Calculating a car’s CO2 emissions from its mpg

February 22, 2010

Motorists who drive cars that were first registered before 2001 are unlikely to be aware of how much CO2 their vehicle emits.

A car’s V5 document (sometimes referred to as the logbook) details the amount of CO2 the vehicle emits per kilometre, but this is not the case for vehicles registered before 1st march 2001.

How to calculate CO2 g/km from mpg

If you know a car’s mpg figure, you can use a simple calculation to work out its CO2 g/km figure.

The calculation is simple, but you may find it helps to use a calculator.

How to calculate your cars CO2 emisionsKnowing only its mpg figure (in this example the car does 40mpg)
For petrol engines divide 6760 by 40 (the car’s MPG)169
For diesel engines divide 7440 by 40 (the car’s MPG)186
A petrol-engined car that does 40mpg has CO2 emissions of169g/km
A diesel-engined car that does 40mpg has CO2 emissions of186g/km


The ethical choice

The ETA was established in 1990 as an ethical provider of green, reliable travel services. Over 30 years on, we continue to offer cycle insurance , breakdown cover  and mobility scooter insurance while putting concern for the environment at the heart of all we do.

The Good Shopping Guide judges us to be the UK's most ethical provider.

{{cta-cycling}}

Information correct at time of publication.

Leave us a comment

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Comments
--
Name
2 days ago

Reply
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Name
2 days ago

Reply
Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.
Cycle Insurance Quick Quote
Start now
ETA logo
E-bike Insurance Quick Quote
Start now
ETA logo
European Breakdown Cover
Start now
ETA logo
Mobility Scooter Quick Quote
Start now
ETA logo