Free Grader

Core Web Vitals
Grade Your Site

Get a detailed A–F grade for LCP, CLS, INP, FCP, TBT and TTFB — with a prioritised fix plan tailored to your scores.

LCP
Largest Contentful Paint
LCP
Good ≤2.5sOK ≤4sPoor >4s
s
CLS
Cumulative Layout Shift
CLS
Good ≤0.1OK ≤0.25Poor >0.25
score
INP
Interaction to Next Paint
INP
Good ≤200msOK ≤500msPoor >500ms
ms
FCP
First Contentful Paint
FCP
Good ≤1.8sOK ≤3sPoor >3s
s
TBT
Total Blocking Time
TBT
Good ≤200msOK ≤600msPoor >600ms
ms
TTFB
Time to First Byte
TTFB
Good ≤800msOK ≤1800msPoor >1800ms
ms
Grading your Core Web Vitals...
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