TTFB Checker
Measure Time to First Byte (TTFB) for any URL — see how fast your server responds and identify bottlenecks.
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How to use this calculator
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Enter the full URL you want to test.
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Click "Check Now" to send a request and measure the server response time.
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TTFB is the time from the request being sent to receiving the first byte of the response.
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Under 200ms is excellent; over 600ms needs optimization.
Frequently asked questions
What is TTFB (Time to First Byte)?
TTFB measures the time from when a browser (or our server) sends an HTTP request to when it receives the first byte of the server's response. It includes DNS lookup time, TCP connection, TLS handshake, and the server's processing time before sending the response.
What is a good TTFB?
Google's Core Web Vitals guidelines classify TTFB as: Good (under 800ms), Needs Improvement (800ms–1800ms), Poor (over 1800ms) for lab conditions. However, for a server-to-server measurement (like this tool), under 200ms is excellent, 200–600ms is acceptable, and over 600ms warrants investigation.
What causes high TTFB?
Common causes: slow database queries (most common), unoptimized server-side code, no caching (every request generates a fresh response), geographic distance between user and server, PHP/Python without opcode/bytecode caching, WordPress without a page cache plugin.
How do I improve TTFB?
Add a CDN to serve cached responses from edge locations near users. Enable page caching (Redis, Varnish, or a WordPress caching plugin). Optimize database queries. Enable server-side compression (gzip/brotli). Use a faster server or upgrade your hosting plan. Move to a server region closer to your main audience.
TTFB Checker — Measure server response time instantly
TTFB and Core Web Vitals
TTFB is the foundation of Google's Core Web Vitals. A slow TTFB delays everything that follows: parsing HTML, loading CSS, executing JavaScript, and rendering. Largest Contentful Paint (LCP) — a key ranking signal — is directly impacted by TTFB. Reducing TTFB is often the highest-leverage performance optimization.
TTFB measurement limitations
Our tool measures server-to-server TTFB from our infrastructure. Real-user TTFB includes DNS lookup, TCP connection, and TLS handshake from the user's device and network — typically 50–300ms more. For real-user measurement, use Google Search Console Core Web Vitals report or field data from Chrome UX Report (CrUX).
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Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →