My Carbon Footprint 🌍
20 questions to estimate your annual carbon footprint and discover the most effective levers to reduce it.
Sources & methodology
The DECA calculator uses the emission factors published by ADEME via the Nos Gestes Climat methodology, the official French tool based on Base Empreinte®. The thresholds for the 2 tCO₂/year per person target are based on the 6th IPCC report and the statistics from the International Energy Agency.
Go further: compare carbon footprint calculators, read the step-by-step calculation method, discover the average carbon footprint of the French in 2026 or consult a personalised action plan to reduce it. You can also see the world ranking of 228 countries or join the Décarmiens — the 1.09 billion people already under 2 t.