Implied Probability 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

The chance of an outcome as expressed by its odds, including the bookmaker's margin.

Odds and probability carry the same information in different notation. American odds of −150 mean risking $150 to win $100, which implies the bet wins 60% of the time. Convert with −odds ÷ (−odds + 100) for negative prices, and 100 ÷ (odds + 100) for positive ones.

Full definition of implied probability →

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 →