Calculateur d'Empreinte Carbone — Formule
## How to Calculate Your Carbon Footprint
Your carbon footprint is the total greenhouse gas emissions from your activities, measured in metric tons of CO2 per year.
### Key Emission Factors
- **Electricity**: ~0.92 lbs CO2 per kWh (US average grid mix)
- **Natural Gas**: ~11.7 lbs CO2 per therm burned
- **Gasoline**: ~19.6 lbs CO2 per gallon combusted
### Formula
**Total CO2 (metric tons) = (Electricity CO2 + Gas CO2 + Driving CO2) / 2204.6**
Each source is computed from usage multiplied by its emission factor, then converted from pounds to metric tons.
Your carbon footprint is the total greenhouse gas emissions from your activities, measured in metric tons of CO2 per year.
### Key Emission Factors
- **Electricity**: ~0.92 lbs CO2 per kWh (US average grid mix)
- **Natural Gas**: ~11.7 lbs CO2 per therm burned
- **Gasoline**: ~19.6 lbs CO2 per gallon combusted
### Formula
**Total CO2 (metric tons) = (Electricity CO2 + Gas CO2 + Driving CO2) / 2204.6**
Each source is computed from usage multiplied by its emission factor, then converted from pounds to metric tons.
Exemple Résolu
A household uses 900 kWh of electricity per month, 50 therms of gas per month, and drives 12,000 miles per year in a 25 mpg vehicle.
- Electricity CO2: 900 * 12 * 0.92 = 9,936 lbs = 4.51 metric tons
- Natural Gas CO2: 50 * 12 * 11.7 = 7,020 lbs = 3.18 metric tons
- Driving CO2: (12000 / 25) * 19.6 = 9,408 lbs = 4.27 metric tons
- Total: 4.51 + 3.18 + 4.27 = 11.96 metric tons CO2/year