Carbon Footprint Calculator
Estimate carbon footprint
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Carbon Footprint Calculator turns the numbers behind estimating carbon footprint into an instant, step-by-step result. Type Monthly Electricity (kWh), Monthly Gas (L) and Monthly Driving (km) into Carbon Footprint; each keystroke re-runs the math. Nothing in Carbon Footprint is a black box. Carbon Footprint replaces guesswork. Nothing typed into Carbon Footprint leaves your device or the tab. Carbon Footprint sits in the Everyday Life section next to free online carbon footprint calculator and carbon footprint calculator. Carbon Footprint is great for comparing scenarios. Change one value and watch. Start with Carbon Footprint; the first number takes seconds.
What is my carbon footprint per month?
A household footprint is the sum of a few measurable things: electricity in kilowatt-hours, gas in litres or therms, and distance driven. Showing them separately matters more than the total, because the biggest line is the only one worth changing first.
Gas is the largest single line at 230 kg, despite being the smallest input by unit.
The formula
CO₂ = (electricity × 0.5) + (gas × 2.3) + (distance × 0.2)
Each input is multiplied by an emission factor: 0.5 kg CO₂ per kWh of electricity, 2.3 kg per cubic metre of natural gas, and 0.2 kg per kilometre driven. The factors come from average grid intensity and average vehicle efficiency, which is why the same numbers give a rough estimate rather than your exact footprint.
Worked examples
500 kWh, 100 m³, 1,000 km → 680 kg/month
250 kWh → 555 kg
1,000 kWh → 930 kg
50 m³ gas → 565 kg
200 m³ gas → 910 kg
2,000 km → 880 kg
Gas is the most emission-dense input per unit: 100 m³ of gas produces 230 kg, while 100 kWh of electricity produces 50 kg. A home heated by gas usually finds that heating dominates the total, and a home on a low-carbon grid finds that driving does.
Why the factors vary so much
Grid intensity depends on where you live and when you use power. A grid dominated by hydro or nuclear can be under 0.1 kg per kWh; one dominated by coal can exceed 0.8. The 0.5 default is a mid-range figure, so a French or Norwegian user will see an overestimate and a coal-heavy grid an underestimate.
Vehicle emissions depend on fuel type and driving conditions. A petrol car averages around 0.2 kg per km, a diesel slightly less per km but with other pollutants, an electric car depends entirely on the grid that charges it, and a short urban trip emits more per km than a steady motorway run because the engine never reaches efficiency.
What is not counted
Flights, food, shopping, water heating and household waste are all significant and all absent. A single return long-haul flight can exceed a month of the totals here, which is why a footprint built only from home energy and driving understates a typical lifestyle. Use this as a household energy baseline, not a complete inventory.
The annual figure is simply the monthly total times twelve. It assumes the month you entered is typical; heating in winter can be several times the summer figure in a gas-heated home.
Frequently Asked Questions
How much CO₂ do 500 kWh of electricity produce?
About 250 kg at the 0.5 kg per kWh default. The real figure depends on how your grid generates power.
Why is gas such a large part of the total?
Natural gas emits about 2.3 kg per cubic metre, so 100 m³ produces 230 kg — nearly as much as 500 kWh of electricity.
How accurate is this estimate?
It is a rough baseline. Grid intensity and vehicle efficiency vary widely by location, so treat the result as indicative and replace the factors with local ones if you have them.
Are flights included?
No. One return long-haul flight can exceed a month of these totals, so add travel separately for a complete picture.
Why does the annual figure multiply by 12?
It assumes the month you entered is typical. In a gas-heated home, winter months can be several times the summer figure.
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