What Is Arbitrage Betting?

TL;DR: Arbitrage (“arbing”) means betting every side of a game across different books at prices that lock in a small, risk-free profit no matter who wins. It's real, but thin, fast-moving, and can get your accounts limited.

Arbitrage exists when two sportsbooks disagree enough that you can back all outcomes and come out ahead regardless of the result. Split your stake across the sides in the right proportions and the wins cover the losses with a little left over.

How an arb works

It happens when the combined implied probability of every outcome adds up to less than 100%. You stake each side in proportion to its price so all outcomes return the same amount. Our arbitrage calculator checks whether an arb exists and splits the stakes for you.

Why arbs are hard to keep

The edges are tiny (often 1–3%), they vanish within minutes as books correct, and you need accounts at several books with cash in each. Worse, books watch for it — consistent arbing tends to get your limits cut. The math is risk-free; the practical grind is anything but.

Arbitrage vs a true edge

Arbitrage profits from books disagreeing with each other. A model profits from the book disagreeing with the true line — a genuine, repeatable expected-value edge rather than a fleeting price gap. Both rely on getting the best number, which is why line shopping underpins each.

An edge you can repeat

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