Household Carbon Emissions Calculator
Estimate the carbon dioxide emissions from your household's electricity and gas usage using an editable grid emissions factor.
Your results
Calculation breakdown
- Electricity emissions
- kg CO2e = kWh × grid emissions factor
- Gas emissions
- kg CO2e = MJ × gas emissions factor
Worked example
5,000 kWh of electricity at 0.79 kg CO2e/kWh and 20,000 MJ of gas at 0.0513 kg CO2e/MJ gives an estimated 4.97 tonnes of CO2e a year.
Assumptions
- Grid emissions factors vary significantly by state; use the current National Greenhouse Accounts factor for your state.
- Excludes transport, embodied and other lifestyle emissions.
- Default factors are indicative national averages, not a specific state or year.
Sources
How this calculator works
Enter your annual electricity usage in kWh and gas usage in MJ, along with the relevant emissions factors for your state, to estimate your household's annual carbon dioxide emissions in tonnes. Grid emissions intensity varies significantly by state, so update the factor to match your own electricity network.
Frequently asked questions
Where do I find my state's emissions factor?
The Australian Government publishes National Greenhouse Accounts factors by state; check the Department of Climate Change, Energy, the Environment and Water website.
Why does my state matter?
States with more coal-fired generation, such as Victoria, have a higher emissions factor per kWh than states with more renewables or gas.
Does this include transport emissions?
No, this covers household electricity and gas only; vehicle emissions would need a separate calculation.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.