Carbon Footprint Estimator
Estimate your annual personal CO2e emissions from flights, car travel, home energy, diet and spending, broken down by category and compared against country per-capita averages, using published EPA/DEFRA/IPCC-style emission factors.
Input
Transport
Total annual passenger-km on flights under ~3,700 km. Leave blank for none.
Total annual passenger-km on flights over ~3,700 km.
Annual driving distance. Split across passengers if carpooling.
Household annual electricity consumption (divide by people if shared).
Household annual natural gas usage. 1 therm = 29.3 kWh = 100,000 BTU.
Electricity emission factor varies by country / grid mix.
Per-capita food emissions vary roughly 2x between heavy-meat and vegan diets.
Annual non-food consumer spending (clothing, electronics, services), ~0.3 kg CO2e per $.
Compare your total to a country's per-capita average.
Output
| Category | Value |
|---|---|
| No data yet | |
Guides
The Carbon Footprint Estimator gives a quick, category-by-category estimate of your annual personal carbon footprint — flights, car travel, home energy, diet, and everyday spending — and compares your total against country per-capita averages. It runs instantly in your browser; nothing you enter is sent to or stored on a server.
What it estimates
The tool multiplies each lifestyle input by a published emission factor (kg CO2-equivalent per unit) and sums the results into an annual total, broken down as:
- Transport — short-haul and long-haul flights (per passenger-km, with an adjustment for aviation's non-CO2 climate impact) plus car travel (per km, factored by vehicle type: gasoline, diesel, hybrid, plug-in hybrid, EV, or none).
- Home energy — electricity (per kWh, using a grid-mix factor that varies significantly by country) plus natural gas (per therm).
- Food / diet — an annual figure keyed to your general diet pattern, since food emissions vary roughly 2x between a heavy-meat diet and a vegan one.
- Goods & services — a rough per-dollar factor for non-food consumer spending.
The results also compare your total against a country (or the Paris Agreement per-capita target) and translate it into equivalents — mature trees absorbing carbon for a year, and gallons of gasoline burned — to make the number easier to picture.
Where the numbers come from
These are broad, published averages, not measurements of your specific footprint: aviation and car factors follow EPA- and DEFRA-style national averages; grid electricity intensities reflect IEA/EIA/Ember country averages; diet figures follow peer-reviewed food-system lifecycle research (in the spirit of Poore & Nemecek, Science 2018); country totals are approximate per-capita averages for a recent year.
Treat the output as a directional estimate — useful for seeing which parts of your lifestyle dominate your footprint and comparing scenarios (an EV, skipping a long-haul flight), not as a certified, audit-grade figure.
How to use it
- Fill in transport: flight distance (short-haul vs. long-haul) and annual car mileage with vehicle type.
- Enter home electricity and natural gas usage, and pick the grid region closest to yours.
- Choose the diet option matching your eating pattern, and estimate annual non-food spending.
- Pick a country (or the Paris Agreement target) to compare against.
Leave any field blank to exclude that category — blank or invalid entries are clamped to zero rather than causing an error, so a partial footprint (home energy only, say) works just as well as a full one. The table updates automatically as you type.
FAQ
Is this a certified carbon audit? No. It's a self-serve estimate built on published average emission factors, not a professional audit accounting for your actual bills, appliance efficiency, or flight routing.
Why does the same electricity usage produce different emissions in different countries? Grid mix varies enormously — a country generating power mostly from hydro or nuclear has a much lower factor per kWh than one relying on coal.
Does this tool store my data? No. All calculations happen locally in your browser. Nothing you type is transmitted to or saved on any server.