Arbitrage Betting Calculator
Detect two-way arbitrage opportunities across bookmakers and calculate optimal stakes to guarantee a profit regardless of outcome.
Results
What is it?
Sports arbitrage ("arb") exploits pricing differences between bookmakers on the same event to guarantee a profit regardless of the outcome. When the sum of implied probabilities from two books falls below 100%, a risk-free profit window exists.
How to use
Enter the best decimal odds available for each of the two outcomes (e.g. Home Win and Away Win) from different bookmakers, then set your total stake. If the Total Implied Probability is below 100%, an arb exists and the calculator shows how much to place on each outcome to lock in profit.
Example scenario
Bookmaker A offers 2.10 on Team A; Bookmaker B offers 2.10 on Team B. Total implied = 47.6% + 47.6% = 95.2% — an arb exists. On a $1,000 total stake, place $500 on each outcome. Whichever team wins, you receive $1,050, securing a $50 guaranteed profit (5% ROI).
Pro tip
True arb opportunities rarely exceed 2–5% profit and disappear within minutes. Act quickly — bookmakers adjust lines rapidly. Accounts that repeatedly exploit arbs are often limited or closed by bookmakers. The biggest practical risk is line movement after you place your first bet. This is a mathematical/educational tool only.