMonkey's tools can help you compare prices, calculate stakes and assess potential returns in one place.
What the data says
The scale of online betting helps explain why manually checking markets can be inefficient. Between January and March 2026, the largest online operators recorded 26.8 billion bets and spins overall, while real-event betting alone generated £600 million in Gross Gambling Yield.
OddsMonkey's arbitrage software automates much of the hard work by:
This significantly reduces mistakes while saving countless hours.
Learn how arbitrage works. Before risking any money, understand the mathematics: why arbitrage exists, how bookmaker pricing differs, how profit is calculated and how stake balancing works. Learning these fundamentals helps prevent expensive errors later.
Open multiple bookmaker accounts. The more bookmakers you can compare, the better. The same applies to betting exchanges. Complete any identity verification early so you're ready to place bets immediately when opportunities arise.
Use arbitrage software. Rather than searching bookmaker websites individually, use OddsMonkey's software to display live arbitrage opportunities, including qualifying bookmakers, odds, recommended stakes, expected return and percentage profit. The OddsMatcher, Dutching Calculator and Arbitrage Calculator handle almost all of the manual calculations.
Place both bets quickly. Arbitrage opportunities can disappear within seconds as bookmakers and exchanges update their odds. Check odds before confirming, place both bets as quickly as possible and avoid delays between bookmakers.
Record your bets. Keeping records helps you monitor profits, bookmaker balances, return on investment and restricted accounts. Many successful OddsMonkey members use the Profit Tracker to track every bet they place.
OddsMonkey expert insight
"Software can identify a mathematical arbitrage, but it cannot guarantee that the bet is executable. Before clicking confirm, check the market, selection, available stake and current price on both sides. Treat every alert as an opportunity to verify, not an instruction to bet."
Lora Savage, OddsMonkey Customer Service Executive and Arbitrage Betting Expert
Before placing
Check
Market
Same event and exact market
Selections
All outcomes covered
Odds
Current odds still available
Stakes
Required stake available
Exchange
Liquidity and commission checked
Settlement
Rules and void conditions understood
Profit
Recalculated at current prices
Example
Suppose a tennis match has the following odds:
Outcome
Bookmaker
Odds
Player A
Bookmaker A
2.12
Player B
Bookmaker B or betting exchange
2.08
Profit on a £102 total stake
£5.09
An arbitrage calculator determines £50.48 on Player A and £51.52 on Player B, a total stake of £102 returning approximately £107 either way — a profit of around £5 regardless of who wins. This demonstrates why accurate stake calculations are so important.
You could spend ages working out stake amounts and potential profit, or you could spend seconds entering the total stake and odds into the Dutching Calculator:
Even though arbitrage betting is mathematical, beginners still make avoidable mistakes.
Markets move constantly. If one bookmaker changes their odds before you've placed both bets, your expected profit may disappear.
Small calculation errors can eliminate profits entirely. Always use an arbitrage calculator instead of estimating.
Not every arbitrage is worth placing. Some opportunities offer extremely small returns after considering commission, stake size or account limitations. Experienced bettors often prioritise higher-quality opportunities.
OddsMonkey expert insight
"A two-percent arb can look attractive on a screen but be poor value in practice if only a small amount is available at the quoted price. Experienced bettors judge opportunities by executable profit, not the headline percentage, particularly in fast-moving markets."
Monika Kazimierczak, OddsMonkey Arbitrage Betting Expert
One practical consideration for arbitrage bettors is that bookmakers can restrict the amount a customer is able to stake. An opportunity may therefore appear profitable based on the advertised odds but become less attractive if only a small amount is accepted at one of the required prices.
Don't assume that every displayed opportunity will be fully executable. Check the available stake and current odds immediately before placing each side of the bet.
Arbitrage opportunities appear across many sports, although some generate more frequent opportunities than others. Popular choices include:
Find out more in our guide to what sports you can place arbitrage bets on, or read the dedicated football and tennis arbitrage guides.
Yes, many OddsMonkey members combine both strategies. Matched betting uses bookmaker promotions to generate profit, while arbitrage betting focuses purely on pricing differences. Together they can provide additional opportunities throughout the year. Many experienced users start with matched betting before adding arbitrage once they're comfortable using multiple bookmakers.
Factor
Arbitrage betting
Matched betting
Main mechanism
Price differences
Bookmaker promotions
Requires free bets
No
Usually
Main skill
Finding price discrepancies
Calculating qualifying/free bets
Exchange required
Not always
Commonly used
Main risk
Execution and price movement
Calculation and terms
For information on the similarities and key differences, take a look at the arbitrage betting vs matched betting guide, and our guide on whether it is ever safe to arb alongside matched betting.
Arbitrage betting is not, in itself, a prohibited betting strategy in Great Britain. However, betting is regulated under the UK's gambling framework, and consumers should use appropriately licensed operators and understand the terms that apply to their accounts.
The Gambling Commission states that businesses providing remote gambling to consumers in Great Britain generally require the relevant operating licence. It also advises customers to check a betting website or app's licensing status before opening an account.
It's also important to distinguish legality from bookmaker policy. A bookmaker may restrict stakes or limit an account according to its own terms and risk-management policies. The fact that an arbitrage opportunity exists does not mean you will necessarily be able to place the full stake shown.
Source: UK Gambling Commission.
Arbitrage betting suits people who:
It may be less suitable for people looking for entertainment betting or long-shot wins.
Finding an arbitrage opportunity is only part of the process. You also need to calculate the right stakes, check that the prices are still available and keep track of the bets you have placed. OddsMonkey's arbitrage tools are designed to make those steps easier by helping you find opportunities, calculate stakes and monitor your results.
OddsMonkey provides:
If you're learning how to start arbitrage betting, using the right tools can reduce manual calculations and make it easier to follow a consistent process.
Yes. Many beginners start with arbitrage betting because profits are based on mathematics rather than predicting sporting outcomes. Learning the basics and using reliable software can significantly reduce mistakes.
Many UK bettors begin with a bankroll between £300 and £1,000. You can start with less, but a larger bankroll provides greater flexibility and allows you to take advantage of more opportunities.
Although arbitrage betting is legal, bookmakers may limit or restrict accounts if they believe customers are consistently exploiting pricing differences.
Yes. Having multiple bookmaker accounts is important because arbitrage opportunities arise when different operators offer sufficiently different odds on the same event. The more relevant prices you can compare, the more opportunities you may find.
No. Arbitrage betting can be completed using bookmakers alone, but a betting exchange can provide additional opportunities and potentially more competitive prices. If you use an exchange, you also need to consider liquidity and commission.
Yes, but manually comparing odds across multiple bookmakers can be slow and increases the chance of calculation errors. Specialist arbitrage software can scan markets, identify potential opportunities and calculate the required stakes much more efficiently.
You generally need to act quickly because bookmaker odds can change at any time. If one price changes before all the required bets are placed, the original arbitrage opportunity may no longer exist.
Yes. Although arbitrage betting is legal in the UK, bookmakers can restrict customers or reduce maximum stakes based on their own commercial policies. This means an opportunity that appears profitable may not always be fully executable at the advertised stake.
Football and tennis are useful starting points because they offer extensive bookmaker coverage and frequent markets. Tennis match-winner markets can be particularly straightforward because they normally have two possible outcomes, while football's three-way markets require you to account for the draw.
No. The mathematical concept can produce a positive return when all bets are correctly placed at the required odds, but real-world risks remain. Odds can move, stakes can be restricted, exchange bets may not be fully matched, and mistakes can turn an apparent arbitrage into a loss.
Yes. The two strategies can complement each other, although they work differently. Matched betting focuses on converting sportsbook promotions, while arbitrage betting seeks to exploit differences in available odds.
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