Arbitrage Calculator
Find guaranteed profit across 2 or 3 outcomes. Calculate exact stakes for any bankroll.
Enter odds for each leg to check for arbitrage.
Frequently asked questions
What is arbitrage betting?
Arbitrage betting (an "arb") is backing every outcome of a market at different sportsbooks so the combined odds guarantee a profit no matter who wins. It happens when books disagree enough that the implied probabilities add up to less than 100%.
How do you calculate an arbitrage bet?
Convert each book's best price to implied probability and add them up. If the total is below 1.0, an arb exists and the profit is (1 ÷ total) − 1. This calculator then splits your bankroll across the legs so every outcome returns the same amount.
How do I split my stake across the legs?
Each leg gets a share proportional to its implied probability. Enter your total stake and the odds for 2 or 3 legs and the calculator shows the exact amount to bet on each outcome to lock in the profit.
Is arbitrage betting legal?
Arbitrage betting is legal, but sportsbooks dislike it and may limit or close accounts of bettors they identify as arbers. Arbs also disappear quickly, so the main practical challenge is placing both legs before a line moves.