Arbitrage Calculator
Split your total across both books in the amounts above and you profit no matter who wins. Real arbs are small, vanish fast, and can draw limits — but the math is guaranteed while the prices hold.
How arbitrage works
An arbitrage exists when you can back every outcome of a game at prices that add up to less than 100% implied probability. Spread your stake across the sides in the right proportions and you collect the same return no matter who wins — a guaranteed profit, locked at bet time.
The gaps appear when two sportsbooks price the same game differently. They're usually small, close fast, and chasing them can flag your account for limits. The math is airtight, but arbing is a grind, not a goldmine.
Arbitrage profits from books disagreeing with each other. Our model profits from the books disagreeing with the true line — a real expected-value edge rather than a fleeting price gap.
Frequently asked questions
What is arbitrage betting?
Arbitrage ("arbing") means backing every outcome of an event across different sportsbooks at prices that guarantee a profit no matter who wins. It exists when two books disagree enough that the combined implied probability falls below 100%.
How do I split my stake for an arb?
Stake each side in proportion to its implied probability so both outcomes return the same amount. This calculator does that automatically from your total stake and the two prices, and shows the guaranteed profit and ROI.
Is arbitrage betting worth it?
Real arbs are small (often 1–3%), disappear quickly, and can get your account limited if a book notices. The math is genuinely risk-free while the prices hold, but the practical edge is thin and the legwork is constant.