estimate one year of personal or household carbon emissions（t CO₂）。enter electricity use、driving、gas and flight data suffice，free、no registration required。
this tool uses common default factors：grid electricity use 0.5703 kg CO₂/kWh（national grid average）、fuel car 0.18 kg/km、natural gas 2.16 kg/m³、civil aviation 0.15 kg/km。actual factor varies with regional grid mix、varies by car model and cabin class。
electricity use is the majority，prioritizegreen electricity / rooftop PVinstead of grid power；use an EV for transport、carpooling and public transit；insulate well on the gas side。One tree absorbs about per year 18 kg CO₂，in the result"need to plant trees"for intuitive conversion only。On the enterprise side, combine electricity use and output for finer carbon accounting and green-certificate procurement。