Carbon Rating of Websites

By:: SustainableWebDesign.org
Source:: https://sustainablewebdesign.org/digital-carbon-ratings/

Digital Carbon Rating Scale

RatingHTTP Archive Transfer Size (kb)*Grams CO2 Per Pageview
A+272.51 (5%)0.095
A531.15 (10%)0.186
B975.85 (20%)0.341
C1410.39 (30%)0.493
D1875.01 (40%)0.656
E2419.56 (50%)0.846
F≥ 2419.57≥ 0.847

* Percentile data for transfer size has been pulled from the June 1, 2023 crawl of the HTTP Archive. See this sheet for more information.