Core Web Vitals Scoring Thresholds — Complete Reference

Web Vitals Scoring Thresholds

Google defines three scoring buckets for each Web Vital: Good (green), Needs Improvement (yellow), and Poor (red). These thresholds determine your Core Web Vitals status in Google Search Console and PageSpeed Insights.

Core Web Vitals Thresholds

Metric	Good	Needs Improvement	Poor
LCP	≤ 2,500ms	≤ 4,000ms	> 4,000ms
INP	≤ 200ms	≤ 500ms	> 500ms
CLS	≤ 0.1	≤ 0.25	> 0.25

Supplementary Metric Thresholds

Metric	Good	Needs Improvement	Poor
FCP	≤ 1,800ms	≤ 3,000ms	> 3,000ms
TTFB	≤ 800ms	≤ 1,800ms	> 1,800ms
TBT	≤ 200ms	≤ 600ms	> 600ms

The 75th Percentile Rule

Google uses the 75th percentile (p75) of field data to determine a page's status. This means:

• Your page is "Good" if 75% of visits have a good score
• Your page is "Poor" if the 75th percentile falls in the poor range
• The 75th percentile was chosen because it captures typical user experience while being robust to outliers

Example: 100 page visits with LCP values (sorted):
- 25 visits: 1.0s - 1.5s (good)
- 25 visits: 1.5s - 2.0s (good)
- 25 visits: 2.0s - 2.5s (good)   ← 75th percentile = 2.5s ✅
- 25 visits: 2.5s - 6.0s (mixed)

Result: Page passes (p75 = 2.5s = Good)

Passing Core Web Vitals

A page passes Core Web Vitals assessment if it meets the "Good" threshold at the 75th percentile for all three Core Web Vitals (LCP, INP, CLS). Failing even one metric means the page does not pass.

Mobile vs Desktop

Google assesses mobile and desktop separately:

• Mobile thresholds are the same as desktop
• But mobile devices have slower CPUs and networks
• Most sites have worse mobile scores than desktop
• Google uses mobile-first indexing, making mobile scores especially important

Origin vs URL-Level Data

CrUX reports two levels of data:

• URL-level: Data for a specific page URL (used when enough traffic exists)
• Origin-level: Aggregated data for the entire domain (fallback when URL data is insufficient)

A page needs at least 200 visits in 28 days to have URL-level data in CrUX.

Historical Context: FID to INP

Period	Core Web Vitals
June 2021 – March 2024	LCP, FID, CLS
March 2024 – Present	LCP, INP, CLS

FID had a good threshold of 100ms. Many sites passed FID easily because it only measured the first interaction's delay. INP at 200ms is more stringent because it measures the worst interaction's full latency.