Arbitrage Calculator

How to use it

Change any input and the results update immediately. The values are also written into the address bar, so you can bookmark a calculation or paste the link to someone else and they will see exactly the same numbers.

Everything here computes with the same functions that produce the grades inside WeBall, so a number on this page will never contradict a number on a bet card.

What the term means

Betting both sides at different books at prices that guarantee a profit whatever happens.

When two sportsbooks disagree enough that the implied probabilities of both sides together add up to less than 100%, backing both in the right proportion locks in a profit regardless of the result.

Full definition of arbitrage →

Learn the math behind it

A calculator is faster than doing this by hand, but knowing why the formula works is what lets you spot when a number is wrong. Read the full guide →