How Radius works

Do restaurant grades actually predict food safety?

What a letter grade, score, or pass/fail result can and can't tell you about whether you'll get sick — and how to read them honestly.

Updated Jul 9, 2026

A restaurant grade is a useful signal, but it's easy to over-read. Here's an honest look at what an inspection result does and doesn't tell you.

What a grade is

An inspection is a snapshot: what an inspector observed on one specific day. A good grade means the place met the standard at that visit. It is not a guarantee about the meal you'll be served next week.

Grades don't mean the same thing everywhere

  • New York City uses letter grades A/B/C, where fewer points is better (A is 0–13 points).
  • Chicago reports Pass, Pass with Conditions, or Fail — not a grade.
  • San Francisco publishes a 0–100 score where higher is better.

Because scoring is different in every city, Radius normalizes each city's result into a consistent format — but always shows the original official grade or score, and never invents one.

How to read a grade honestly

  • Look at trend, not just the latest result — is the place improving or slipping?
  • Weight repeated critical violations more than a single one.
  • Check how recent the inspection was; an old inspection tells you less about today.
  • Remember the absence of a problem on record isn't a guarantee of safety.

That's the whole idea behind Radius: take the official record, explain it in plain English, and be honest about its limits — never overselling a grade or hiding a bad one.

Frequently asked

Does an A grade guarantee I won't get sick?
No. A grade reflects conditions at one inspection on one day. It's a helpful signal, especially alongside the inspection history and violation trend, but it can't guarantee any individual meal is safe.
Why not just show one universal score for every city?
Because cities measure different things in different directions, a single invented score would be misleading. Radius normalizes results for comparison but always shows each city's real, official grade or score.

Check before you eat — get Radius at launch

Restaurant grades, violations, and food recalls, explained in plain English. Join the waitlist for early access.

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