There are a lot of different mechanisms and devices in which sliding-friction surfaces could be found. The issues of the service life and its prediction for details with such surfaces have always been of particular importance. The article determines the most suitable wear calculation model that allows considering the set of parameters needed for the slide-friction pair’s calculation. The offered model is based on the application of theories of several branches of sciences. Since the wear process is variable and many-sided it is influenced by very many different parameters, for example, the surface geometry (roughness, waviness, form deviation, etc.), the physical and mechanical conditions of the upper layer, component material, wear regime, wear temperature, etc.