Arbitrage (Sure Bet) Calculator
Check whether prices at different bookmakers add up to a guaranteed profit, and how to split your stake.
Odds are entered in decimal format. Use the odds converter for American or fractional prices. Results are estimates for planning, not advice.
How it works
Add the implied probabilities (1 ÷ odds) of the best available price on each outcome. If the total is below 100%, backing every outcome in the right proportions returns more than you staked, whatever happens.
Worked example
At 2.10 and 2.05 the total is 96.4%. Splitting 100 as 49.40 and 50.60 returns 103.73 either way: a 3.73 profit.
Reality check
True arbitrage is rare and short-lived. Prices move while you place the second bet, stake limits bite, and bookmakers restrict accounts that do it routinely. Different rules for voided bets between two books can also turn a sure thing into a loss, so read the settlement rules first.