Inspiration
Many people want to reduce their carbon footprint but struggle to estimate the impact of their daily activities. We built this interactive tool to enable anyone to calculate their emissions and discover ideas to reduce them.
What it does
This website allows users to enter everyday values such as monthly electricity usage, weekly car mileage, annual flights and diet type. It then estimates the annual carbon emissions for each activity and provides a breakdown along with targeted tips for improvement.
How we built it
We used HTML, CSS and vanilla JavaScript to build a simple, responsive interface. All calculations run entirely in the browser without any servers or external APIs. We defined conversion factors such as 0.233 kg CO₂ per kWh of electricity, 0.404 kg per mile of driving, 250 kg per flight, and typical annual emissions for different diets. The calculator multiplies inputs by these factors, sums them and displays the totals.
Challenges
Our main challenge was balancing simplicity with accuracy. We wanted the tool to be easy to use and work offline while still providing meaningful guidance. Presenting the information clearly on a single page and choosing sensible default emission factors were key design considerations.
What's next?
We plan to extend the tool to include other activities like home heating, water usage and waste, add multi-language support, and provide features to encourage users to save and share their results.
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