Calculator · runs in your browser
How fast is your site
on a phone?
Most visitors from ads open your site on a phone. Enter the address and Google measures how fast the main screen loads, how quickly the page reacts and whether it jumps around. We translate the result into plain words.
- Free, no sign-up
- Formulas are open on the page
- Our prices are the “from” prices of the service pages
- Score 0-100Google's overall speed rating for mobile. 90 and above is good.
- Main screen (LCP)How long until the biggest element on the screen appears. Good: up to 2.5 s.
- Reaction (INP / TBT)How quickly the page responds to a tap. Long delays feel like a broken site.
- Stability (CLS)Whether the layout jumps while it loads, so people tap the wrong button.
Google is opening your site on a test phone…
It usually takes 15 to 40 seconds.
-/100
Mobile score
What slows the page down most
What we achieved on a store we built
- 93-100 Lighthouse mobile speed scores on an online store we built
- 1.7 s for the main content of product pages to load, down from 4.2 s
Data: Google PageSpeed Insights, a lab test on a mid-range phone. Real visitors' results may differ.
How we calculate
Score
90-100 good · 50-89 needs work · 0-49 poor
This is Google's own scale for the Lighthouse performance score on a test phone.
Main screen, LCP
≤ 2.5 s good · ≤ 4 s needs work · > 4 s poor
Google's thresholds for Largest Contentful Paint.
Reaction and stability
TBT ≤ 200 ms · INP ≤ 200 ms · CLS ≤ 0.1
TBT is the lab stand-in for INP. INP from real Chrome users is shown when Google has enough data for your site.
Let's check it on your data
A free 30-minute call: we look at your numbers and tell you where the calculation and reality part ways.
Discuss this with the teamHonest about the math
One lab run is a snapshot. Results change between runs, by time of day and by the visitor's phone and network. Run the test 2-3 times and look at the trend, not one number.
This is a reference point, not a promise of results. Our prices here are “from” prices, the exact amount is fixed in writing after an audit.
Questions
Why is my score lower than on my own phone?
Google tests on a mid-range phone with a slower network on purpose. That is closer to how a typical visitor from ads sees your site.
The check says the quota is exceeded. What now?
Google limits free checks. Open the same test on pagespeed.web.dev with the link, or try again in a few minutes.
What makes a site slow most often?
Heavy images, too many scripts and plugins, slow hosting and fonts loaded the wrong way. The list under your result shows what Google found on your page.
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