How the grade is built
Letters, not scores.
An overall grade only when it is earned.
Each of the five areas gets a letter from A to F. Found on Google, Found in AI answers and Easy to call or book are graded from the share of their checks that pass, each check weighted by how much it matters for a call or a booking in your kind of business; a check the scan could not see counts for nothing either way. Fast on a phone is graded from real-visitor data where Google publishes it, or else from a lab test on a throttled mid-range phone, labelled as such. Knows what is working is graded from the analytics the scan sees load. The overall grade weighs the five, with being easy to call or book counting most. It appears only when all five areas were measured; otherwise the report says why. And when the report lists a fix that needs work, the overall grade is never higher than B.
There is no score out of 100. A number that exact suggests a precision one scan of one page cannot have, and a letter says what an owner needs: how it looks, and what to fix first.