How to Calculate Your Carbon Footprint

 

Use Online Calculators

  • Recommended Tools:

    • CoolClimate Calculator (UC Berkeley): Covers household, transportation, food, goods, and services in depth.

    • WWF Footprint Calculator: Simple interface with country‑specific insights.

  • What You’ll Need: Utility bills (electricity, gas), mileage or transit costs, average diet pattern (meat, vegetarian, vegan), shopping habits, and waste generation.

Manual Estimation

  • Transportation: Multiply annual car miles by your vehicle’s fuel efficiency and the CO₂ emission factor (about 8.887 kg CO₂/gallon of gasoline). Add public transit and flights (short, medium, long) using per‑mile factors.

  • Home Energy: Convert your kWh of electricity and therms of gas into CO₂ using your utility’s emission factors (often on your bill or website).

  • Diet & Consumption:

    • Food: Estimate based on diet type: omnivore (~2.5 t CO₂e/yr), vegetarian (~1.7 t), vegan (~1.5 t).

    • Goods & Services: A rule‑of‑thumb adds ~1–2 t for clothing, electronics, and leisure spending.

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