Methodology

Personal carbon footprint calculator

Our quiz uses simplified models based on common lifestyle patterns. You answer questions about home energy use, transportation (including flights and car use), and diet. We apply industry-standard emission factors to estimate your annual CO₂ equivalent (CO₂e) in tonnes per person per year.

This is an estimate, not a scientific audit. Individual circumstances vary. Use it as a starting point for awareness and action.

Country emissions data

Country-level metrics (CO₂ per capita, consumption-based emissions, electricity carbon intensity, renewables share) come from Our World in Data and similar datasets. We use territorial (production-based) emissions as the primary metric for country comparisons, plus consumption-based data where available.

Data years vary by country and metric. Some countries report with a lag; small economies may have patchy coverage. See our data sources page for dataset details and update frequency.

Limitations

• Rankings can differ between sources due to data years and methodology.
• Territorial vs consumption-based metrics tell different stories; we show both where available.
• Small countries with unusual economies (aviation hubs, fuel re-exports) can skew per-capita figures.
• Our calculator uses average emission factors; your actual footprint depends on your specific choices.