Arbitrage Calculator

Arbitrage, or a surebet, means backing every outcome of a market at different bookmakers so you profit whatever happens. It is only possible when the sum of 1 ÷ odds across all outcomes is below 1.

In most countries it is legal, because you are using public prices and your own money. Bookmakers often limit or close accounts they see doing it, so check each site's terms.

Odds can change before your second bet is placed, a bookmaker can cancel a bet it calls a pricing error, and stake limits can stop you betting the full amount. Margins are usually small, around 1–3%, so one mistake can wipe out many wins.