What Is Arbitrage Betting?

Arbitrage betting is the practice of placing bets on every possible outcome of a sporting event across different bookmakers so that you make a profit regardless of the result. It works because different bookmakers price the same event differently. When the gap is wide enough, you can bet on every outcome and still lock in a profit. The strategy is also called arbing, sure betting, or miracle betting.

Arbitrage betting is a beneficial strategy because it…

• guarantees profit regardless of the result

• doesn’t require sporting knowledge or in-depth analysis

• works across almost any sport, league, or market type

How Does Arbitrage Betting Work?

The way it works is to simply find two or more bookmakers whose combined odds leave a margin in your favour, split your stake across each outcome, and pocket the difference. An opportunity exists if the combined implied probability of all outcomes is below 100%. The further below 100%, the bigger the profit.

Formula for implied probability: (1 ÷ Decimal Odds) x 100

For instance, for a Chiefs–49ers game, you might see Chiefs at 2.10 with Bookmaker A and 49ers at 2.20 with Bookmaker B.

• Chiefs' implied probability =  (1 ÷ 2.10) x 100 = 47.62%

• 49ers implied probability = (1 ÷ 2.20) x 100 = 45.45%

• Combined implied probability: 47.62% + 45.45% = 93.07% 

The combined probability for opposing outcomes with the two bookmakers is less than 100%. You can place calculated bets and be guaranteed a profit regardless of the result. That opportunity is called an "arb".

You can calculate the exact stakes needed to lock in guaranteed profit across two or three bookmakers by using a free arbitrage calculator.

Why arbs exist in sports betting

Arbs are the result of price discrepancies across two or more bookmakers, and they can happen because of any of the following reasons:

• Algorithmic errors: Bookmakers make mistakes in their automation process, leading to incorrect odds, delays, and overcompensation.

• Fast market changes: Odds change quickly and, sometimes, a few bookmakers can’t keep up. This is especially common in in-play markets.

• Human errors: People make mistakes, even experienced bookies.

• Market imbalance: Too much money coming in on one side of a market can cause the odds to move unevenly.

Bookmaker promotions: Bookies sometimes offer odds boosts that create arb opportunities where none would have existed.

Arbitrage Betting Examples

Here are a few examples to help you understand how arbitrage betting actually works.

1. Two bookmakers are pricing the same game differently

This is the most common type of arb. In this case, two bookies have different odds on the same dart game at the same time, and the gap is wide enough to cover both sides profitably.

For instance, Betfair has Adam Mould to win at 1.70, and Unibet has Steve Green to win at 2.48. Both bookies are pricing their side generously (99.14% combined probability), and that gap is your opportunity.

You put $60 on Adam at Betfair and $41 on Steve at Unibet. The total outlay is $101.

• If Adam wins, Betfair pays you $102, a $1 profit.

• If Steve wins, Unibet pays you about $102, a $1 profit.

Whoever wins, you're up $1 on a $101 outlay. That's a 1% return, locked in before the game starts.

These opportunities open up most often on early lines, before books start copying each other's pricing, so they don’t last very long.

2. Two bookmakers disagree on a player prop

When it comes to player props, there's no central place for bookies to compare prop lines, which means discrepancies show up more often and stay open longer.

Say you're looking at an AFL market for total disposals by a key midfielder. Dabble has the over/under set at 19.5, with the over priced at 2.18. PointsBet also sets the line at 19.5, but has the under at 1.87.

You bet $99.50 on the over at Dabble and $116 on the under at PointsBet. The total outlay is $215.50.

• If the player goes over 19.5 disposals, Dabble pays approximately $217, a $1+ profit.

• If the player goes under, PointBet pays approximately $217, a $1+ profit.

Either way, you're guaranteed at least $1 on $215.50 staked just by shopping the line across two books.

3. A line moves in your favour after your first bet

This one is slightly different because you're not placing both bets at the same time, so it's not a guaranteed arb from the start. But when the line moves the right way, you can turn a single bet into a locked profit.

Say the Cronulla-Sutherland Sharks open at 1.86 for an NRL clash, and you put $100 on them early in the week. Solid value at the time.

By game day, heavy public money comes in and the opposing team, the Manly Sea Eagles, is now priced at 2.22, enough to arb your previous bet.

You bet $84 on the opposition at 2.22, which would return $186 if they win.

• If the Cronulla-Sutherland Sharks win, your original bet returns $186, leaving you up $2 after the $84 hedge.

• If the opposition wins, the $186 return covers your $184 total stake, leaving you up $2.

You've guaranteed a profit on a bet you originally placed for different reasons.

Does Arbitrage Betting Actually Work?

Yes, arbitrage betting works. Unlike most betting strategies, the profit is determined before you place a single dollar. As long as you get both (or all) legs of the bet on at the right odds, you can't lose.

If you’re using an arbitrage betting software like Betsniper, you can find about 20 arbitrage opportunities available per day. At an average 2% ROI on $200 staked per bet, that works out to around $29,200 in annual profit, without having to predict any results.

Real bettors have backed this up in practice. One Betsniper user documented clearing over $20,000 in a single month during the NBA season, averaging around $2,000 per week across 50 to 100 bets per day. 

His strategy in his own words:

"Don't be greedy, play the long game, limit your bets, and take advantage of good opportunities."

Below were his winnings tracked through the Betsniper Bet Tracker.

Limitations

That said, there are still some limitations to understand before getting started.

• Profit margin per bet is relatively small. Returns typically range from 1% to 5%. You need volume and a decent bankroll to turn those margins into meaningful income.

• Bookmakers monitor for arbing behaviour and will limit or close accounts they identify as doing it. This is one of the most common challenges affecting scalability. We'll cover how to avoid restrictions and maintain scalability later in this post.

• Manually searching for arbitrage bets is not realistic, as you would have to scan multiple bookmakers across hundreds of markets by hand. Paying for betting software is a core part of the strategy.

What are the Best Sports for Arbitrage Betting

If you’re looking to maximise your chances of securing arb bets, you should focus on these sports.

• Football: It’s a widely popular sport with hundreds of competitions and betting markets. The wider the market, the greater the chances of price discrepancies. 

• Basketball: It’s also incredibly popular worldwide and offers a large number of tournaments and markets.

• Horse Racing: The odds market for horse racing is incredibly volatile, making it a perfect destination for arb finders.

Tennis: This sport has only two possible outcomes (win or loss). For beginners, it’s easier to follow than most sports.

How to Find Arbitrage Betting Opportunities

Generally, if the sum of the implied probabilities for all opposing outcomes is less than 100%, an arbitrage opportunity exists. The difference below 100% represents your guaranteed profit margin. Let’s explore the most effective methods to find such opportunities.

1. Use an arbitrage scanner

Using an arbitrage scanner is by far the most efficient way to go about arbing. Betsniper's Arbitrage Finder scans live odds across Australian bookmakers simultaneously and flags opportunities instantly, showing the bookmakers, suggested stakes, and guaranteed profit.

2. Line shop

You can find arbitrage opportunities manually by checking odds across bookies for the same event. It's slow, and most windows will close before you act, but it's a useful way to understand how arbs form.

For example, a punter checks different bookmakers' odds for the same WNBA game: Dallas Wings vs. Las Vegas Aces.

In the image below, there is a clear arb opportunity from backing the Dallas Wings at 2.82 on Sportsbet and the Las Vegas Aces at 1.57 on Ladbrokes. That’s because the sum of their implied probabilities is 99.15% (35.46% + 63.69%), which is less than 100%.

We recommend that you use an odds comparison screen for faster and more effective line shopping.

3. Target soft vs. sharp pricing gaps

The widest discrepancies in odds tend to appear between soft bookmakers (which most Australian retail books are) and sharper pricing sources. When a soft book is slow to adjust after sharp money has moved the market elsewhere, a window opens. Use our tool to compare odds against Pinnacle, known as the sharpest bookmaker in the world.

4. Focus on niche markets and early lines

Major AFL and NRL head-to-head markets are traded heavily and corrected quickly. Player props, lower-division football, and early-week lines tend to stay mispriced longer, giving you more time to act.

5. Leverage boosts and promotions

Bookmakers regularly offer odds boosts that push certain prices above their true value. When a boosted price on one bookmaker combined with a standard price on another creates a market below 100%, that's an arb opportunity worth taking.

In the image below, Bookie A’s odds boost promo for a Sydney Roosters win creates an unexpected arb opportunity for bettors who choose Perinth Panthers on Bookie B. The original 2.00 price wouldn’t have been enough for a sure bet without the boost to 2.25.

Betsniper’s Boost Analyser lets you check if sportsbook boosts and specials offer real value.

Common Arbitrage Betting Strategies

If you want to improve your sure betting, you can try some of the following.

Sniping

Arb windows are short (often seconds to minutes). Bookmakers adjust the moment they see movement on one side. Speed is the difference between locking in a return and missing it entirely. Here’s how to snipe effectively:

1. Subscribe to an arbitrage betting tool

2. Turn on alerts on mobile app or Discord

3. Place bets as soon as you receive the alert. (Note: confirm that odds haven’t changed before betting.)

Live arbitrage

During in-play betting, odds move constantly as the game is being played. Bookmakers don't always react at the same speed, which means pricing gaps open up between them more often than in pre-match markets. When you spot one, you need to move quickly. Unlike pre-match arbs, which can sit for hours, live arb opportunities can disappear within seconds as bookmakers catch up with each other. There are several arb tools that find in-play opportunities with alerts.

Exchange arbitrage

Instead of backing both sides across two bookmakers, you back an outcome at a bookmaker and lay the same outcome on a betting exchange like Betfair. If the bookmaker's odds are high enough relative to the lay odds on the exchange after accounting for commission, the numbers work out to a guaranteed profit. Here’s how to do it:

1. Find a high bookmaker price (e.g., Melbourne Storm to win at 2.20).

2. Find a lower lay price on an exchange for the exact same market (e.g., lay Melbourne Storm at 2.00).

3. Calculate lay stake: bookmaker odds × bookmaker stake ÷ exchange lay odds

4. Check your exchange liability: lay stake × (lay odds − 1). You’ll need that amount available on the exchange to cover the possible loss.

5. Place both bets quickly and as close together as possible.

Bonus bet conversion

This strategy uses arbitrage betting to convert welcome offers, bet-back credits, and other types of bonus bets into actual, withdrawable cash. It involves placing your bonus bet at the bookmaker (the back bet), then placing an opposing bet on a betting exchange like Betfair (the lay bet). The method is also known as matched betting. Here’s how to do it:

1. Receive a bonus bet from a traditional bookmaker.

2. Find a 2-way market to bet on.

3. Check the lay odds for the same selection on an exchange. To maximise profit, you want the back and lay odds to be close.

4. Use a bonus bet converter to find the exact lay stake you need to place on the exchange.

5. Place both bets quickly and as close together as possible.

How to Avoid Restrictions in Arbitrage Betting

The best way to avoid getting flagged or penalised by bookmakers is to understand which betting behaviours are most likely to trigger their risk controls. Common triggers include:

• Consistent winnings with almost no loss

• Suspicious betting patterns

• Obvious arbitrage-style stake amounts, such as betting exactly $47.73

• Unusually large stakes on unpopular markets

• Multiple accounts owned by the same user

There are several ways to avoid account limitations.

Alternate between arbs and regular bets. If all of your bets are arbitrage-driven, your account is in jeopardy. Try to make a few normal bets in between. 

Round up your stakes. Approximate your stakes to whole numbers, like $50 instead of $47.73 or $100 instead of $99.82. Exact figures down to the cent are a red flag for bookies and can lead to account restrictions.

Is Arbitrage Betting Legal in Australia?

Yes. Arbitrage betting is completely legal in Australia. There’s currently no state or federal legislation that prohibits placing bets on all outcomes of a sporting event across different licensed bookmakers.

The main piece of national legislation is the Interactive Gambling Act 2001, which governs online betting in Australia. As long as you're betting with ACMA-licensed bookmakers and placing pre-match bets online, you're on the right side of the law.

What you do need to understand is that while arbing is legal, bookmakers are private businesses with their own terms and conditions. They can restrict or close accounts they identify as arbing, and many do. That's a commercial decision on their part, not a legal one.

Why is Arbitrage Betting Popular in Australia?

Australia boasts a massive, competitive sports betting market featuring thousands of legal, regulated bookmakers. The country also has a vibrant sports culture, with most of the population focusing on football (AFL), rugby (NRL), soccer, cricket, basketball, and tennis. A lot of the favourite sports in Australia are particularly suited for arbitrage betting.

In 2022, Australia became the country with the largest gambling losses in the world. Since then, a lot of Aussie bettors have shifted to low-risk and risk-free sports betting strategies, including arbitrage betting.

Bottom Line

Sure betting is one of the few strategies in sports betting where the profit is guaranteed even before you place a bet. The process is repeatable, and it doesn't depend on your knowledge of the sport or the outcome of any individual game.

The actual challenge is finding opportunities fast enough, placing both sides before odds move, and protecting your accounts over time. That's where the right tools make the difference.

Betting software like Betsniper offers tools that scan the Australian and global market in real time, so you're always early to arbitrage opportunities. Pair that with the Arb Calculator to size your stakes correctly and the Bonus Bets tool to extract additional value from promotions, and you have a complete arbing setup in one place.