What Is Arbitrage Betting?
Arbitrage betting — often called "arbing" — is a strategy that exploits differing odds across bookmakers to guarantee a profit regardless of the outcome of a sporting event.
It works because different bookmakers set their own odds independently. Occasionally, the combined implied probability of all outcomes at different bookmakers falls below 100%, creating a gap you can exploit.
A Simple Example
Imagine a tennis match between Player A and Player B:
- Bookmaker 1 offers Player A to win at 2.10
- Bookmaker 2 offers Player B to win at 2.05
The implied probabilities are:
- 1/2.10 = 47.6%
- 1/2.05 = 48.8%
- Total: 96.4%
Because the total is under 100%, a guaranteed profit exists. By calculating stake sizes correctly and placing bets at both bookmakers, you lock in a profit no matter who wins.
Why Do Arbs Exist?
Bookmakers are competitors. They price markets independently, react to news at different speeds, and sometimes make outright pricing errors. These differences create brief windows — arb opportunities — that traders and bettors exploit.
Arbs are short-lived. As bookmakers notice money flowing in, they adjust their lines. Most arbs close within minutes.
Is Arbitrage Betting Legal?
Yes. Placing bets is legal in licensed jurisdictions. Arbitrage itself is not against any law. However, bookmakers do not like arbers and may restrict or close accounts that show arbing patterns. Managing your accounts carefully is essential for longevity.
How Much Can You Make?
Typical arb margins are small — 1% to 3% per opportunity. But with enough capital and a high volume of bets, arbers can generate consistent monthly returns.
The skill lies in finding opportunities fast, calculating stakes accurately, and managing bookmaker relationships to keep accounts active.