Website Carbon Calculator - Get Your Sustainability Score

What your score shows

Cogworks' advanced carbon calculator gives you a carbon grade and performance score, showing how efficiently your website is designed, built and delivered. As well as your score, get initial recommendations that help you:

• Reduce carbon emissions
• Improve website performance
• Lower your website's running costs

The truth about website carbon

The technology sector is responsible for about 4% of global greenhouse gas emissions. Carbon awareness and measurement matter so we can collectively drive change. But what actually causes website carbon emissions, and how do you fix it? The answer is website efficiency. Lighter, more efficient websites not only cut carbon emissions but also improve performance and lower infrastructure costs!

Fix the root cause of website carbon

Boost performance and cut costs while you're at it

Your carbon score is a starting point. The Website Efficiency & Sustainability Audit provides a clear view of how your website impacts carbon emissions, performance, and costs. Our consultant-led audit includes:

• Detail on what's driving carbon, performance and costs
• A report that IT leaders and board members will love
• Prioritised recommendations tied to your goals
• Implementation-ready plan designed for growth

Get An Efficiency & Sustainability Audit

How our calculator works

Built on the Green Web Foundation's trusted methodology, the calculator reveals more than emissions. It uncovers the inefficient code that simultaneously increases your carbon footprint, inflates infrastructure costs, and hurts performance.

See methodology

Other calculators

✅ Estimate CO2 based on page size
❌ No performance analysis
❌ No hosting verification
❌ Generic recommendations

Our calculator

✅CO2.js verified carbon data
✅ Website performance analysis
✅ Green Web Foundation hosting check
✅ AI-powered specific fixes for your site

The Digital Sustainability Playbook

Find out how all teams can use a digitally sustainable website to reach their goals. Real project success examples, plus a free cross-team digital sustainability checklist.

Get Free Playbook

FAQs

How does Cogworks Website Carbon Calculator work?

Can sustainable web design and development really save money?

Do audits and calculators help with ESG reporting?

Yes, we give you real numbers that help. Our audits show how much carbon your website creates, how much you've cut it by, and where you've saved energy. It's solid proof that your digital stuff is getting greener — perfect for backing up your green promises with actual data. We don't do complete ESG reporting; we provide detailed data about your website's carbon footprint and performance. Note: Our calculator is in beta, so check with your ESG team about using our data in official reports.

What is digital sustainability?

How do I measure my website's carbon footprint?

Do sustainable websites perform better?

How much can digital sustainability implementations reduce my website's carbon footprint?

Digital sustainability implementations can significantly reduce your website's carbon footprint. Sustainable cloud infrastructure delivers substantial emission cuts, while green hosting powered by renewable energy provides major reductions compared to traditional hosting. When combined with carbon-smart caching, businesses typically see meaningful reductions in server load and carbon emissions, with organisations saving considerable amounts annually while running faster, more reliable websites.

This calculator is in BETA

The Website Carbon Calculator is in BETA. Cogworks continuously improves its accuracy and usefulness, aiming to provide a truly helpful and transparent tool for understanding website sustainability. Even in its development phase, this thorough approach gives you a realistic baseline of your site's performance and environmental and business impact, forming the foundation for informed, actionable insights. 🙌🌱💪 (Learn more about our methodology)