The Arbitrage Calculator spots situations where pricing differences between sportsbooks let you cover every outcome of a market and lock in a guaranteed profit, regardless of which side wins. Enter the best available odds for each outcome — 2-way (head-to-head sports like tennis), 3-way (soccer with Win/Draw/Loss), or 4-way — plus your total stake, and the calculator returns the optimal individual stake per leg, the per-book payout if that leg wins, and the net profit (or, if the market overround leaves no edge, the percentage shortfall).
Arbitrage opportunities are typically small (often 0.5%–3% on liquid markets), short-lived (sportsbooks correct mispricings within minutes), and require accounts at multiple books. The calculator does the math; finding the lines and executing them quickly is the bettor's job. The expandable per-leg P/L breakdown shows exactly what happens at each book across every possible outcome.
To convert odds between formats before plugging them in, see the Odds Converter. For free-bet and lay-side mechanics related to arbitrage, see the Matched Betting Calculator.