Learn how we calculate your carbon footprint and the science behind our estimates.
Last Updated: March 26, 2026
The Green Footprint Calculator estimates your personal carbon dioxide equivalent (CO₂e) emissions based on your energy use, transportation, diet, and waste production. Our calculations use peer-reviewed emission factors from authoritative sources, country-specific energy mixes for accurate electricity emissions, transparent assumptions documented for each category, and science-based methodologies aligned with international standards.
Included: Included Categories: Home Energy (Electricity and natural gas consumption), Transportation (Personal vehicle use, air travel, public transit), Diet (Food consumption based on diet type), Waste (Landfill waste production)
Excluded: Excluded Categories: Embodied carbon in goods (except food), Indirect emissions from services, Water usage and treatment, Scope 3 emissions from supply chains
Our calculations use peer-reviewed emission factors and country-specific data to estimate your carbon footprint across four main categories. Each calculation accounts for regional variations and current energy grid composition.
We use data from authoritative international organizations including the International Energy Agency (IEA), IPCC, EPA, DEFRA, FAO, and World Bank Carbon Pricing Dashboard.
Our calculations are based on standard assumptions about grid stability, vehicle efficiency, diet consistency, waste composition, and shared emissions. These assumptions are documented and can be reviewed.
Results are estimates with ±15-25% accuracy depending on input precision and regional variations. Our calculator does not account for embodied carbon in goods, individual consumption variations, or Scope 3 supply chain emissions.
The carbon price shown is an illustrative estimate used to frame the economic impact of your emissions. It does not affect your calculated footprint and is based on recent carbon market prices.
We are committed to transparency in carbon accounting. All emission factors, assumptions, and methodologies are documented and can be reviewed. Version 1.0 (March 26, 2026). Next Review: March 26, 2027