Carbon Footprint Calculator
Estimate your annual CO₂ emissions from energy, travel, and diet.
What is a Carbon Footprint?
A carbon footprint is the total amount of greenhouse gas emissions — measured in tonnes of CO₂ equivalent (tCO₂e) — caused directly and indirectly by an individual, organisation, or activity over a given period. The major contributors for most people in developed countries are home energy use, personal transport, air travel, and diet. Understanding your footprint is the first step toward reducing it through behaviour change, efficiency improvements, and carbon offsetting.
The global average carbon footprint is approximately 4–5 tonnes of CO₂ per person per year. The average in the United States is around 14–16 tonnes, while European averages tend to be 6–10 tonnes. To limit global warming to 1.5°C, scientists suggest individuals need to reduce their footprints to approximately 2.5 tonnes per year by 2030. This calculator uses widely accepted emission factors from sources including the IPCC and UK Government's greenhouse gas conversion tables. All processing is done locally — your data never leaves your browser.
How to Use
- Fill in your monthly home energy usage (electricity in kWh, gas in therms).
- Enter your weekly driving distance and vehicle type, plus public transport usage.
- Enter how many short and long-haul flights you take per year and your typical cabin class.
- Select your primary diet type.
- Click ✨ Calculate to see your total footprint broken down by category.