Web Vitals Score Estimator
Estimate Core Web Vitals scores from manual inputs: LCP, FID, CLS. Grade each as Good, Needs Improvement, or Poor
LCP (Largest Contentful Paint)
Time for largest content element to render
seconds
Good: ≤2.5s | NI: ≤4.0s | Poor: >4.0s
FID (First Input Delay)
Time from first interaction to browser response
ms
Good: ≤100ms | NI: ≤300ms | Poor: >300ms
CLS (Cumulative Layout Shift)
Total unexpected layout shifts score
score
Good: ≤0.1 | NI: ≤0.25 | Poor: >0.25
INP (Interaction to Next Paint)
Responsiveness of all interactions
ms
Good: ≤200ms | NI: ≤500ms | Poor: >500ms
TTFB (Time to First Byte)
Server response time
ms
Good: ≤800ms | NI: ≤1800ms | Poor: >1800ms
More Developer Tools tools at toool.cc