# Digital Carbon Footprint Calculator: How Much CO₂ Your Website Generates
Discover the real environmental impact of any web page. Analyze its weight, estimate the grams of CO₂ per visit, and learn how to reduce the digital pollution of your projects.# What is a website's digital carbon footprint?
Every time you open a web page, your device, home router, undersea cables, and servers on the other side of the world consume electricity. That electricity is still largely generated by burning fossil fuels. The result: a real amount of CO₂ emitted into the atmosphere for every visit.A website's digital carbon footprint is measured in grams of CO₂ equivalent (gCO₂e) per visit. An average website generates approximately 0.5g of CO₂ per load. Although it seems insignificant, a site with 100,000 monthly visits can emit more than 600kg of CO₂ per year, the equivalent of driving a gasoline car more than 3,000 km.# How is a website's CO₂ calculated?
The calculation model used is based on the Sustainable Web Design Model standards, which divides energy consumption into four main segments:Data Transfer
The total weight of the page determines how many gigabytes are transferred. The standard considers
0.81 kWh/GB for network infrastructure. User Device
The computer or mobile receiving the page consumes energy. It is estimated at
0.52 kWh/GB of processed data. Carbon Intensity
The global reference value of
442 gCO₂/kWh is used to convert energy consumption into real carbon emissions. Caching Factor
The model applies a factor of
0.75 assuming that 25% of users already have resources cached. # What does the efficiency rating mean?
- A+ and A: Less than 0.2g of CO₂. Very light and optimized sites.
- B: Between 0.2 and 0.5g. Below the global average.
- C: Between 0.5 and 1g. The average for the current web.
- D and E: Between 1 and 4g. Heavy pages with relevant impact.
- F: More than 4g per visit. Very high impact.
# How to reduce your website's carbon footprint
Image Optimization
Use formats like WebP or AVIF to reduce size by up to 80% without noticeable quality loss.
Server Compression
Enabling Brotli or GZIP reduces the size of text files by up to 70%.
Sustainable Hosting
Choosing a provider with certified renewable energy can reduce impact by nearly 100%.
Cache and CDN
Configure long cache headers to avoid unnecessary re-downloads.