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There seem to be many online carbon / ecological / emissions / environment footprint calculators. What are some useful ones?
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Here are some calculators that can be used globally to calculate the environmental footprint of people, items, activities and even countries or the world!

Calculator TypeInputsOutputsOrganisationNotes
Individual ecological footprint calculatorFood, housing, transportationNumber of Earths used & your personal Earth overshoot dayGlobal Footprint NetworkNeeds email address or Facebook account to use
Household carbon footprint calculatorTravel, home, food, goods, servicesUsed CO2/year & comparison with households in selected home countryCoolClimate NetworkMay take a few seconds to load
Food climate change calculatorFood item, consumption per weekYour consumption's annual greenhouse gas emissions and water & land use, and comparison with similar foodsBBC
Transport emissions calculatorDrive, walk, cycling, public transitCO2 equivalent for transport routeMap My EmissionsUses commercially available tools to find route
Flight emissions calculatorFlight detailsCO2 for flight routemyclimate
Cruise emissions calculatorCruise detailsCO2 for cruisemyclimate
Event emissions calculatorMobility, accommodation, catering, energy, material, transport, wasteCO2 for eventmyclimate
Business emissions calculatorEnergy, mobility, board, material, wasteAnnual CO2 for companymyclimate
Vegan & vegetarian calculatorYears or months of being vegan or vegetarianNumber of animals, CO2, forest, grain, water savedVegan Calculator
Country environmental footprint calculatorFootprints of carbon, fossil energy, land & water of a nation (total/per capita/GDP) and comparison with other nationsCarbon Footprint of Nations
Global climate change calculatorSelect or create a pathwayHow the pathway affects global GHG emissions, CO2 emissions & mean temperature change in 2100Click to view involved organisationsModel of the world's energy, land & food systems to 2050. See example use here

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Here are some environmental footprint calculators aimed at youngsters.

This kids calculator by ParkCityGreen.org is aimed at ages 4-9. It covers lights, entertainment, electricity, getting to places, baths, brushing teeth, recycling & garbage. It gives scores between 0-10 and tips with each question.

This youth calculator by the Inquiry to Student Environmental Action (I2SEA) project is aimed at ages 10-22. It covers home, food, purchases & transportation. It gives the used CO2/year (total & in each category) and compares with the average of the selected home country. Shows the carbon footprint of each answer as you go along.

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