Carbon Footprint Calculator
How much CO₂ are you responsible for?
Answer a few questions. Get your number. Then do something about it.
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How the carbon footprint calculator works
Describe your home energy, travel, food and shopping in your own words, or fill in the form if you prefer not to use the AI chat. The assistant asks a follow-up question when an answer is unclear, then turns each activity into kilograms of CO₂e.
Every number comes from published emission factors, not from the AI: DEFRA 2026 for transport and fuels, national grid data for electricity, the FAO for food and the IPCC’s AR6 warming potentials for other greenhouse gases. Flights include the extra warming from contrails and nitrogen oxides. The method and every factor are published on the methodology and sources pages.
Your result shows where your emissions come from, how they compare with average footprints, and which changes would cut them most. It is an estimate with an uncertainty band, about ±15% for activity data, not an audited inventory.
For what you can’t cut yet, you can fund verified climate projects for the same amount: credits are retired in your name and you get a certificate.
Carbon footprint calculator: frequent questions
Is the carbon footprint calculator free?
Yes. The calculator is free and you don’t need an account. If you sign up, you can save your results in a free dashboard.
How accurate is the result?
It is a screening estimate. Figures based on activity data (kWh, km, kg) carry about ±15% uncertainty, and spend-based figures about ±30%. The more specific your answers, such as kWh from your bill or real flight routes, the closer the estimate.
What does the calculator cover?
Home energy, transport and flights, food, shopping and waste for individuals and households; trips and events; and Scope 1, Scope 2 and selected Scope 3 emissions for businesses.
Does the AI make up the numbers?
No. The AI only reads your answers and asks follow-up questions. Every number comes from the emission-factor database and simple multiplication, which you can check on the sources page.
What can I do with my result?
Start with the biggest categories in your breakdown: the calculator suggests the changes that cut the most. For the emissions you can’t avoid yet, you can buy verified carbon credits from €0.04 per kg, retired in your name.