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Carbon Footprint Calculator

Calculate Your Carbon Footprint
Disclaimer:
These spreadsheets and associated materials have been prepared with a high degree of expertise and professionalism, and it is believed that they provide a useful and accurate approach for calculating greenhouse gas emissions. However, the organizations involved in their development collectively and individually, do not warrant these spreadsheets for any purpose, nor do they make any representations regarding their fitness for any use or purpose whatsoever.
Description
Estimate your monthly greenhouse gas (GHG) emissions from home heating, personal travel by passenger vehicle & airplane, and electricity in the United States and the United Kingdom, using emission factors developed for the GHG Protocol by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD). We use emission factors developed by the USEPA for electricity in the United States. 
What’s Included
  • Home Heating — emissions from heating oil, coal, natural gas, and biodiesel.
  • Home Electricity — emissions from household 
electricity use.
  • Vehicles — emissions from cars, vans, light- and medium-duty trucks, and motorbikes (based on either fuel use 
or distance, depending on country).
  • Flights — emissions from jet fuel used in air travel.
How Calculations Work
Heating fuels
  • – Convert user inputs of fuel usage into standard units (litres, tonnes, or cubic meters);
  • – Multiply by the emission factors of the fuel for 3 GHG (CO₂, CH₄, and N₂O);
  • – Convert the individual emissions to equivalent CO₂ (CO₂-e) by Multiplying by Global Warming Potential for 100-Year Horizon (GWP100) factors per IPCCC Assessment Report, 2014 (AR5), IPCC — Intergovernmental Panel on Climate Change;
  • – Convert to metric tonnes (tCO₂-e);
  • – Sum the tCO₂-e of the 3 GHG for the total carbon emissions for the user-specified fuel usage.
Home Electricity
  • – USA → based on 2022 factors by zipcode from the USEPA;
  • – UK → based on 2023 national-average factors from WRI;
Vehicles
  • – Both fuel and distance traveled should be input by the user;
  • – If they enter fuel used, the system calculates CO₂ emissions directly using fuel-use factors;
  • – If they enter distance travelled, the system calculates CH₄ and N₂O emissions using per-distance factors (available only for USA and UK);
  • – The individual emissions for CO₂, CH₄ and N₂O will be converted to equivalent CO₂ (CO₂-e) by multiplying by the GWP-100 factors for each of the 3 ghg;
  • – Convert CO₂-e to metric tonnes (tCO₂-e);
  • – Sum the tCO₂-e of the 3 ghg for the total carbon emissions for the user-specified fuel usage.
Flights
  • Mileage-based. CO₂, CH₄ and N₂O emissions are included for US and UK air travel.
Conversion to CO₂-e
  • All gases are converted into CO₂ equivalent (CO₂-e) using global warming potentials (GWP100, IPCC AR5): CH₄ = 28; N₂O = 265.
Total CO₂-e
  • All gas emissions are converted to metric tonnes tCO₂-e and added together.
How to Use
  1. Start with the Intro tab: Select your Country.
  2. Go through the tabs step by step: Home Heating → Home Electricity → Vehicles → Flights → Summary
  3. Enter your usage in the requested units (litres, kWh, miles, etc.) and time period.
  4. On each tab, the calculator will validate your inputs 
and apply the correct emission factors from the WRI or EPA tables. As a result, you will see the subtotal in tCO₂-e 
at the bottom.
  5. At the bottom of every tab, you’ll see a Next button 
to continue.
  6. On the final Summary tab, you’ll see your monthly footprint total, a breakdown by category, and practical recommendations to reduce it.
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