Carbon Footprint Calculator
Estimate your annual carbon footprint in tonnes of CO2e from car miles, flights, home electricity, and diet.
Rough factors: driving 0.404 kg/mile, flying 0.25 kg/mile, US grid electricity 0.417 kg/kWh, and a whole-diet estimate of 2.5 t/yr for the selected diet. Real footprints vary a lot; treat this as a ballpark, not an audit.
How it works
Your footprint is the sum of the greenhouse gases tied to how you live. This tool covers four of the biggest personal drivers — driving, flying, powering your home, and what you eat — and adds them into a single yearly total in tonnes of CO₂e.
It uses rough, commonly cited factors: about 0.404 kg of CO₂ per mile driven, 0.25 kg per mile flown, 0.417 kg per kWh of US grid electricity, and a whole-diet estimate that ranges from about 1.5 tonnes for a vegan diet up to 3.3 for a meat-heavy one.
The result is a ballpark for comparing choices, not an audit. Cutting a long flight or trimming grid electricity will visibly move the number, which is the point — you can see where your biggest levers are.
Frequently asked questions
What does CO2e mean?
CO₂e, or carbon dioxide equivalent, rolls up all greenhouse gases into a single figure by weighting each one by how much warming it causes relative to carbon dioxide. It lets you add up very different emissions on one scale.
Why is diet a single dropdown instead of detailed inputs?
Food emissions are hard to itemise accurately, so this uses published whole-diet averages by eating pattern. It captures the big difference between, say, a meat-heavy and a vegan diet without asking you to log every meal.
How does this compare to a typical footprint?
The global average is roughly 4 tonnes per person, while the US average is closer to 15. Wealthier, high-travel lifestyles land higher. Use the breakdown to spot which category is inflating your own total.