Website Carbon Calculator | Check Website CO₂ Footprint

Check how eco-friendly any website is. Measure CO₂ emissions per page view, page weight, green hosting status, and carbon rating (A+ to F) using the Website Carbon API. Designed specifically for developers and professionals, this free online analyzer runs entirely in your browser to process tasks quickly and securely. Enjoy unlimited usage with no data tracking and no registration required.

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Carbon Rating Guide

A+

< 0.095g CO₂ per visit

Exceptional - among the cleanest 10% of websites. Minimal data transfer and likely green-hosted.

0.095 – 0.186g CO₂ per visit

Excellent - well-optimised with low page weight. A strong result for most sites.

0.186 – 0.341g CO₂ per visit

Good - below the global average. Some room for improvement through compression or a CDN.

0.341 – 0.493g CO₂ per visit

Average - around the global median for web pages (~2 MB). Image and script optimisation would help.

0.493 – 0.656g CO₂ per visit

Below average - heavy page weight or unoptimised assets. Lazy-loading and minification recommended.

0.656 – 0.846g CO₂ per visit

Poor - significantly above average emissions. Large uncompressed resources are likely the cause.

> 0.846g CO₂ per visit

Very poor - among the heaviest 10% of websites. A full performance and sustainability audit is needed.

Ratings use the Sustainable Web Design v4 model - 0.81 kWh/GB data transfer energy, 442 g CO₂/kWh grid intensity, 50 g CO₂/kWh renewable intensity. Green-hosted sites use the lower renewable figure.

About Website Carbon Calculator

Check how environmentally friendly any website is. Our free tool uses the Website Carbon API to measure CO₂ emissions per page view, page weight, and whether a site uses green hosting.

Key Features

Letter-grade carbon rating (A+ to F) for any website
CO₂ emissions per page view for both grid and renewable energy sources
Green hosting detection - see if the site runs on renewable infrastructure
Page transfer size and energy consumption per 1,000 page views
Percentile ranking showing how the site compares to others tested
One-click copy of all results to clipboard

Use Cases

Audit the environmental impact of your own website before launch
Compare competitor sites' carbon footprints during a design review
Verify that a hosting provider's green claims hold up in practice

Related Keywords

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Powered by Website Carbon API

Carbon data is fetched from the Website Carbon API (websitecarbon.com). The URL you enter is sent to their API to retrieve emissions data. No other personal information is collected.

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Frequently asked questions

What is Website Carbon Calculator used for?

Check how eco-friendly any website is. Measure CO₂ emissions per page view, page weight, green hosting status, and carbon rating (A+ to F) using the Website Carbon API.

Is Website Carbon Calculator free to use?

Yes. Website Carbon Calculator is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use Website Carbon Calculator?

No. Website Carbon Calculator works immediately in your browser with no signup, login, or email address required.

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