Answer 12 quick questions about your lifestyle and discover your annual CO2 emissions. See how you compare to the world — and what you can do about it.
Takes about 2 minutes. No signup required.
These are rough estimates based on averages. Actual emissions depend on many factors including location, energy grid mix, and specific habits. Use this as a starting point, not a precise measurement.
The Carbon Footprint Calculator is a free online tool that estimates your annual CO2 emissions based on your lifestyle choices. Answer 12 questions across four categories — transportation, home energy, food, and consumption — and get an instant breakdown of your environmental impact. See how your footprint compares to global averages, the Paris Agreement target, and other countries around the world.
Each question maps to a scientifically estimated amount of CO2 emissions in tons per year. Your answers are combined to produce a total annual carbon footprint. The calculator then compares your result against international benchmarks, shows how many Earths would be needed if everyone lived like you, and provides personalized tips for reducing your emissions based on your biggest contributing categories.
Your carbon footprint is the total amount of greenhouse gases you produce annually, measured in tons of CO2 equivalent. It includes emissions from transportation, home energy use, diet, and consumption habits. The average American produces about 16 tons per year, while the global average is roughly 4.7 tons.
The global average carbon footprint is approximately 4.7 tons of CO2 per person per year. However, this varies widely: the US average is 16 tons, the EU average is 6.8 tons, China is 7.4 tons, India is 1.9 tons, and the UK is 5.5 tons. The Paris Agreement target is about 2 tons per person.
The most impactful ways to reduce your carbon footprint include switching to public transit or cycling (saves 2–4 tons/year), switching to renewable energy at home (saves up to 2 tons/year), reducing beef consumption (saves ~0.8 tons/year), and buying fewer new items. Even small changes like reducing food waste and buying local produce make a difference.
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Last updated: March 2026 · whatifs.fun — Free interactive games, experiments & simulations