Core Web Vitals Score Calculator

Evaluate your LCP, INP, and CLS performance metrics against official Google thresholds to calculate ratings and composite scores.

Metric Inputs

Largest Contentful Paint (LCP) - Seconds

≤ 2.5s (Good) Good

Interaction to Next Paint (INP) - Milliseconds

≤ 200ms (Good) Good

Cumulative Layout Shift (CLS) - Score

≤ 0.1 (Good) Good

Overall Web Vitals Assessment

Composite Assessment Status

PASS

All Core Web Vitals thresholds met successfully!

Official Google Thresholds Reference

1. LCP Thresholds

Good: ≤ 2.5s
Needs Improvement: ≤ 4.0s
Poor: > 4.0s

2. INP Thresholds

Good: ≤ 200ms
Needs Improvement: ≤ 500ms
Poor: > 500ms

3. CLS Thresholds

Good: ≤ 0.1
Needs Improvement: ≤ 0.25
Poor: > 0.25

What is Core Web Vitals Score Calculator?

Core Web Vitals Score Calculator is a browser-based utility for web performance and delivery analysis. It helps you transform, inspect, generate, or evaluate the relevant input without installing a separate desktop tool.

How to use this tool

Enter or paste the required input, select the available options, then review the generated result before copying or applying it in your project. Check the output in its real target environment when accuracy matters.

Frequently Asked Questions (FAQ)

Yes. This tool is designed to process the values you enter in your browser.

Review the output for the target syntax and test it in the application, browser, API, or workflow where it will be used.