SEO Report Tools

Webmaster Utilities · Runs in your browser · Free

Core Web Vitals Rating Checker

Rate your LCP, INP and CLS values against Google's Good / Needs improvement / Poor thresholds.

What this tool does

Takes metric values from PageSpeed Insights or Search Console and shows which band each falls into, using Google's published thresholds.

Who should use it

Developers and SEOs interpreting performance reports.

How it works

Good boundaries are LCP ≤ 2.5 s, INP ≤ 200 ms and CLS ≤ 0.1; Poor begins above 4 s, 500 ms and 0.25. Values between are Needs improvement.

How to use it

  1. Enter or paste lcp in the form.
  2. Adjust the options below the main box if you need to; the defaults suit most cases. Use "Load example" to see how input should look.
  3. Press the run button. Processing happens instantly in your browser.
  4. Review the result panel, then copy or download the output if the tool offers it. Use Reset to start over.

Practical example

LCP 3.1 s falls in Needs improvement.

Understanding the results

Google assesses Core Web Vitals at the 75th percentile of real-user data over 28 days.

Limitations

A single lab measurement does not represent field data. The tool does not measure anything itself.

Accuracy and report transparency

Results are computed in your browser from exactly what you enter. Deterministic steps (counting, parsing, encoding, validation) are verified by an automated test-suite with known answers. Where a method is a heuristic, the result panel says "estimated". No external data is used and nothing is invented.

Privacy

Your input never leaves your device for this tool. We count anonymous events (tool opened, run, copied) without storing what you typed. See the Privacy Policy.

Try these next

Page Experience AnalyzerRun Google's PageSpeed Insights (Lighthouse + real-user data) and fall back to local HTTP signals if the API is unavailable.Server Response Time CheckerMeasure connect time, time to first byte and total time over three requests.Page Size CheckerMeasure a page's HTML size and the sizes of the first 20 files it references.

Frequently asked questions

Where do I find my real values?

Search Console's Core Web Vitals report and the field-data section of PageSpeed Insights.

Is my data sent to your server?

No. This tool runs entirely in your browser, so the text or files you enter stay on your device. We do record anonymous counts of how often each tool is opened or run (no input data) to see which tools are useful.

How accurate are the results?

Counting, parsing, encoding and validation steps are deterministic and covered by automated tests with known answers. Anything based on a heuristic is labelled "estimated" in the result panel.

Is this tool really free?

Yes. There is no account, limit or paid plan. The site is supported by advertising, which is disclosed on our Advertising Disclosure page.

References