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Core Web Vitals & PageSpeed Calculator

Test your mobile + desktop PageSpeed Insights scores, and see what a slow LCP is costing you in conversions. Most page-speed tools stop at the score. This one turns your mobile load time into the share of conversions it is likely costing you, and into dollars if you enter your revenue.

Runs Google PageSpeed Insights on mobile + desktop in parallel. Each scan takes 10–30s. Field data (real-user metrics) shows when Google has enough Chrome User Experience data for the URL.

Optional. Enter your own figure to see the loss in dollars a year. Without it, the calculator shows the percent of conversions only.

Why this matters for AI search

Speed matters for AI search too, just less directly than the revenue math. Assistants that fetch pages live during a conversation work within timeouts, and content that only appears after heavy JavaScript runs may never be read. Google says its AI features follow the same SEO best practices as regular Search, where page experience is one signal among many. A fast, server-rendered page is part of the foundation AI search needs. It will not earn citations on its own.
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FAQ

Frequently asked questions

PageSpeed Insights scores run 0–100. 90+ is good (green), 50–89 needs improvement, and below 50 is poor. Mobile scores are typically lower than desktop and matter more, since Google uses mobile-first indexing and most traffic is mobile. The calculator above tests both.

Core Web Vitals are Google's three user-experience metrics. LCP (Largest Contentful Paint) measures loading. Aim for under 2.5s. INP (Interaction to Next Paint) measures responsiveness. Aim for under 200ms. CLS (Cumulative Layout Shift) measures visual stability. Aim for under 0.1.

Yes. Core Web Vitals are a confirmed Google ranking signal, and a slow, heavy page is also harder for AI crawlers to fetch and parse cleanly. Speed alone won't get you cited, but a fast, server-rendered page removes a common reason search engines and AI assistants skip your content.

Published data from Amazon and Google links slower load times to lower conversion rates. The calculator applies Amazon's figure of roughly 1% of conversions per 100ms to the time your mobile page takes past Google's 2.5-second threshold, capped at half. Enter your monthly online revenue to see that in dollars a year. The estimate is only as good as your own numbers, so treat it as a starting point for the conversation, not a forecast.

Common wins: serve properly sized, modern-format images, reduce render-blocking JavaScript, and use server-side rendering instead of client-side. If your site runs on a heavy page builder or unoptimized WordPress theme, a modern rebuild is one option, or start with the free AI visibility score for an initial check of performance alongside your other AI-visibility signals.

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