How is website carbon calculated?

We measure the page weight in bytes, convert to GB, multiply by energy intensity (0.194 kWh/GB), then by grid carbon intensity (494 gCO2/kWh). Green hosting reduces emissions by 24.3%.

What is the carbon badge?

An embeddable SVG badge you can add to your website to publicly display your carbon score. Pro and Business plans include the embeddable badge.

Yes — the basic scanner is completely free with no signup required. Free users get 1 page scan per request. Pro plans unlock 50-page scans and the embeddable badge.

Based on SWDM v4 methodology

How much CO₂ does your website emit?

Q: What is Carbon Badge?

Carbon Badge is a free tool that measures the CO2 emissions of any website using the Sustainable Web Design Model (SWDM) v4, giving a grade from A (cleanest) to F.

Q: What is Ecoping and how does Carbon Badge compare?

Ecoping was a website carbon emissions monitoring tool that has stopped accepting new users. Carbon Badge is a free, actively maintained Ecoping alternative: instant scan with no signup, SWDM v4 methodology, embeddable SVG badge, and a clear A–F grading system.

Q: How does Carbon Badge compare to Ecoping?

Both Carbon Badge and Ecoping measure website carbon emissions. Carbon Badge uses the SWDM v4 methodology with real-time scanning and provides an embeddable badge. Unlike Ecoping, Carbon Badge offers a free instant scan with no account required and is actively maintained with new signups open.

Instant carbon footprint scan. Grade A–F. Green hosting check. Embeddable badge. Free, no signup required.

How it works

Three steps from URL to badge in under 10 seconds

Enter your URL

Paste any public website URL. We fetch the page and measure its transfer size in bytes.

Get your CO₂ grade

We calculate grams of CO₂ per pageview using SWDM v4 and assign a grade from A (excellent) to F.

Embed your badge

Pro users get an embeddable SVG badge that updates automatically with every new scan.

Everything you need

A full toolkit for measuring and reducing your digital carbon footprint

SWDM v4 methodology

Uses the industry-standard Sustainable Web Design Model: 0.194 kWh/GB × 494 gCO₂/kWh.

Grade A–F

Instant letter grade so visitors understand your carbon score at a glance.

Embeddable badge

A live SVG badge you can paste into your site footer. Automatically reflects your latest scan.

Automatic monitoring

We re-scan your domain weekly or daily and alert you when your score changes.

Green hosting check

We query the Green Web Foundation database to verify whether your host uses renewable energy.

API access

Business and Enterprise plans include a full REST API for integration into CI/CD pipelines.

Understanding the grades

Scores are in grams of CO₂ per pageview, based on a single page load

Excellent < 0.15g CO₂ per pageview

Good 0.15 – 0.30g CO₂ per pageview

Average 0.30 – 0.50g CO₂ per pageview

Poor 0.50 – 0.75g CO₂ per pageview

Bad 0.75 – 1.00g CO₂ per pageview

Very Bad > 1.00g CO₂ per pageview

0.5g

Average web page CO₂ (HTTPArchive 2023)

494

gCO₂/kWh world grid intensity (Ember 2023)

SWDM v4

Methodology used by Website Carbon Calculator

Start reducing your web carbon footprint

Free scan takes 10 seconds. No signup, no credit card.

Scan your site View pricing

Carbon Badge vs Ecoping: Website Carbon Footprint Tools

Carbon Badge is a free website carbon footprint scanner that uses the Sustainable Web Design Model (SWDM) v4 to measure CO2 emissions per pageview — and a free, actively maintained Ecoping alternative.

Ecoping has stopped accepting new users. Carbon Badge picks up where Ecoping left off: instant results with no signup, A–F grading, green hosting detection, and an embeddable SVG badge to display your carbon score publicly.

Free instant scan — no account needed, open to everyone
SWDM v4 methodology — same as Website Carbon Calculator
Green hosting detection — checks the Green Web Foundation database
Embeddable badge — display your score on your website footer
A–F grading system — clear, actionable results at a glance
API access — integrate carbon checks into your CI/CD pipeline

Frequently asked questions

What is Carbon Badge?

Carbon Badge measures the CO2 emissions of any web page using the Sustainable Web Design Model (SWDM) v4 — the same methodology used by Website Carbon Calculator. Enter any URL and instantly get a grade from A to F with actionable recommendations.

How is website carbon footprint calculated?

We measure the transfer size of a page in bytes, convert to gigabytes, then apply: CO2 = GB × 0.194 kWh/GB × 494 gCO2/kWh. If the site uses green hosting, we apply a 24.3% reduction factor. The 0.194 kWh/GB covers data centres, networks, and end-user devices.

What does "green hosting" mean?

Green hosting providers power their servers with renewable energy. We check each domain against the Green Web Foundation database of verified green hosts. Green-hosted sites get a better CO2 score because their grid is cleaner.

Is the scanner really free?

Yes — the basic single-page scan is free with no account needed. Pro plans (from €9/mo) unlock multi-page scans, the embeddable badge, and automatic monitoring.

Can I display a badge on my website?

Yes. Pro and Business plan subscribers get an embeddable SVG badge that updates automatically. Just paste one line of HTML into your site footer.

What is Ecoping?

Ecoping was a website carbon footprint monitoring tool that calculated an EcoScore out of 100 using the Sustainable Web Design method. Ecoping has since stopped accepting new users. Carbon Badge is a free, actively maintained Ecoping alternative — with instant scans, no signup required, and an open embeddable badge system.

How does Carbon Badge compare to Ecoping?

Both tools measure website carbon emissions, but Carbon Badge uses the SWDM v4 methodology and offers instant, free scans with no account needed. Carbon Badge also provides an embeddable SVG badge and an A-to-F grading system. Unlike Ecoping — which has shut down new registrations — Carbon Badge is actively maintained and free for everyone to use.

Free Environmental Calculators

Measure your full environmental impact beyond websites.

🌍