The map of the relative binding strength of copper in topsoils (0-30 cm) gives an overview of the sorption of this heavy metal in the soils of Germany. A high binding strength of copper can reduce the harmful impact on the environment by a decreased mobility. The basis for calculation of the binding strength was the soil map 1:1,000,000 (BÜK1000) as well as linking rules and tabular values of copper binding from Hennings et al. (2000). The binding strength of copper depends on the pH, the content of organic matter and the soil texture (proxy for the content of clay minerals and sesquioxides) in this evaluation. The used pH was the target pH value of the soils, which was derived from tabular values according to land use by using the data of the BUEK1000.