Calculation basis for the CO2 calculator

CO2 emissions car

The CO2 calculator is based on quantity data as provided by the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (hereinafter referred to as BMU). According to the current data of the BMU, a car causes on average

2.32 kg CO2 per litre of petrol; 

per litre of diesel 2.63 kg CO2

Calculation in g/km

We have based the data used for the CO2 calculator on the information provided by the BMU.  

In order to provide transparency in the calculation of the CO2 calculator for motor vehicles, we explain the calculation bases used to calculate the CO2 emission per kilometre driven and display the result:

Petrol: Multiply consumption per 100 kilometres by 23.8. Example: 8 litres/100 km = 8 times 23.8 = 190.4 g CO2/km

Diesel: Multiply consumption per 100 kilometres by 26.5. Example: 5.5 litres/100 km = 5.5 times 26.5 = 145.8 g CO2/km

The CO2 emissions calculator for motor vehicles also shows you the carbon dioxide (CO2) emissions for a distance travelled of your choice.

CO2-Uptake by trees

The values for the possible CO2 absorption of a tree are average values. Depending on various factors, trees absorb CO2 very differently. These include, for example, the tree species, light intensity, latitude, vegetation period (growth period), soil conditions and much more.

As a basis for the calculations of the CO2 uptake of trees, the data of the United Nations Framework for Climate Change Convention (UNFCCC) were used.

While in Central Europe a deciduous tree absorbs an average of 10 kg CO2 per year, this value is many times higher in the tropics, among other things due to the higher light intensity and faster growth of the trees.

In the sub-tropics this value is expected to double: 20 kg CO2 per year per tree.

This means for the calculation:

2 tons of absorbed CO2 = 10 trees in the subtropics (based on the following calculation: 20 kilograms of CO2/year and 10 years of standing time)

This corresponds to 0.2 tons of CO2 per tree for 10 years of growth.

As can be seen on, there are mainly fast growing tree species with a growth period of 10-15 years. Also noble trees with a growth period of 35-40 years, which we have not calculated. We assume that the fast-growing trees store more CO2 than we have calculated.