⚖ Arbitrage Calculator
Find sure-bet opportunities across bookmakers. Calculate optimal stakes for 2-way and 3-way arbs and the dutching calculator for equal profit.
Dutching lets you back several outcomes so you profit equally whichever wins. Enter up to 4 outcomes.
- Account restrictions: Bookmakers actively monitor for arb bettors and will restrict or close accounts — often without warning.
- Odds movement: Between placing both sides, odds can change — eliminating the arb or creating a loss.
- Maximum stakes: Bookmakers may not accept your full required stake, leaving one side uncovered.
- Settlement disputes: Voided bets, rule 4 deductions (horse racing), or settlement errors can unwind a locked-in profit.
- Withdrawals: Bookmaker withdrawal delays or bonus wagering requirements can complicate profit extraction.
How Sports Arbitrage Works
Sports arbitrage (arbing or sure betting) exploits pricing differences between bookmakers. Because different bookmakers set odds independently, there are occasional windows where the combined implied probability of all outcomes is below 100% — creating a guaranteed profit opportunity.
How to Find Arbs
- Compare odds across multiple licensed bookmakers for the same event.
- Calculate the sum of inverse odds (1/odds) for all outcomes. If the total is below 1.00, an arb exists.
- Calculate your optimal stakes: stake proportional to 1/(odds × arb%) for each outcome.
- Place bets quickly — arb windows close fast as bookmakers update prices.
Dutching vs Arbitrage
Dutching does not guarantee profit — it guarantees equal profit (or loss) whichever of your backed outcomes wins. It is used when you want exposure to multiple outcomes from a single bookmaker at a target profit level, or when you think one bookmaker's field is mispriced and want to cover multiple runners.