How to Use the Daily Carbon Footprint Calculator
Select your primary transport mode and enter your daily travel distance, choose your typical diet type, and input your daily electricity and natural gas consumption. The calculator adds up the CO2 contributions from each source to give your total daily carbon footprint in kilograms. The annual total and tree offset equivalent help you visualize the cumulative environmental impact of your everyday choices.
Carbon Emission Factors (US Estimates)
| Source | Emission factor |
|---|---|
| Car (average) | 0.24 kg CO₂/km |
| Bus | 0.10 kg CO₂/km |
| Subway / metro | 0.04 kg CO₂/km |
| Electricity (US avg) | 0.386 kg CO₂/kWh |
| Natural gas | 2.0 kg CO₂/m³ |
| Meat-heavy diet | 7.5 kg CO₂/day |
| Mixed diet | 5.0 kg CO₂/day |
| Plant-based diet | 2.5 kg CO₂/day |
Highest-Impact Changes You Can Make
Switching from car to transit for daily commutes is one of the single largest personal carbon reductions available. Reducing meat consumption to 3–4 meals per week (instead of daily) cuts food-related emissions by 30–50%. On the energy side, switching to LED lighting, sealing drafts, and upgrading to a more efficient water heater compound over years of use.
Frequently Asked Questions
Check your monthly utility bill for total kWh, then divide by 30. A typical US single-person household uses 8–12 kWh per day.
Enter your total daily distance. If you commute 10 km each way, enter 20 km.
This tool is designed for everyday commuting. Long-haul flights have a much higher per-km emission factor and are best calculated with a dedicated flight carbon calculator.