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Core Web Vitals Assessment Tool

Enter field or lab values for LCP, INP and CLS to see a clear assessment.

Current thresholdsMetric-by-metric statusPriority fixes
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Understand LCP, INP and CLS together

A page passes the Core Web Vitals assessment when all three metrics are in the good range at the 75th percentile of real visits. This manual assessment helps interpret values copied from PageSpeed Insights, Chrome UX Report, Search Console or another trustworthy measurement source.

Current good thresholds

LCP should be at most 2.5 seconds, INP at most 200 milliseconds, and CLS at most 0.1. Between good and poor thresholds means improvement is needed.

Fix the weakest experience first

Improve LCP through faster delivery and priority resources, INP by reducing long main-thread work, and CLS by reserving stable space for images, ads and dynamic elements.

Frequently asked questions

What are Core Web Vitals?+

Core Web Vitals are user-experience metrics. LCP measures loading, INP responsiveness and CLS visual stability.

What is a good LCP value?+

A good LCP is 2.5 seconds or less. Values above 4 seconds are considered poor.

What is a good INP value?+

A good INP is 200 milliseconds or less. Values above 500 milliseconds are considered poor.

What is a good CLS score?+

A good CLS score is 0.1 or less. Values above 0.25 are considered poor.

Should I enter lab or field data?+

Field data reflects real users and is preferred for Search assessment; lab data is useful for debugging.

Does one fast test mean the page passes?+

Not necessarily. Real-user assessment typically considers the 75th percentile across visits and device types.

Will good scores guarantee better rankings?+

No. Page experience matters, but relevance, usefulness and many other systems also affect Search.

How can I improve Core Web Vitals?+

Optimize the largest content, reduce main-thread JavaScript, reserve media dimensions and test changes with field data.

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