Arbitrage calculator. Guaranteed profit, whatever lands.
When different books price the same event generously enough, backing every outcome locks in a profit no matter the result. Enter the best price for each outcome and your stake to see if an arb exists and exactly how to split the money.
Outcomes & odds
Spread across every outcome
Best price at any book
Best price at any book
Use the best available price for each outcome, ideally from different books. If the implied chances sum below 100%, a guaranteed margin exists.
Stake split
How it works
- 01
Add up the implied chances
Convert each best price to an implied probability (1 ÷ odds) and sum them. The total is the market percentage, the book's overround when you bet at one place.
- 02
Under 100% is an arb
If the best prices across different books sum to less than 100%, the market is mispriced in your favour and a guaranteed profit exists. The further below 100%, the bigger the margin.
- 03
Split the stake to equalise
Stake on each outcome in proportion to its implied chance so every result returns the same amount. The calculator gives you the exact split and the guaranteed profit.
Bestbet is a research and price-discovery service, not a bookmaker. We don't accept wagers or hold funds. These calculators are informational, you place any bet yourself with your own bookmaker or exchange. You must be 18 or over. Please gamble responsibly. SA National Responsible Gambling helpline: 0800 006 008.