Estimate the carbon footprint of web pages based on page weight, data transfer, and green hosting indicators.
This tool turns a page's data transfer size into an estimated carbon footprint per visit. You enter the page weight, typically read from your browser's Network panel, along with monthly traffic and whether the host runs on renewable energy, and it returns grams of CO2 per page view plus a scaled monthly or annual figure. What people get wrong most often: it doesn't fetch or crawl your live site itself, since everything runs in the browser, so the result is only as accurate as the transfer-size number you supply, not a live audit of your URL.
You supply the page's total transferred bytes yourself, ideally the 'transferred' total from a DevTools Network panel rather than uncompressed resource size, plus an optional monthly pageview count. Because the tool has no network access, it cannot retrieve this figure for you; every downstream number depends on that input matching what a real visitor's browser actually downloads, including third-party scripts, fonts, and ads.
A checkbox or selector marks whether the host runs on certified renewable energy; enabling it applies a lower emissions factor to the estimate. The resulting grams-per-visit figure is then multiplied by whatever pageview number you entered to produce monthly or annual totals, so traffic assumptions affect the scaled output as much as the page weight does.
No. The tool runs entirely in your browser and makes no outbound requests to fetch your site, so it has no way to measure a live page's transfer size for you. You need to get that number yourself, for example from your browser's Network tab, and enter it directly.
No, treat it as a directional estimate. It's derived from your entered page weight and hosting status run through a general emissions model, not a measurement of actual grid electricity used for a specific visit, so use it to compare scenarios rather than to report a certified emissions figure.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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