$1 per result

Website Carbon Calculator - CO2 per Page Load

Estimate CO2 emissions per page load and get a carbon grade for any website. Useful for sustainability reporting and green web claims.

Run it on Apify All tools

Who it is for

Sustainability reporting, green-hosting claims, and performance work that needs a number attached.

What you would use it for

Estimate CO₂ per page load and get a carbon grade for any URL.
Support a sustainability claim with a figure and a stated method.
Compare page weight across a site to find the worst offenders.
Show the emissions effect of a performance improvement.

What you get back

One JSON record per page checked. These are the actual fields returned by the most recent successful run — read from the live catalogue, not a documented ideal.

Field	Sample shape
`actor`	string — artifact-machine-carbon-calculator
`actorVersion`	string — 0.1.0
`estimatedAt`	string — 2026-07-29T05:04:17.027Z
`url`	string — https://neighbornest.kids/
`co2PerLoad`	number — 0.017
`co2PerYear`	number — 0
`energyPerLoad`	number — 0.000037586549296975136
`greenHost`	boolean — false
`pageSize`	number — 49825
`pageWeight`	object (4 keys)
`rating`	string — A+
`ratingLabel`	string — Excellent
`score`	number — 100
`method`	string — local-fallback
`issues`	array (0)

Sample output

Trimmed from a real run.

{
  "actor": "artifact-machine-carbon-calculator",
  "actorVersion": "0.1.0",
  "estimatedAt": "2026-07-29T05:04:17.027Z",
  "url": "https://neighbornest.kids/",
  "co2PerLoad": 0.017,
  "co2PerYear": 0,
  "energyPerLoad": 0.000037586549296975136,
  "greenHost": false,
  "pageSize": 49825,
  "pageWeight": {
    "bytes": 49825,
    "kb": 49,
    "mb": 0.05,
    "isCompressed": true
  },
  "rating": "A+",
  "ratingLabel": "Excellent",
  "score": 100,
  "method": "local-fallback",
  "issues": []
}

Pricing

$1 per result. Pay-per-event through Apify — no subscription, and a run that returns nothing costs nothing.

Calling it from code

Any HTTP client works. Replace <TOKEN> with your Apify API token.

curl -X POST "https://api.apify.com/v2/acts/artifact-machine~artifact-machine-carbon-calculator/run-sync-get-dataset-items?token=<TOKEN>" \
  -H "Content-Type: application/json" \
  -d '{"startUrls":[{"url":"https://example.com"}]}'

Questions

How accurate is the estimate?

It is a model, not a measurement. It derives energy from transfer size and applies a grid carbon intensity, so it is useful for comparison between pages and for tracking change over time. Treat it as an estimate with a stated method rather than an audited figure.

What traffic does the yearly figure assume?

Ten thousand pageviews per month, or 120,000 per year. The assumption is fixed so that figures are comparable between pages and between runs.

Other tools

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Details read from the live Apify catalogue on 2026-07-29.