Core Web Vitals Calculator
Enter your LCP, INP/FID & CLS values to see if you pass Google's thresholds. Color-coded pass/fail with optimization tips.
Enter Your Metrics
Find your values in Google PageSpeed Insights, Chrome DevTools Lighthouse, or Search Console.
Largest Contentful Paint
Interaction to Next Paint
Cumulative Layout Shift
Results
💡 What Are Core Web Vitals?
Google's UX Metrics
- LCP (Largest Contentful Paint): Loading speed — how fast the main content appears.
- INP (Interaction to Next Paint): Responsiveness — how quickly the page reacts to input.
- CLS (Cumulative Layout Shift): Visual stability — how much the layout shifts during loading.
- All three must pass for a "Good" page experience assessment.
📖 Thresholds
Google's Benchmarks
- LCP: Good ≤2.5s, Needs Improvement ≤4.0s, Poor >4.0s
- INP: Good ≤200ms, Needs Improvement ≤500ms, Poor >500ms
- CLS: Good ≤0.1, Needs Improvement ≤0.25, Poor >0.25
- These are measured at the 75th percentile of page loads.
🎯 Quick Fixes
Common Optimizations
- LCP: Optimize hero image, preload fonts, reduce server response time.
- INP: Minimize JavaScript, break up long tasks, use web workers.
- CLS: Set image dimensions, avoid dynamic content injection, use font-display:swap.
Frequently Asked Questions
Do Core Web Vitals affect SEO rankings?▾
Yes. Core Web Vitals are a confirmed Google ranking factor as part of the "page experience" signal. While content relevance is still more important, passing CWV can give you an edge over competitors with similar content quality.
What replaced FID (First Input Delay)?▾
Google replaced FID with INP (Interaction to Next Paint) in March 2024. INP measures all interactions throughout the page lifecycle, not just the first one, providing a more complete picture of responsiveness.