Arbitrage Calculator
Calculate your guaranteed profit from arbitrage betting opportunities
Less work, more wins
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How It Works
Arbitrage betting guarantees profit by placing bets on all possible outcomes of an event across different bookmakers. Enter the odds for both outcomes and your total stake to calculate guaranteed returns.
Find Different Odds
Find an event where different bookmakers offer different odds on opposite outcomes
Enter the Odds
Input the odds for both outcomes in your preferred format
Calculate Stakes
The calculator shows how much to bet on each outcome for guaranteed profit
What is arbitrage betting
Most bettors lose because they're guessing. Arbitrage betting flips that script — it's a mathematical approach that removes the gamble and locks in profit before a single game starts.
Think of arbitrage as exploiting disagreement between bookmakers. Each sportsbook sets its own odds based on their risk models and customer betting patterns. Sometimes these numbers drift apart enough that you can bet both sides of the same game at different books and guarantee a return. It's not gambling at that point—it's math. When Bookmaker A offers +150 on Team X and Bookmaker B has -120 on Team Y, that gap might be your window. The key is spotting when the combined implied probability drops below 100% — that's when profit becomes certain regardless of who wins.
Our calculator does the heavy lifting so you don't have to pull out a spreadsheet. Enter the odds from two different sportsbooks, input your total bankroll, and it instantly shows you exactly how much to place on each outcome. No guesswork about stake sizes. The tool supports American, decimal, and fractional odds because we know different books display them differently. Whether you're working with $100 or $10,000, the math stays the same — the calculator just scales your bets to maximize that guaranteed return.
Arbitrage opportunities don't last long. Odds shift constantly based on betting volume, breaking news, and bookmaker adjustments. When you spot a profitable arb, you've got minutes (sometimes seconds) to place both bets before the window closes. That's why having a calculator ready matters — you need to know your exact stakes immediately. The longer you wait, the more likely one side moves and your guaranteed profit vanishes.
This free tool handles two-way markets perfectly, but arbitrage gets more interesting with three-way markets (like soccer) and live betting scenarios. If you're serious about arbitrage betting, you'll want real-time alerts when opportunities appear rather than manually checking dozens of sportsbooks. That's where BetSmarter's premium tools come in—we scan thousands of games across multiple bookmakers and alert you the moment profitable arbs emerge. Less hunting, more winning.
Frequently Asked Questions
Arbitrage in sports betting is when you place bets on all possible outcomes of an event across different bookmakers at odds that guarantee profit regardless of the result. It exploits price differences between sportsbooks, turning betting into a mathematical certainty rather than a gamble. When bookmakers disagree on the true probability of outcomes, the gap creates a risk-free profit opportunity.
Arbitrage is calculated by converting odds to implied probabilities and checking if they sum to less than 100%. For example, if Bookmaker A offers 2.10 odds (47.6% implied probability) and Bookmaker B offers 2.20 odds on the opposite outcome (45.5% implied probability), the total is 93.1%—meaning a 6.9% guaranteed profit exists. The calculator then determines the exact stake distribution to lock in that profit.
Enter the odds from two different bookmakers for opposite outcomes of the same event, then input your total stake amount. The calculator instantly shows you how much to bet on each side to guarantee profit. Make sure to place both bets quickly before odds change, and verify both bookmakers accept your stake sizes. The tool handles all odds formats so you can compare prices across any sportsbook.