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Website Carbon

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Estimate the carbon emissions of web pages with Website Carbon, the keyless API from Wholegrain Digital that powers websitecarbon.com. Give a page's weight in bytes and whether it is on green hosting, and get the CO2e a single visit costs, the page's Digital Carbon Rating from A+ to F, and how it compares with the pages measured across the web. Project that against real traffic for a monthly and yearly footprint, weigh up a move to renewable hosting, rank a set of pages to find what is worth optimising, price a download or a month of CDN traffic, and fail a build when a page goes over its carbon budget. No account or API key is required.

6 actions

Actions

Steps your workflow can run in Website Carbon.

Estimate page emissionsEstimate the carbon emissions of a single page load from the page's weight in bytes and whether it is on green hosting. Returns the grams of CO2e a visit costs, the page's Digital Carbon Rating from A+ to F, the percentage of measured pages it is cleaner than, and the energy and emissions behind those figures.
Estimate annual emissionsProject a page's emissions across real traffic: give the page weight and how many times it is viewed in a month, and get the monthly and yearly totals in grams, kilograms and tonnes of CO2e, plus the volume of CO2 that represents and what green hosting would have saved over the year. A per-visit figure is too small to act on; this is the number a sustainability report or a reduction target is written against.
Compare hosting optionsPrice the same page on green hosting and on ordinary grid-powered hosting, and get both sides in full (emissions, rating and percentile for each), plus what switching would save per visit and, if you give the traffic, per year. This is the case for moving a site to a renewable host, in the numbers a decision is made on.
Compare pagesEstimate several pages at once and rank them by emissions, heaviest first, with each page's share of the total. Use it to find which templates on a site are worth optimising, or to compare a page against a competitor's.
Check carbon budgetTest a page against a carbon budget, a minimum Digital Carbon Rating, or both, and get a plain pass or fail to branch on: for a build step, a release check, or a scheduled audit that should raise an alert when a page gets heavier. When a gram budget is set, the result also says what page weight would meet it and how many bytes the page is over.
Estimate data transfer emissionsEstimate the emissions of moving data that is not a page: a file people download, a video stream, an email attachment, or a month of CDN traffic. Give the size in megabytes and how many times it is transferred; the page model's allowance for returning visitors having bytes cached is taken back out, because a download gets no such discount.

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