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Carbon Footprint Calculator

Estimate your yearly CO2 footprint from transport, home energy, diet and shopping.

Related tools

All Consumption & comfort tools →
Flight carbon footprint calculatorEstimate the CO₂ emissions of a flight from its distance.Water Usage CalculatorEstimate your household's daily, monthly and yearly water use from showers, toilets, laundry, dishwasher and more.Electricity consumption calculatorWork out an appliance's energy use in kWh.Heat index calculatorFind the 'feels-like' temperature in hot, humid weather.Wind chill calculatorFind the 'feels-like' temperature in cold, windy weather.

Carbon Footprint Calculator is free to use as often as you like, directly from this page. Its place is under Consumption & comfort; Flight carbon footprint calculator and Water Usage Calculator answer the questions closest to this one.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Carbon Footprint Calculator?

Estimate your yearly CO2 footprint from transport, home energy, diet and shopping.

When would I actually use this?

Putting a number on what something costs or feels like: an appliance's share of the bill, a flight's emissions, a household's footprint, or how cold the wind actually makes it.

What is the most common mistake?

Reading a nameplate rating as an average. A 2000 W appliance draws that at full load, not continuously — a fridge rated at 150 W runs a fraction of the hour, so its yearly cost is nowhere near 150 W times 8760.

How is Carbon Footprint Calculator different from Flight carbon footprint calculator?

They sit next to each other but answer different questions: Flight carbon footprint calculator is the one to open when you need it to estimate the CO₂ emissions of a flight from its distance. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Water Usage Calculator is the closest one after this: Estimate your household's daily, monthly and yearly water use from showers, toilets, laundry, dishwasher and more.

Where do the figures come from?

The arithmetic is exact for the rating and tariff you enter. Emission factors come from published national inventories and differ by a factor of several between electricity grids, so a footprint is only as local as the factor behind it.

Further reading

All guides →
ExplainerWind Chill: What the “Feels Like” Number Actually MeasuresThe calculator runs the 2001 index, not the 1945 one, and refuses to answer above 50 °F or under 3 mph. Here is what its number is a model of — bare skin, in shade, walking — and the two things it says nothing about: a clothed body, and a parked car.ExplainerHow Much Electricity Do Appliances Use? Watts, kWh and CostHow watts turn into kilowatt-hours, what typical appliances draw, and how to translate that consumption into a cost on your bill.ExplainerWhat Is the Heat Index? Why It Feels Hotter Than It IsThe heat index combines air temperature and humidity into a single 'feels-like' number, and explains why a humid 90-degree day can be dangerous.ExplainerDew Point: What It Is, and How the Calculator Gets ItMagnus–Tetens with the Alduchov–Eskridge coefficients, 17.625 and 243.04. Why an absolute number beats relative humidity for judging comfort, what temperature a window has to reach before it runs, and the one input the calculator does not check.ExplainerYour Flight's Carbon Footprint, ExplainedHow much CO₂ does a flight emit? Learn the per-passenger-kilometre figures, why short hops are worst per mile, and what the numbers really mean.How-toHow Much Does an Appliance Cost to Run? A Simple MethodTurn an appliance's wattage and daily hours into an annual running cost using one formula: power times hours times your price per kWh.