What Is Core Web Vitals? Meaning, Formula and Examples
Core Web Vitals explained in plain English: what it means, why it matters, how to calculate or apply it, a worked example and common mistakes.
Core Web Vitals: Google's metrics for loading (LCP), interactivity (INP) and visual stability (CLS). They measure user experience.
What Core Web Vitals means
Google's metrics for loading (LCP), interactivity (INP) and visual stability (CLS).
Why it matters
They measure user experience. Used alongside other metrics, it helps teams make better budget and strategy decisions.
How to calculate or apply it
Good: LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1
Worked example
A page with LCP of 1.8s passes LCP.
Common mistake to avoid
Optimising lab scores while ignoring field data.
Related terms
Conversion Rate
The percentage of visitors who complete a desired action.
A/B Testing
Comparing two versions to see which performs better.
Statistical Significance
Confidence that test differences are not due to chance.
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Frequently asked questions
Is Core Web Vitals the same for every business?
No. Good values depend on your industry, margins, goals and data quality. Compare against your own history first.
Where can I see Core Web Vitals?
Most values come from analytics, ad platforms, marketplace dashboards or your own sales records, depending on the metric.
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