Website Carbon Footprint
Pricing
from $10.00 / 1,000 results
Website Carbon Footprint
Calculate CO2 emissions of any web page. Get carbon grades (A+ to F), green hosting verification, page weight analysis, and sustainability recommendations using SWDM v4. No API key needed.
Pricing
from $10.00 / 1,000 results
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0.0
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J N
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1
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17 days ago
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Website Carbon Footprint Calculator
Estimate the CO2 emissions of any web page based on the Sustainable Web Design Model v4 (SWDM). Get carbon grades (A+ to F), green hosting verification, and actionable sustainability recommendations.
No API key needed — just enter a URL.
What it does
- CO2 emissions per page view — calculates grams of CO2 equivalent (gCO2e) using SWDM v4
- Carbon grade — A+ (cleanest) to F (dirtiest), based on the global median of 0.36g CO2/view
- Percentile ranking — "Cleaner than X% of websites"
- Green hosting check — verifies if the site uses renewable energy via the Green Web Foundation
- Page weight analysis — measures HTML, images, scripts, stylesheets, and fonts
- Annual CO2 estimate — projected emissions for 120,000 annual page views
- Sustainability recommendations — specific actions to reduce carbon footprint
Pricing
| Cost type | Price |
|---|---|
| Per result | $0.01 ($10.00 / 1,000 URLs) |
| Per Actor start | $0.00005 (one-time) |
| Platform usage | Free (included) |
Use cases
- Sustainability reports — measure and track your website's environmental impact for ESG/CSRD compliance
- Agency audits — bulk-scan client websites to identify sustainability improvements
- Green web certification — verify green hosting status across your domain portfolio
- DevOps monitoring — track page weight and carbon footprint after each deployment
- Competitive analysis — compare your site's carbon efficiency against competitors
- Procurement — evaluate vendor websites for sustainability criteria
- Education — teach web developers about the environmental cost of page bloat
Input
| Field | Type | Description |
|---|---|---|
urls | String list | One or more website URLs to analyze |
timeout | Integer | Request timeout in seconds (default: 30) |
Output fields
| Field | Type | Description |
|---|---|---|
url | String | Analyzed page URL |
co2PerView | Number | Grams CO2e per average page view |
co2PerNewView | Number | Grams CO2e for a new visitor |
co2PerReturnView | Number | Grams CO2e for a returning visitor (cached) |
co2Annual | Number | Estimated annual CO2e (grams) for 120K views |
grade | String | Carbon grade: A+, A, B, C, D, E, F |
rating | String | Human-readable rating |
cleanerThan | Integer | Percentile — cleaner than X% of websites |
greenHosting | Boolean | Verified green hosting via Green Web Foundation |
hostedBy | String | Green hosting provider name |
transferSizeKB | Number | Estimated page transfer size (KB) |
resourceCount | Integer | Number of page resources |
imageCount | Integer | Number of images |
scriptCount | Integer | External scripts |
stylesheetCount | Integer | CSS stylesheets |
fontCount | Integer | Preloaded fonts |
recommendations | Array | Actionable sustainability recommendations |
methodology | String | Calculation methodology used |
Carbon grades
| Grade | CO2/view | Rating |
|---|---|---|
| A+ | ≤ 0.10g | Excellent |
| A | ≤ 0.20g | Great |
| B | ≤ 0.36g | Better than average |
| C | ≤ 0.50g | Average |
| D | ≤ 1.00g | Below average |
| F | > 1.00g | Poor |
The global median is approximately 0.36g CO2 per page view (grade B boundary).
Methodology
This actor uses the Sustainable Web Design Model version 4 (SWDM v4) published by the Green Web Foundation. The model calculates emissions across three system segments:
- Data centers — energy to serve content (operational + embodied)
- Networks — energy to transmit data (operational + embodied)
- User devices — energy to render pages (operational + embodied)
Green hosting verification uses the Green Web Foundation API, which maintains a database of hosting providers verified to use renewable energy.
FAQ
Q: How accurate is this? A: The SWDM v4 model provides estimates, not exact measurements. Page weight is estimated from HTML analysis — actual transfer sizes depend on browser behavior, caching, and compression. Use this for relative comparisons and trend tracking.
Q: What counts as "green hosting"? A: The Green Web Foundation verifies hosting providers that use 100% renewable energy or purchase equivalent renewable energy certificates. The database includes major providers like Google Cloud, AWS (some regions), and hundreds of specialized green hosts.
Q: Why does my page show a different result than websitecarbon.com? A: Both use SWDM, but page weight measurement differs. Our actor estimates from HTML analysis, while websitecarbon.com uses browser-based measurement that captures all resources. Results should be in the same ballpark.
Q: What are the 120,000 annual views based on?
A: We estimate 10,000 monthly page views as a baseline for annual calculations. Adjust by multiplying co2PerView by your actual annual traffic.
Q: Does this work for single-page apps (SPAs)? A: This actor analyzes the initial HTML response. SPAs that load most content via JavaScript after page load may show lower transfer sizes than actual usage. For SPAs, the initial page load estimate is still meaningful.
Q: Is there a limit on how many URLs I can check? A: Yes, up to 100 URLs per run.
Q: Do I need an API key? A: No. This actor requires no API keys or authentication.
Q: What regulations require carbon reporting for websites? A: The EU Corporate Sustainability Reporting Directive (CSRD) requires large companies to report environmental impact, which can include digital services. The EU Energy Efficiency Directive also covers data center operators. Several countries are developing digital sustainability standards.
