We’ve added a new grading system to Website Carbon – read about it here

The original Website Carbon calculator

Yes, websites have a carbon footprint

The internet consumes a lot of electricity. 1021 TWh per year to be precise. To give you some perspective, that’s more than the entire United Kingdom.

From data centres to transmission networks to the billions of connected devices that we hold in our hands, it is all consuming electricity, and in turn producing carbon emissions equal to or greater than the global aviation industry. Yikes!

We developed the first methodology for estimating the carbon emissions attributed to a website. This free tool is here to help raise awareness and inspire a more sustainable internet.

If you want help doing a more detailed analysis or need assistance reducing emissions from your web project, our team would be happy to discuss your requirements.

Beautiful, low carbon websites tested by the website carbon calculator

Here are some of the most efficient sites as tested by the website carbon calculator. These websites make great use of compressed images, efficient file formats and lightweight fonts, avoiding bloated frameworks. If you want to know more, check out our resources on designing sustainable websites.

Do Nation

0.29g CO2/page view

C40 Cities

0.34g CO2/page view

Riverford Organic

0.23g CO2/page view

Low Tech Magazine

0.40g CO2/page view


0.25g CO2/page view


0.23g CO2/page view

Digital Sustainability Consulting

Work with Wholegrain Digital, world leaders in Digital Sustainability and pioneers in the field to achieve your net zero goals and help contribute to greening the web.

A few lovely companies we've worked with

Want to work with us? Let's make it happen!

Our services

This website carbon calculator has been created by Wholegrain Digital to help inspire and educate people to create a zero carbon internet. It is hosted using renewable energy.


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