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Web Vitals Score Calculator

データ開発者ネットワーキング

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入力

自動処理

Core Web Vitals

LCP (ms)

Good ≤ 2500ms · Needs Improvement ≤ 4000ms · Poor > 4000ms

INP (ms)

Good ≤ 200ms · Needs Improvement ≤ 500ms · Poor > 500ms

CLS

Good ≤ 0.1 · Needs Improvement ≤ 0.25 · Poor > 0.25

Secondary Metrics (optional)

FCP (ms)

Good ≤ 1800ms · Needs Improvement ≤ 3000ms · Poor > 3000ms

TTFB (ms)

Good ≤ 800ms · Needs Improvement ≤ 1800ms · Poor > 1800ms

TBT (ms)

Good ≤ 200ms · Needs Improvement ≤ 600ms · Poor > 600ms

出力

クライアント側

Metric Breakdown

メトリック	価値	Rating	‘Access-Control-Allow-Origin’ヘッダーが存在しません
結果はここに表示されます

Suggestions

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ガイド

Web Vitals Score Calculator

Plug in your LCP, INP, and CLS measurements and instantly see how your page rates against Google’s Core Web Vitals thresholds. The calculator returns a Good / Needs Improvement / Poor verdict per metric, a pass/fail summary for the page, and concrete fix suggestions for anything below target — all client-side, no data leaves your browser.

使用方法

Grab your numbers from PageSpeed Insights, Lighthouse, the Chrome User Experience Report (CrUX), or your real-user monitoring tool.
登場 LCP (ms), INP (ms), and CLS (unitless score) — these are the three Core Web Vitals required for a pass/fail verdict.
Optionally add the secondary metrics — FCP, TTFBと、 TBT — for a fuller performance picture.
Read the overall badge, the per-metric rating pills, and the suggestion list. Anything below Good comes with a short, prioritized fix list.

機能

Exact Google thresholds – LCP (2500/4000ms), INP (200/500ms), CLS (0.1/0.25) applied byte-for-byte.
Per-metric verdict – Color-coded Good / Needs Improvement / Poor rating pill for every metric you enter.
Overall CWV badge – Passes only when LCP, INP, and CLS are all Good — the same logic Google uses.
Secondary metrics – Optional FCP, TTFB, and TBT inputs for fuller performance triage.
Actionable fixes – Each failing metric ships with a short list of the most common root causes and remediations.
Plain-English meanings – Every metric is explained in one sentence so non-specialists can follow along.
プライバシー第一 – Pure client-side calculation; nothing is sent to any server.

 よくある質問

What are Core Web Vitals and why do they matter?

Core Web Vitals are a set of real-user metrics Google uses to measure page experience: how quickly the main content loads (LCP), how responsive interactions feel (INP), and how visually stable the page is (CLS). They're a public, standardized way to quantify perceived performance — and a Page Experience signal in Google Search ranking.
What's the difference between LCP, INP, and CLS?

LCP (Largest Contentful Paint) measures load — how long until the biggest visible element appears. INP (Interaction to Next Paint) measures responsiveness — the worst-case delay between input and screen update. CLS (Cumulative Layout Shift) measures visual stability — how much content jumps around. Together they cover loading, interactivity, and stability.
Why did INP replace FID as a Core Web Vital in March 2024?

FID only measured the delay before the first interaction handler ran. Real users complained about laggy scroll, slow buttons, and long-running handlers that FID couldn't see. INP captures the full path from input to next paint, across all interactions on the page — a far better proxy for how snappy a page actually feels.
What's the difference between lab data and field data?

Lab data (Lighthouse, WebPageTest) is measured in a controlled environment with a fixed device and network profile — repeatable, useful for debugging. Field data (Chrome User Experience Report, real-user monitoring) is collected from actual visitors and reflects the diversity of devices, networks, and behaviors. Google's pass/fail verdict for ranking is based on field data — specifically the 75th-percentile value across all real visits.
Does passing Core Web Vitals guarantee better search ranking?

No — Core Web Vitals are one signal among many. Relevance, content quality, and links still dominate. CWV is a tiebreaker between pages of similar quality and can prevent a 'poor experience' demotion. Treat passing CWV as table stakes rather than a growth lever.