What is Arbitrage Betting?

Arbitrage betting means placing bets on all outcomes of an event across different bookmakers at odds where the combined implied probabilities add up to less than 100%, guaranteeing a profit regardless of the result.

How arb betting works

Every set of odds implies a probability. Odds of 2.0 implies 50%. Odds of 3.0 implies 33.3%. Add up the implied probabilities for all outcomes of an event and you normally get more than 100%. That excess is the bookmaker's margin.

An arbitrage exists when the implied probabilities across different bookmakers add up to less than 100%. Because each bookmaker sets its own odds independently, one book might be generous on the home win while another is generous on the away win. The gap between them can create a combined implied probability below 100%, meaning you can cover all outcomes and lock in a profit.

The profit is small, usually 1-5%, but it is guaranteed regardless of what happens in the match.

A simple arbitrage example

Team A vs Team B. Bookmaker 1 offers 2.20 on Team A winning. Bookmaker 2 offers 2.20 on Team B winning.

Implied probability: 1/2.20 + 1/2.20 = 45.5% + 45.5% = 91%. That is below 100%, so an arb exists.

With a total stake of £100, you split it proportionally. Each leg gets £100 / (odds × implied sum) = £100 / (2.20 × 0.91) = £50 on each side.

If Team A wins: you collect £50 × 2.20 = £110. You've profited £60 from this bet, and lost £50 from the team B to win bet, so profit is £10. If Team B wins: same result. £110 collected, £100 staked, £10 profit.

The profit percentage is 10% on this example, which is unusually large. Most real arbs return 1-3%.

Two-way vs three-way arbs

Two-way arbs cover two outcomes: win or lose (tennis, basketball, American sports). Three-way arbs cover three outcomes: home win, draw, away win (90-minute football and other sports with draws).

Three-way arbs are more complex because you need three separate bets, each at a different bookmaker, to close all outcomes. The combined implied probability still needs to be below 100% across all three legs. More legs means more moving parts, and the window before one of the odds changes tends to be shorter.

VigBreak detects both two-way and three-way arbitrage opportunities and shows the stake split for each leg.

Risks and limitations of arbitrage

Arbitrage is not risk-free in practice, even though the maths guarantees a profit if all legs are placed at the advertised odds.

The main risks are:

Odds movement. Bookmakers update odds quickly. You might place leg 1 at 2.20 and find leg 2 has dropped to 2.05 by the time you try to place it. The arb disappears and you are left with a one-sided bet.

Account limits. Bookmakers limit or close accounts that consistently bet on arbs. Arb bettors are easy to identify because they back every outcome and always bet at the best odds. Expect accounts to be restricted over time.

Operator refusals and voids. Some bookmakers have terms allowing them to void bets that form part of an arb, or to limit stakes after the fact. This is more common at some books than others.

Minimum stakes. Some arbs require very small stakes on one leg, below what a bookmaker will accept.

VigBreak logs every arb signal with a timestamp before the event starts. You can see on the stats page how the arb signals have performed as a group.

How to find arb opportunities

Finding arbs manually means constantly checking odds across dozens of bookmakers for the same event. It is possible but slow. The window before odds are corrected is often minutes or less.

VigBreak monitors odds across major UK and European bookmakers in real time and surfaces arbitrage signals the moment they appear. Each signal shows the two or three legs, the bookmakers, the odds, the profit percentage, and the stake split.

You can see all current and historical arb signals on the signals page, filtered by type.

View live arbitrage signals on VigBreak | Public track record