Arbitrage Calculator
Enter the best odds for each outcome and your total stake. The calculator splits the stake so every outcome pays the same, and shows whether the prices form a surebet. Live surebets across 100+ bookmakers are on the surebets page.
FAQ
What is an arbitrage bet (surebet)?
An arbitrage bet backs every outcome of one market at different bookmakers whose prices disagree so much that the stakes can be split to return the same amount whatever happens — more than the total staked. It exists when the inverse odds of the best price for each outcome add up to less than 1.
How are the stakes calculated?
Each outcome gets the total stake times (1 / its odds) divided by the sum of all inverse odds. Every outcome then pays the same amount: the total stake divided by that sum.
What about exchange commission?
Exchanges such as Betfair, Smarkets or Matchbook take a commission on winnings. Enter it per outcome and the calculator uses the net odds, 1 + (odds − 1) × (1 − commission).
What are the risks?
Prices move within seconds, so one leg can change before you place the other; a bookmaker can void a bet at an obvious error price; and soft bookmakers limit accounts that bet arbitrage regularly. Place the leg most likely to move first.