Household Carbon Footprint Estimator
Estimate your household’s annual CO2e from driving, home energy, flights, and diet, see it broken down by source, and find the single change that moves your number the most.
Find your biggest lever, not every gram
The point of a footprint estimate is not guilt over a single flight — it is spotting which part of your life carries the most carbon so your effort lands where it counts. For many households one long-haul flight, a gas furnace, or a long solo commute dwarfs a year of diligent recycling. Seeing the buckets side by side keeps you from optimising the small stuff while the big stuff goes unquestioned.
Drill into the largest bucket with the Home Energy Savings Calculator for electricity, or the Food Waste Cost Calculator for the food side.
Frequently Asked Questions
What goes into a household carbon footprint?
The big buckets are transport (the fuel your cars burn), home energy (electricity and natural gas), air travel, and food. Each is converted to kilograms of CO2e using a standard emission factor — about 8.9 kg per gallon of gasoline, 5.3 kg per therm of gas, and a grid factor for electricity — then summed and shown in tonnes. This tool covers those main sources; smaller ones like goods and services are not itemised.
How does diet affect the total?
Food is a real slice of most footprints, and it varies a lot by eating pattern. A meat-heavy diet carries roughly twice the annual emissions of a vegan one, with average, low-meat, and vegetarian patterns in between. The tool applies a typical annual figure for the pattern you pick rather than asking you to log every meal, so treat it as a category estimate, not a per-plate measurement.
How do I compare to the average?
The result shows your total as a percentage of the US per-capita average of about 16 tonnes of CO2e a year — one of the highest in the world. Being under 100% means you are below that benchmark, but the more useful signal is the breakdown: whichever bucket is largest is where a change will move your number the most, whether that is driving less, cleaning up your electricity, or flying less.
Is this an official carbon audit?
No. It is an educational estimate built from the figures you enter and standard average emission factors. A precise footprint depends on your local grid mix, your exact vehicle and flights, and detailed consumption data. Use this to understand the shape of your footprint and prioritise, not as a certified or offset-grade measurement.
Estimates only, based on the figures you enter and standard average emission factors. Not a certified carbon audit — use it to prioritise, not to offset.