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Performance tool
Website carbon estimator
Turn page weight and traffic into an indicative monthly data and emissions estimate. Compare the current page with a lighter target.
Private by design. Your entries stay in this browser and are not sent to WebHostGB.
How the result is worked out
A useful guide, with the assumptions visible
The estimate applies an openly stated grams-per-gigabyte assumption to transferred data and shows the result as a range because infrastructure varies.
Common questions
About this website carbon estimator
Can a website be carbon neutral?
That claim needs a defined boundary, measurement method and credible reduction plan. A lightweight website is useful, but it is not the whole footprint.
What is the easiest way to reduce page weight?
Optimising oversized images is often the fastest win. Fonts, video, trackers and unused scripts are also common sources of avoidable transfer.
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