Ecodesign tools help designers develop products less impactant to the environment, however, its use by project professionals in Brazil is minimum, because most of them do not fit this professional working method. As a result, designers keep developing inefficient products, although they are sensible to the environmental crisis. In this thesis, a tool was developed to support the designer professional in the eco efficient products project, to fit in the Brazilian designer needs. So, a research among designers was done so as to know their necessities of the environmental information, working method and the relation with the Ecodesign tools. Next, some existing tools were chosen, in order to understand their organization and application in the design of the products. Then, environmental information applicable in the project of the product were compiled, as well as organized in strategies and guidelines. With these groups of information, a prototype of this tool was developed. At last, this prototype was validated in real and simulated situations, by designers from a group that, in the research, was identified as the one who mostly needed the tool. As a result, the formatting in guidelines is appropriate, and that designers are able to develop products less impactants to the environment in case they receive appropriate tools to the working method.