Arbitrage Calculator

An arbitrage (or “sure bet”) exists when two books price the same market generously enough that backing every outcome guarantees a profit. Enter the best odds for each outcome to see if one exists and how to size each leg.

Total stake ($)

Odds — outcome 1

Odds — outcome 2

95.24%

Combined implied %

+5.00%

Arb ROI

+$5.00

Guaranteed profit

$50.00

Stake outcome 1

$50.00

Stake outcome 2

Arbitrage — guaranteed profit whatever the result.

HOW IT WORKS

The method.

What it does

It sums the implied probabilities (Σ 1/odds). Below 100% an arb exists: the calculator splits your total stake so every outcome returns the same amount — a profit whatever happens.

How to use it

Find the best available price for each outcome across different books, enter them, and stake exactly the amounts shown. The guaranteed return is identical on every result.

The catch

Arbs are small, short-lived, and books limit accounts that exploit them. Treat it as a discipline tool, not a get-rich scheme — and always bet responsibly.

Educational only — not betting advice. Calculators and simulations are illustrative; past results and simulated outcomes don’t guarantee future returns. Bet responsibly.

FAQ

Questions, answered.

An arbitrage exists when different bookmakers price the same market generously enough that backing every outcome guarantees a profit, whatever the result. Summing the implied probabilities gives a total below 100%.

You split your total stake in proportion to each outcome's implied probability so every result returns the same amount. This calculator does that for you — enter the best odds for each outcome and it shows the exact stakes.

Arbs are small, vanish in seconds as odds move, and bookmakers limit or close accounts that exploit them repeatedly. Treat arbitrage as a discipline exercise, not a guaranteed income — and always bet responsibly.