Arbitrage Finder
The Arbitrage Finder scans live sportsbook odds for sports betting arbitrage opportunities across moneyline and over/under totals markets. Use it to find rare spots where betting every outcome can lock in a guaranteed return. Review each arbitrage bet, confirm the prices at the books, then use the stake percentages to split your bankroll across the required legs.
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How Linewhale finds arbitrage opportunities
An arbitrage opportunity exists when the best available odds across sportsbooks imply less than 100% total probability after covering every possible outcome. For a two-way market, Linewhale compares the best price on both sides and adds their inverse decimal odds.
Arbitrage exists when: 1 / best side A odds + 1 / best side B odds < 1
If the total is below 1, the difference can be converted into a guaranteed profit percentage and a recommended stake split. The smaller the combined implied probability, the larger the arbitrage margin.
Example arbitrage calculation
Suppose one sportsbook lists Team A at +110, which is 2.10 in decimal odds, and another lists Team B at +105, which is 2.05 in decimal odds. The combined inverse probability is 1 / 2.10 + 1 / 2.05 = 0.9646. Because that number is below 1, the two prices create a theoretical arbitrage.
The guaranteed return is calculated as 1 / 0.9646 - 1, or roughly 3.67%. Stake sizing then allocates more money to the lower payout side and less to the higher payout side so either result returns the same profit.
Why arbitrage lines disappear quickly
Sportsbook prices move constantly. A stale line, delayed market update, injury report, lineup change, or sharp book move can create a short-lived gap between books. Those gaps often close quickly once sportsbooks update their numbers.
Treat every listed opportunity as time-sensitive. Confirm each price, market, point, and stake limit at the sportsbook before betting both sides.
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Convert between American, decimal, fractional, and implied probability
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Find the optimal stake split and guaranteed profit for any 2-way arb
Frequently asked questions
What is sports betting arbitrage?▾
Sports betting arbitrage (also called "arbing" or "sure betting") is placing bets on all possible outcomes of an event across different sportsbooks such that you guarantee a profit regardless of the result. It works because different books sometimes set odds that, combined, imply a total probability below 100%.
Is arbitrage betting legal?▾
Yes — arbitrage betting is legal in every US state where sports betting is permitted. It is not cheating; you are simply taking advantage of pricing differences between licensed sportsbooks. However, books may limit or close accounts of bettors who arb frequently.
How much profit can you make from arbitrage betting?▾
Most arbitrage opportunities offer between 0.5% and 5% guaranteed profit. The limiting factor is stake size — you need accounts funded at multiple books and must act quickly before lines move. Full-time arbitrage bettors can generate consistent returns but need significant bankrolls.
Why do arbitrage opportunities disappear so quickly?▾
Sportsbooks monitor each other's lines and adjust quickly. When a sharp book moves a line, softer books often follow within minutes. Linewhale refreshes odds every minute — always verify prices at the book before placing your bets.