Arbitrage Calculator
Free arbitrage betting calculator.
Enter your odds, get exact stake splits and locked-in profit. Two-way, three-way, and live arb scanning across every US sportsbook.
How arbitrage betting works
Arbitrage (arbing) means placing simultaneous bets on every outcome of an event at different sportsbooks where the combined implied probability is under 100%. The math guarantees a profit no matter which side wins.
Example: Book A offers Team X at +110 (47.6%), Book B offers Team Y at +110 (47.6%). Combined implied probability is 95.2% — a 4.8% arb. Split stakes correctly and you profit regardless of result.
Using the Parlae calculator
Enter the American, decimal, or fractional odds for each side, plus your total bankroll. Parlae returns: stake per book, total return, guaranteed profit in dollars, and ROI %.
Live arbitrage scanner
The standalone calculator handles one-off math. The Parlae arb scanner monitors every market across DK, FD, MGM, Caesars, ESPN BET, Fanatics, and 15+ more — surfacing arbs as soon as books mispriced. Filter by sport, minimum profit %, and your linked books.
Frequently asked questions
How does an arbitrage calculator work?
It takes the odds from two or more sportsbooks on opposite outcomes and calculates the exact stake split that locks in profit regardless of which side wins. Parlae returns total stake, per-book stake, and guaranteed return.
Is arbitrage betting legal?
Yes, arbitrage betting is fully legal. Some sportsbooks limit accounts that arb consistently, so spread action across multiple books and avoid round-number stakes.
How much profit do arbs typically yield?
Most arbs return 0.5–2% of total stake. Larger arbs (3%+) usually involve stale lines or limited markets and disappear within minutes.
Do you also scan for live arbs?
Yes — the Parlae arbitrage scanner surfaces real-time two-way and three-way arbs across 20+ US sportsbooks, with one-click stake splits.