Free tools · Digital
How much CO2 does your website emit?
Enter your page weight and monthly views. We use the Sustainable Web Design model v4. Pick the Qatar grid or the world average.
Your site's footprint
Enter your numbers and press Calculate.
Quick wins: compress images (WebP or AVIF), lazy-load media, cut unused scripts and fonts, cache static files.
Method and sources
Data per view in GB times kWh per GB for each segment. Running energy: data centre 0.055, network 0.059, user device 0.08 kWh/GB, times your chosen grid. Embodied energy: data centre 0.012, network 0.013, user device 0.081 kWh/GB, times the world average 0.494, as the model advises. Green hosting removes data centre running emissions only. Per year is per view times views times 12. We use 1 GB = 1,000 MB.
Questions
How do I find my page size?
Open the page in Chrome, press F12, open the Network tab and reload. The bottom bar shows "transferred". Enter that number in MB.
Why not just type a URL?
A browser page cannot load another site and measure it for privacy and security reasons. So we ask for the page weight instead.
What model is this?
The Sustainable Web Design model, version 4. It turns data transferred into energy for data centres, networks and user devices, then into CO2e.
Does green hosting make my site zero carbon?
No. It only removes the data centre running energy. Networks, user devices and the embodied energy of hardware still count.
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