What is an arbitrage / arb in sports betting?
The short answer
Exploiting odds differences to guarantee profit regardless of outcome.
Watch the lesson
Play the Arbitrage / Arb videoBetting strategy guide
Knowing the language is step one — knowing the true price is the edge. The Cold Line’s signal desk tracks the no-vig fair number and the closing-line value behind terms like this, before the market moves.
In plain English
Finding two books with different odds where you can bet both sides and always win. Rare!
What to remember about Arbitrage / Arb
The definition
Exploiting odds differences to guarantee profit regardless of outcome.
In plain English
Finding two books with different odds where you can bet both sides and always win. Rare!
Example in context
One book had the dog at plus one fifty-five while another had the favorite at minus one forty — that gap is an arb.
Check yourself
Term quiz
Check yourself: Arbitrage
1.Arbitrage is…
2.One book has the dog at +155 while another has the favorite at −140. Why might that be an arb?
3.What is the main practical obstacle to arbitrage?
Keep learning
Explore the next question before you place a bet.
- What does chasing mean in gambling?
- What is CLV (closing line value) in sports betting?
- What is a contrarian in sports betting?
- What is expected value (EV) in sports betting?
- What is the gambler's fallacy in gambling?
- What does handicapping mean in sports betting?
- What is a hit rate in sports betting?
- What does line shopping mean in sports betting?
Put the concept to work
Explore Arbitrage / Arb with a concrete research workflow. Build your own number, compare sportsbook prices with a sharp reference, or use Audits to review timestamped book moves beside play-by-play.
Browse the full A–Z betting glossary or read the complete betting guide. The Cold Line also publishes a free year-round sports calendar and an odds board (Free account: delayed odds).