How do we calculate potentially avoided CO₂e?
We show an indicative estimate based on the weight of the reused part and on life-cycle assessment studies from the automotive sector.
Formula
part weight (kg) × 5 kg CO₂e/kg
The 5 kg CO₂e/kg factor is used as a generic manufacturing factor for a combustion vehicle. The study itself warns that intensity depends on materials, composition and manufacturing processes.
What it means
The indicator estimates the emissions associated with manufacturing equivalent weight of a new vehicle that are potentially avoided by reusing an existing part.
What it does not mean
It is not the complete carbon footprint of the purchase and does not include all logistics and operational processes.
Why we use an average
The composition of each spare part varies. V1 uses a generic, transparent and simple factor; evolution towards family-specific factors is planned.
Frequently asked questions
Is it calculated using the real weight of the part?
Yes. The value is calculated from the recorded weight of the part. Potentially avoided CO₂e (kg) = part weight (kg) × 5 kg CO₂e/kg.
Does it include transport and packaging?
No. It is an indicative estimate of potentially avoided new manufacturing, not the exact carbon footprint of the operation. V1 does not include dismantling, cleaning, storage, packaging, transport or end-of-life treatment.
Why is the ≈ symbol shown?
Because this is an indicative estimate, not an exact measurement of the purchase. The ≈ symbol and the expression “potentially avoided” show that the figure is approximate: it reflects the potential benefit of reusing the part, based on a sector average, not a precise value.
Where does the 5 kg CO₂e/kg factor come from?
The 5 kg CO₂e/kg factor is used as a generic manufacturing factor for a combustion vehicle. Hawkins et al. estimate a cradle-to-gate intensity of 5 kg CO₂e per kg of automobile for ICEV production, within a range of 4 to 6.5 kg CO₂e/kg. The study itself warns that intensity depends on materials, composition and manufacturing processes.
Will the methodology be updated in the future?
Yes. Today we use a generic factor for all parts. In the future we may apply factors by part type or material composition. If the calculation or the sources change, we will update this page and show the date.
Sources used
Main scientific source
Hawkins, T. R., Singh, B., Majeau-Bettez, G., & Strømman, A. H. (2013). Comparative Environmental Life Cycle Assessment of Conventional and Electric Vehicles. Journal of Industrial Ecology, 17(1), 53-64. DOI: 10.1111/j.1530-9290.2012.00532.x
The article reports a cradle-to-gate intensity of 5 kg CO₂e/kg of vehicle for producing a conventional car, within a range of 4 to 6.5 kg CO₂e/kg.
View DOIComplementary reference
Smit, R., & Kennedy, D. W. (2022). Greenhouse Gas Emissions Performance of Electric and Fossil-Fueled Passenger Vehicles with Uncertainty Estimates Using a Probabilistic Life-Cycle Assessment. Sustainability, 14(6), 3444. DOI: 10.3390/su14063444
View DOIEnvironmental communication framework
Directive (EU) 2024/825 on empowering consumers for the green transition through better protection against unfair practices and better information.
Official text on EUR-Lex
v1 · 23 September 2026
