What replaced FID in Core Web Vitals?

First Input Delay (FID) was replaced by Interaction to Next Paint (INP) in March 2024. INP measures the latency of all user interactions throughout a page session, not just the first one, making it a more comprehensive responsiveness metric.

What are the Good thresholds for each metric?

LCP: at or below 2.5 seconds. INP: at or below 200 milliseconds. CLS: at or below 0.1. Values above the Poor cutoffs (LCP > 4 s, INP > 500 ms, CLS > 0.25) need immediate attention.

Do Core Web Vitals directly affect Google rankings?

Yes. Since the Page Experience update, Core Web Vitals are confirmed ranking signals. Reaching "Good" thresholds on all three metrics can provide a modest ranking boost, especially in competitive niches where content quality is otherwise equal.

Should I use lab data or field data to measure CWV?

Google uses field data (real-user measurements from the Chrome User Experience Report) for ranking purposes. Lab data from tools like Lighthouse is useful for debugging but may differ from field data due to network conditions and device diversity.

What is a good CLS score and why does layout shift matter?

A CLS of 0.1 or below is "Good." Layout shifts frustrate users by causing them to click the wrong element when content jumps. Common causes include images without dimensions, dynamically injected banners, and web fonts that swap after load.

Core Web Vitals Helper

Look up LCP, INP, and CLS thresholds instantly and get actionable optimization tips for each Core Web Vitals metric.

Check Your Score

Your measured value

Thresholds

Select a metric, enter your value, and click Check Score.

LCP Good

≤ 2.5 s

Largest Contentful Paint

INP Good

≤ 200 ms

Interaction to Next Paint

CLS Good

≤ 0.10

Cumulative Layout Shift

Summary

Look up LCP, INP, and CLS thresholds instantly and get actionable optimization tips for each Core Web Vitals metric.

How it works

Select a Core Web Vitals metric: LCP, INP, or CLS.
Enter the value you measured (e.g. from PageSpeed Insights or CrUX).
The tool instantly rates your score as Good, Needs Improvement, or Poor.
Read the per-rating optimization tips to understand what to fix first.
Repeat for each metric to get a full picture of your page experience.

Use cases

Quickly sanity-check a PageSpeed Insights score against official thresholds.
Explain Core Web Vitals ratings to clients or stakeholders.
Prioritize which metric needs the most urgent work.
Reference exact numeric cutoffs when writing performance budgets.
Onboard developers who are unfamiliar with CWV terminology.
Validate field data from CrUX against lab data from Lighthouse.

Frequently Asked Questions

Last updated: 2026-09-22 · Reviewed by Nham Vu