Calculator
Carbon Calculator
Enter your average daily digital activity to estimate your monthly and yearly carbon footprint in kg CO₂e. Everything is calculated in your browser.
- · Nothing you enter is sent to a server or stored.
- · Results are educational estimates, not corporate accounting or legal reporting.
How do I use this calculator?
Enter your daily average. If you receive about 30 emails and send 10 a day, enter 40. For streaming, use the average of weekdays and weekends. If you don't know exact values, a rough guess is fine — this is a tool for comparing habits and setting direction, not for precise measurement.
Each input is multiplied by a fixed emission factor to estimate your yearly CO₂e. Emails, streaming, cloud storage, AI prompts, uploads, social media and shopping are calculated independently, and the results show each share.
Once calculated, look at which activity has the largest share and follow its practical guide to find concrete ways to cut it.
How should I read the result?
The kg CO₂e figure covers digital activity only. It is separate from the footprint of travel, food and heating, which is usually several tonnes per year.
The ratio between categories matters more than the absolute value. If streaming is 60% of the total, changing one quality setting makes a visible difference; if email is 5%, other habits are worth improving first.
Assumptions and limits of the factors are explained on the Methodology page. Real emissions vary with your devices, network type and regional electricity mix.
Frequently asked questions
- Why do the numbers differ from other carbon calculators?
- Digital carbon factors vary widely between studies and services because of different measurement boundaries (LCA scope), regional electricity mixes and whether devices are included. The factors here are simplified for education and must not be used as a replacement for corporate accounting or official reports.
- Does it include the emissions from manufacturing devices?
- No. It estimates only the use phase — network and server energy. The embodied carbon of making phones and laptops is not included.
- Where is the data I enter stored?
- All calculations run in your browser and nothing is sent to a server. Inputs are cleared when you refresh or close the page.
- How can I use the result?
- Pick the single largest category and read its practical guide. Then track your progress with the goal tracker.
Read the methodologyBrowse practical guidesOpen the goal tracker
