Home Carbon Footprint Calculator 2026: Energy & Driving
Estimate your household's yearly CO2 from electricity, gas heating and driving, then see how solar, an EV and a heat pump could cut it. Free 2026 calculator.
Estimate scope & data quality
This tool provides an input-driven estimate. Use the required inputs shown above and review the result limitations below.
- Data quality
- NOT_AVAILABLE
- Result limitation
- Calculator output is not a source-complete customer result.
A tariff credit is distinct from annual savings. If a result is NOT_COMPUTABLE or CONFLICT, it must not be replaced with an estimate or treated as canonical.
How to use this calculator
- Enter your monthly electricity usage in kWh from your utility bill.
- Enter your annual natural gas usage in therms (enter 0 if you have no gas service).
- Open the transportation inputs and enter annual driving miles and your vehicle's MPG.
- Read your total annual CO₂ emissions in tonnes, split by electricity, gas and driving.
- Compare the modeled footprint with solar, an EV and a heat pump to see the potential reduction.
Understanding your results
How the footprint is calculated. Electricity = monthly kWh × 12 × 0.386 kg CO₂/kWh (EPA average US grid factor). Gas = therms × 5.3 kg CO₂/therm. Driving = miles ÷ MPG × 8.887 kg CO₂/gallon of gasoline (EPA). At the defaults (899 kWh/mo, the EIA 2022 US average; 600 therms; 13,500 miles at 30 MPG) that is 4.2 + 3.2 + 4.0 ≈ 11.3 tonnes CO₂ per year.
The “solar + EV + heat pump” scenario is a simplified model: grid electricity falls to 0.05 kg CO₂/kWh (most household use covered by rooftop solar), gas use falls by 70% (a heat pump replaces most gas heating), and driving switches to an EV using 1 kWh per 3.5 miles charged at the average grid factor. At the defaults the footprint drops to about 3.0 tonnes, an 8.5-tonne (≈74%) reduction. It does not add the heat pump’s extra electricity or manufacturing emissions, so treat it as an upper-bound estimate.
Costs changed in 2026, the carbon math did not. The federal 30% residential solar credit (§25D) and the §25C heat pump credit ended for installations completed after Dec 31, 2025, and the §30D/§25E EV credits ended for vehicles acquired after Sep 30, 2025 (IRS OBBB FAQs). The emissions reduction from each upgrade is the same; the payback is longer. Use the solar savings, heat pump and EV calculators to check the cost side, and check your state energy office for rebates that are still open.
Frequently asked questions
Direct answers for US homeowners.