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Fuel CO2 Calculator

CO₂ emitted by burning petrol, diesel, gas or heating oil, per litre and per journey.

Also known as petrol co2 calculator, diesel emissions, fuel emissions calculator.

Enter values

Results update as you type.

Result

CO₂ emitted

2,772 kg

In tonnes
2.772
Emission factor
2.31 kg per unit
Per month
231 kg
Trees to offset
132
Equivalent electricity at 233 g/kWh
11,897 kWh

About the Fuel CO2 Calculator

CO₂ emitted by burning petrol, diesel, gas or heating oil, per litre and per journey.

Also known as: petrol co2 calculator, diesel emissions, fuel emissions calculator, co2 per litre.

How to use this calculator

  1. Enter fuel, amount used.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Fuel CO2 formula

kg CO₂ = litres × emission factor

Worked example

Using the values pre-filled in the calculator above:

  • Fuel: Petrol (2.31 kg/L)
  • Amount used = 1,200 litres or kWh per year

the calculator returns:

  • CO₂ emitted: 2,772 kg
  • In tonnes: 2.772
  • Emission factor: 2.31 kg per unit
  • Per month: 231 kg