Core Web Vitals Evaluator
Enter measured LCP, INP and CLS to evaluate Google thresholds. A transparent local evaluator, not a live website scan or ranking prediction.
Enter measurements you already have. For a field assessment, use the relevant device’s 75th-percentile values. This page does not request or scan your store.
Interpret your measurements
2.5s · Within the good threshold. Keep monitoring real traffic.
200ms · Within the good threshold. Keep monitoring real traffic.
0.1 · Within the good threshold. Keep monitoring real traffic.
Read the thresholds, not just a score.
| Metric | Good | Needs improvement | Poor |
|---|---|---|---|
| LCP | ≤ 2.5 s | > 2.5 to 4 s | > 4 s |
| INP | ≤ 200 ms | > 200 to 500 ms | > 500 ms |
| CLS | ≤ 0.1 | > 0.1 to 0.25 | > 0.25 |
Field metrics describe actual visits. A lab run uses a controlled device/network simulation and may not represent your visitors. Standard Lighthouse navigation reports do not establish field INP; Total Blocking Time is a different metric. Evaluate the relevant device’s 75th-percentile field values when available.
Three good entered numbers do not certify a store, establish sample size or promise ranking. Missing field data means there is no demonstrated field assessment—not zero latency. This tool never fetches a URL and cannot verify where the numbers came from.
Source review: 2026-09-13. Google’s Core Web Vitals guidance and web.dev metric thresholds.
Measurement questions
Does this scan my website?
No. It interprets measurements you enter. Use a trusted lab tool or your own field reports to obtain those measurements.
Can a lab score prove that Core Web Vitals pass?
No. Lab tests help diagnose issues; real-user field data is required to make a field performance claim.
Connect the number to the storefront.
Work through the Shopify speed guide, understand bundle responsibilities, or inspect Ecomfella’s real theme. Tools do not enable checkout or change your store.