Free Personal Carbon Footprint calculator with clear step-by-step results.
Aggregates the five categories that dominate a personal footprint, dividing household energy by the number of people who share it rather than attributing all of it to one person. Flying is charged at roughly 250 kgCO2e per hour in the air, which is why a small number of long flights can outweigh a year of driving.
Car emissions
tCO2e = km x gCO2e per km / 1,000,000
Household share
tCO2e = kWh x intensity / 1,000,000 / household size
Global average is roughly 4-5 tCO2e per person, with high-income countries commonly at 8-16 and a Paris-aligned target near 2 tonnes by mid-century.
Fuel burn is roughly proportional to time aloft once cruising, which makes hours a better proxy than distance for short flights where takeoff dominates.