Carbon Footprint Calculator
Estimate your annual carbon footprint from driving, electricity, heating, and air travel. Compare to US and world averages.
Inputs
Results
Annual CO₂ (tons)
12.5 tons
≈ 8 small cars
How to Use This Calculator
- Enter your monthly electricity usage in kWh from your utility bill.
- Input your monthly natural gas usage in therms.
- Enter annual vehicle miles driven.
- Review your estimated annual CO₂ equivalent emissions in metric tonnes.
- Use the category breakdown to identify your largest emission source and target reductions there first.
How the result changes with Monthly Electricity
| Monthly Electricity | Annual CO₂ (tons) |
|---|---|
| 1,000 | 13 tons |
| 3,500 | 25.52 tons |
| 6,500 | 40.54 tons |
| 9,000 | 53.06 tons |
What each input means
- Miles Driven / Year
- Total miles you drive per year. US average is ~13,500.
- Vehicle MPG
- Your vehicle's fuel efficiency in miles per gallon.
- Monthly Electricity
- US average is ~900 kWh/month.
- Monthly Natural Gas
- Monthly natural gas usage in therms. US average is ~50.
- Round-Trip Flights / Year
- Number of round-trip flights per year.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersMiles Driven / Year = 12000, Vehicle MPG = 28, Monthly Electricity = 900, Monthly Natural Gas = 50 = 5 input(s) provided
- Calculate Annual CO₂Annual CO₂12.5 = 12.5
- Calculate vs US Averagevs US Average = round((totalCO2 / usAverage) * 10000) / 10078.12 = 78.12
- Calculate Trees to Offset320 = 320
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