Home Carbon Footprint Calculator

How much CO₂ does your household really put out each year? Plug in your electricity, heating, driving, flights, and diet — this calculator estimates your annual carbon footprint in tonnes of CO₂-equivalent and shows exactly where it's coming from, so your cuts land where they count.

Your household

Monthly electricity use (kWh) Check a recent utility bill. US household average is roughly 900 kWh/month.

Heating fuel

None / mild climate Natural gas Heating oil Propane

Your car

Gasoline Electric / plug-in No car

Miles driven / week

Car's MPG

Short flights / year Round trips under ~3 hours.

Long flights / year Round trips over ~3 hours.

Diet Includes food production emissions, not just your grocery bill.

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Your footprint

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Where it comes from

Your biggest wins

How the math works

These are the emission factors this calculator uses — widely published figures, rounded for sanity. Nothing here is invented, and the results are estimates, not measurements.

Source	Factor used	Source of factor
Electricity	0.85 lb CO₂e per kWh	EPA eGRID, US average
Natural gas	11.7 lb CO₂e per therm	EPA emission factors
Heating oil	22.6 lb CO₂e per gallon	EPA emission factors
Propane	12.6 lb CO₂e per gallon	EPA emission factors
Gasoline	19.6 lb CO₂e per gallon	EPA emission factors
Electric car	0.34 kWh per mile × grid factor	Typical EV efficiency × EPA eGRID
Short-haul flight	0.2 tonnes CO₂e per round trip	ICAO/myclimate-style estimates, economy
Long-haul flight	1.0 tonnes CO₂e per round trip	ICAO/myclimate-style estimates, economy
Diet	Meat-heavy 2.6 · Average 1.7 · Vegetarian 1.2 · Vegan 0.9 tonnes/yr	Poore & Nemecek / Our World in Data, rounded
US household average	16 tonnes CO₂e per year	EPA (average American ~16 t)

Caveats: electricity grids vary a lot by region (your utility's mix may be cleaner or dirtier than the national average), flight factors ignore contrail effects, and the diet numbers are per-person averages. The point is direction, not the third decimal place — the biggest category is where your effort pays.