Carbon Footprint Estimator

Household Energy

Electricity Grid Region

Factors sourced from national inventories (DEFRA/EnergyStar 2024).

Annual electricity use

kWh/yr

Annual natural gas / LPG

kWh/yr

Conversion: 1 m³ ≈ 10.55 kWh, 1 LPG cylinder ≈ 14.2 kg ≈ 184 kWh.

Custom fuel factor

kg CO₂e/kWh

Default from IPCC 2006 stationary combustion guidelines.

Transport

Personal vehicle distance

km/yr

Vehicle type

Short-haul flights

trips/yr

Typically < 1500 km. Factor: 0.158 kg CO₂e per passenger-km.

Short-haul distance

km/trip

Long-haul flights

trips/yr

Long-haul distance

km/trip

Factor: 0.111 kg CO₂e per passenger-km (ICAO average).

Lifestyle & Waste

Municipal waste disposed

kg/yr

Mixed waste to landfill, default factor 0.600 kg CO₂e per kg.

Waste emission factor

kg CO₂e/kg

Other activity (optional)

activity units

Use with custom factor below for flexible entries.

Custom emission factor

kg CO₂e/unit

📖 How to Use

Enter annual usage for electricity, fuels, transport, and lifestyle activities. Emission factors default to IPCC/DEFRA guidance and can be overridden for local data. The calculator aggregates CO₂-equivalent emissions using the GWP100 metric.

🧮 Formula Reference

Total CO₂e = Σ (Activity × Emission Factor × GWP100)
Electricity factors follow location-based Scope 2 guidance.
Flight emissions approximate ICAO passenger averages (<1500 km vs intercontinental).

⚠️ Notes

Use market-based electricity factors if you purchase renewables (enter your supplier’s value).
Long-haul flight factors include radiative forcing uplift (×1.9) as per DEFRA methodology.
For detailed inventories, split activities into Scope 1/2/3 and track refrigerants separately.