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Personal Carbon Footprint

Free Personal Carbon Footprint calculator with clear step-by-step results.

About Personal Carbon Footprint

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.

Formulas

Car emissions

tCO2e = km x gCO2e per km / 1,000,000

Household share

tCO2e = kWh x intensity / 1,000,000 / household size

Worked example

With the default values below, Personal Carbon Footprint returns Total annual footprint of 9.925. Change any input above and every figure here is recalculated in your browser.

Inputs used

Car travelminimum 0 km/year
12,000 km/year
Car emissionsminimum 0 gCO2e/km
150 gCO2e/km
Hours flownminimum 0 h/year
10 h/year
Household energyminimum 0 kWh/year
9,000 kWh/year
Energy carbon intensityminimum 0 gCO2e/kWh
250 gCO2e/kWh
Diet footprintminimum 0 tCO2e/year
2 tCO2e/year
Goods and servicesminimum 0 tCO2e/year
2.5 tCO2e/year
People sharing the household energyaccepts 1–12
2

Results

Total annual footprint
9.925 tCO2e
Transport component
4.300 tCO2e
Your share of household energy
1.125 tCO2e
Transport as a share of the total
43.3% %

Step by step

  1. 1Values used
  2. 2Car emissions
  3. 3Household share
  4. 4Total annual footprint= 9.925 tCO2e
  5. 5Transport component= 4.300 tCO2e
  6. 6Your share of household energy= 1.125 tCO2e
  7. 7Transport as a share of the total= 43.3 %

Assumptions and limits

  • The result is derived only from the 8 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or fees or charges into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How does my footprint compare?

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.

Why is flying charged per hour?

Fuel burn is roughly proportional to time aloft once cruising, which makes hours a better proxy than distance for short flights where takeoff dominates.

Related Calculators

Personal Carbon Footprint – Calculate Total annual footprint