Carbon Calculator How big is your carbon footprint?

  1. 1 Calculate
  2. 2 Commit
  3. 3 Contribute

Calculate your footprint

For individuals · housing, travel and consumption

Free · 5 min · 2.4M have taken the test

Calculating for a company? Go to the business calculator

How it works

  1. 1

    Calculate

    Answer questions about housing, travel and consumption. Takes about 5 minutes.

    Answer questions about housing, travel and consumption. About 5 min.

  2. 2

    Commit

    Get personal tips that cut your footprint.

  3. 3

    Contribute Optional

    Support climate projects for what you can't reduce. From $9.

Safe drinking water project in Uganda

Example climate project

Clean water · Uganda

New wells reduce the need to boil water, which protects the forest and cuts emissions.

Free · 5 min · 2.4M have taken the test

Carbon calculation: what is a carbon footprint?

Your carbon footprint is the amount of greenhouse gases your lifestyle causes in a year, measured in tonnes of carbon dioxide equivalent (CO₂e). It includes carbon dioxide and other gases, such as methane, converted into the same unit based on how much they warm the climate.

Your own footprint is only part of the picture. Encouraging friends to cut theirs and taking part in the public debate, for example on a carbon tax, can also bring carbon dioxide levels down.

How the carbon calculator works, and where to start

ClimateHero's carbon calculator asks simple questions in three areas: housing, travel and consumption. It takes about 5 minutes. From your answers it estimates your yearly emissions in tonnes of CO₂e and shows which areas weigh the most for you, so you know where to start. The calculator works for the UK, Ireland, Australia, New Zealand, Canada, the US, the Philippines, India and many other countries.

If you'd like to understand CO2e better, try our CO2 emissions calculator.

How to cut your carbon footprint at home, on the move and when you shop

At home: insulate where you can, switch to heating and hot water that don't run on fossil fuels, and choose a renewable electricity tariff or generate your own.

On the move: walk, cycle or take public transport for short trips, share car journeys, and think twice about flights you could avoid.

Food and shopping: eat less beef and lamb, use up the food you buy, and choose second-hand or longer-lasting things.

Want to go further? With a monthly subscription, you fund Gold Standard certified climate projects that cut emissions equal to twice what you can't avoid yet. On the results page you can include everyone in your household.

Carbon footprint: frequently asked questions

How do I calculate my carbon footprint?

Take each activity that causes emissions, such as the kilowatt hours of electricity you use, the kilometres you drive or fly, or what you eat, and multiply it by an emission factor: how many kilos of CO₂e each unit produces. Add everything up and you have your yearly carbon footprint in tonnes of CO₂e. Want the details? Read how we calculate your footprint in our FAQ.

Is a carbon footprint the same as CO2 emissions?

Almost, but not quite. CO2 emissions are carbon dioxide only. In everyday use, a carbon footprint adds up all greenhouse gases, such as methane and nitrous oxide, converted into CO₂ equivalent (CO₂e). That's why your carbon footprint is usually a bit higher than your CO2 emissions alone.

Is the calculator free, and how long does it take?

Yes, it's free to use, and the test takes about 5 minutes. You see your result as soon as you finish.

What is the average carbon footprint?

It varies a lot between countries. According to the IPCC, in 2019 about 35 % of the world's population lived in countries emitting more than 9 tonnes of CO₂e per person, and 41 % in countries emitting less than 3 tonnes. The average first result of people using ClimateHero's calculator in English is just over 9 tonnes of CO₂e a year. For comparison, a study by IEEP and the Stockholm Environment Institute for Oxfam (2021) estimates that keeping warming to 1.5 °C means an average of about 2.3 tonnes of CO₂ per person a year by 2030 (CO₂ only). It's not a target you hit overnight: what matters is knowing where you are today and moving step by step.