Arbitrage Betting Calculator
Check for an arbitrage opportunity and split your stake for a guaranteed profit
Frequently Asked Questions
Arbitrage betting (arbing) means placing bets on every outcome of an event at odds from different sportsbooks that combine to guarantee a profit no matter which outcome wins. It's possible when the combined implied probability across books is under 100%.
Convert each side's odds to implied probability and add them together. If the sum is less than 100%, an arbitrage opportunity exists — the gap below 100% is roughly your guaranteed profit margin.
Each side's stake is proportional to its implied probability: Stake = Total investment × (that side's implied probability ÷ sum of all implied probabilities). This splits your money so the payout is identical regardless of the outcome.
Real arbitrage opportunities are usually tight, typically 1-5% — big price discrepancies between sportsbooks get corrected quickly. The advantage compounds over many bets rather than from any single large win.
It's not illegal, but most sportsbooks discourage it and may limit stake sizes or close accounts they suspect of consistent arbitrage betting, since it guarantees the book a loss on that event.
How the arbitrage calculation works
Each side's American odds are converted to implied probability. If the two probabilities add up to less than 100%, a guaranteed-profit arbitrage exists. Each stake is set proportional to its own implied probability divided by the combined total, so the payout comes out identical no matter which side wins.