🌍 Carbon Footprint Calculator
Add up your home energy, driving, flights, and diet to see your annual carbon footprint in kilograms and tonnes of CO2 — plus what it works out to per day, so you can spot the biggest levers to cut.
🌍 Estimate Your Annual CO2
What is a Carbon Footprint Calculator?
A carbon footprint is the total amount of greenhouse gases — measured in carbon-dioxide equivalent (CO2e) — that your activities release into the atmosphere over a year. This calculator turns a handful of everyday numbers into that total by applying documented emission factors to your electricity, natural gas, driving, flights, and diet, then breaking the result down source by source.
Seeing where your emissions come from is the first step to reducing them. Use it to compare choices — a plant-forward diet, an electric car, fewer flights, or a greener electricity plan — and to track your progress over time. The figures are planning estimates based on averages, not a certified audit.
❓ Frequently Asked Questions
How does the carbon footprint calculator work?
It multiplies each part of your lifestyle by a documented emission factor and adds them up. Home electricity is counted at 0.417 kg CO2 per kWh, natural gas at 5.3 kg per therm, and driving at 0.404 kg per mile. Flights are estimated at 250 kg for a short-haul trip and 1,100 kg for a long-haul one, and your diet contributes a yearly baseline (roughly 1,500 kg for vegan up to 3,300 kg for a heavy-meat diet). The total is shown in kilograms and tonnes of CO2e, plus a per-day figure.
What is a good carbon footprint per person?
The global average is around 4 tonnes of CO2 per person per year, but it ranges from under 2 tonnes in many lower-income countries to 15 tonnes or more in the United States and other high-consumption economies. Climate scientists estimate that keeping warming in check means bringing individual footprints down toward roughly 2 tonnes by mid-century, so most people in wealthy countries have significant room to cut.
Which everyday choices cut the most emissions?
For most households the biggest levers are flying less (a single long-haul return trip can rival a tonne of CO2), driving less or switching to an electric vehicle, cutting home energy use and greening your electricity supply, and shifting toward a more plant-forward diet. Small habits help, but these high-impact changes move the number the most.
Are these emission factors exact?
They are widely-cited averages, not a personalised audit. Your real footprint depends on your local electricity grid mix, your specific car and flights, and how your food is produced. Treat the result as a planning estimate to compare choices and track progress, not a precise ledger.