Methodology

Simple estimates, clear results.

iFootprint uses the original calculator assumptions from the working site and converts common household activities into annual pounds of CO₂.

Home energy

Electricity, natural gas, and fuel oil are estimated from monthly bills, household size, and unit prices.

Weekly waste is converted to an annual emissions estimate, with a reduction applied for recycling behavior.

Driving is based on annual miles and MPG. Flying is based on annual miles flown.

Eating habits are represented as a simple meat-consumption estimate.

This calculator is intended for general education and awareness. It is not a formal audit or regulatory reporting tool.