Th is method is developed for the purpose of helping suppliers to the automotive industry present a potential climate footprint of their proposed products to their customers in a quotation stage. The supplier/producer company is responsible for making a complete inventory of all inputs and outputs of the proposed product in accordance with the D ata C o llection T emplate. The method is based on the modelling of a climate footprint for a fictive average product, that can be used to present an estimated potential climate footprint for future product offers. Th e method was developed as integral parts of a climate footprint project coordinated by FKG, representing Swedish automotive component suppliers. The project resulted in this method, including an inventory tool to be used by supplier s to collect data and an average product model and calculator to estimate a potential clim ate footprint of the suppliers products. The inventory data includes information on supplied materials (types and qualities), transportation ( volume , mode, and distance), and energy sources (types and suppliers) used in production during 2021 or 2022 . This data can be used in simulations for future products. Life Cycle Assessment (LCA) consultants utilize the inventory to construct a simplified cradle to gate model in software tools like SimaPro, LCA for Experts (formerly GaBi )), or other LCA modelling software tool . This model, which employs a “simple cut off for recycled input materials and recyclable materials from production (“simple cut off” according to Ekvall et al. 2020 as recommended by EPD International see further chapter 2 and 3 for scope and modelling )), either utilizes certified climate data (e. EPDs) from sub suppliers or, more commonly, relies on general Ecoinvent data for materials and energy. A simplified LCA model for the average product from the previous year is documented and serves as the baseline for the calculation . Subsequently, a calculator is developed that can simulate a climate footprint for production of a new product in the factory based on the production volume and material mix from the previous year. In the calculator, the climate footprint of the 'core' for each main process and subprocess is treated as fixed factors proportional to the weight of the product. The upstream part treats the raw material mix (bill of materials) as a variable that can be adjusted for each product, where each raw material has specific materials) as a variable that can be adjusted for each product, where each raw material has specific climate footprint factorsclimate footprint factors.. Validation of the Validation of the method method toto developdevelop an an averageaverage--productproduct--model and the calculator is carried out by model and the calculator is carried out by a a validation bodyvalidation body.. In this first version of the methodIn this first version of the method, , the validation body is the validation body is RISE. The validation proRISE. The validation programgram builds on builds on review of review of assumed dataassumed data andand confirms the use of reasonabconfirms the use of reasonable and le and sufficient sufficient data for thedata for the simplifiedsimplified LCALCA modelmodel. The validation program. The validation program does not verify does not verify thatthat the bill of materials the bill of materials andand bill of bill of processes processes are sufficient are sufficient to produce to produce the the product/product/component butcomponent but validates the reasonableness of thvalidates the reasonableness of this is datadata..