Household Carbon Footprint Calculator
Your household carbon footprint is the total greenhouse gas emissions produced by your home energy use and personal vehicle travel, measured in metric tons of carbon dioxide equivalent (CO2e) per year. Electricity generation, natural gas combustion for heating, and driving are the three largest controllable sources for most US households. This calculator applies EPA emission factors: 0.386 kg CO2e per kWh of electricity (EPA eGRID 2023 national average), 5.309 kg CO2 per therm of natural gas, and 0.404 kg CO2 per mile driven for a typical passenger car. Enter your annual totals to see your combined footprint.
Carbon footprint formula
Electricity CO2e = kWh/yr * 0.386 kg/kWh / 1000
Gas CO2 = therms/yr * 5.309 kg/therm / 1000
Vehicle CO2 = miles/yr * 0.404 kg/mile / 1000
Total = Electricity CO2e + Gas CO2 + Vehicle CO2 (metric tons/yr)
All results are expressed in metric tons of CO2 equivalent per year. The electricity factor of 0.386 kg CO2e/kWh is the EPA national average from eGRID 2023. The natural gas factor of 5.309 kg CO2/therm and vehicle factor of 0.404 kg CO2/mile come from EPA Greenhouse Gas Emission Factors (2024).
Understanding your carbon footprint
- The average US household emits roughly 7 to 8 metric tons of CO2e per year from home energy and driving alone (EPA).
- Switching to renewable electricity (green tariff or rooftop solar) can eliminate the electricity portion of your footprint.
- Improving home insulation and upgrading to a heat pump can cut natural gas emissions by 50 to 90 percent.
- Electric vehicles eliminate direct tailpipe emissions; upstream electricity emissions depend on your grid mix.
- This calculator covers direct energy use only. Total lifecycle footprints including food, goods, and services are typically 2 to 3 times higher.
Frequently asked questions
What emission factors does this calculator use?
Electricity uses the EPA national average of 0.386 kg CO2e per kWh (eGRID 2023). Natural gas uses 5.309 kg CO2 per therm (EPA). Vehicle miles use 0.404 kg CO2 per mile for a typical passenger car (EPA).
What is CO2e?
CO2e stands for carbon dioxide equivalent. It converts all greenhouse gases (methane, nitrous oxide, etc.) into an equivalent amount of CO2 based on their global warming potential, allowing for a single combined emissions figure.
What is the average US household carbon footprint?
According to EPA data, the average US household emits roughly 7 to 8 metric tons of CO2e per year from energy use at home and personal vehicle travel, not counting food, goods, or services.
How can I reduce my household carbon footprint?
The EPA Green Power Partnership and ENERGY STAR programs recommend switching to renewable electricity, improving home insulation, upgrading to efficient appliances, and reducing driving or switching to an electric vehicle.
Does this calculator include food and consumer goods?
No. This calculator covers the three largest direct energy sources: electricity, natural gas, and driving. Food and manufactured goods require lifecycle assessment data and are outside this tool's scope.
Official sources
- EPA: Greenhouse Gas Equivalencies Calculator.
- EPA eGRID: Emissions and Generation Resource Integrated Database.
- EPA: GHG Emission Factors Hub (2024).
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.