Core Web Vitals Test
Check available field Core Web Vitals and inspect Lighthouse lab results.
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Frequently Asked Questions
01What are Core Web Vitals?
Core Web Vitals are three metrics Google uses to measure user experience: LCP (loading speed), CLS (visual stability), and INP (interactivity). They are a confirmed ranking factor in Google Search.
02What is a good Core Web Vitals score?
Good field values are LCP at most 2.5 seconds, CLS at most 0.1, and INP at most 200 milliseconds. The assessment uses eligible field p75 measurements. LCP and CLS are required. If INP is unavailable, those two metrics can still establish the assessment.
03What's the difference between Lab and Field data?
Lab data is collected in a controlled environment (Lighthouse). Field data is from real users via the Chrome User Experience Report (CrUX). Field data is what Google uses for ranking, but lab data helps diagnose issues.
04Do Core Web Vitals affect SEO?
Yes. Core Web Vitals are a confirmed Google ranking factor as part of page experience signals. Pages that pass CWV may have a ranking advantage over those that don't, especially for competitive queries.