In general, we obtained similar trends for Ag/Pt(111) surfaces and Ag/Pd(111) surfaces, but with differences in the absolute values and specific exceptions. Surface energies of the Ag film covered surfaces were generally close to that of the Ag(111) surface, with the exception of the monolayer Ag covered Pt(111) surface, while for the similar Ag/Pd(111) surface it was Ag(111) like. This discrepancy points to specific interactions between the Ag monolayer and Pt(111), which are absent in the other cases. Formation energies were shown to differ significantly when using bulk or slab systems, which mainly reflects the fact that the latter ones include also changes in the surface energy, which can dominate the formation energy. As a result, bulk based formation energies are always positive for Ag/Pt(111) systems, but partly negative for Ag/Pd(111) systems, while slab based formation energies are always negative. Interface energies, reflecting the additional interaction between Ag and the host metal M as compared to the average of the Ag -Ag and M -M interactions, are derived from appropriately structured bulk unit cells, and corrected for contributions arising from the compression of the film layers (compression energy). They were found to be higher for the Ag/Pd(111) than for the Ag/Pt(111) systems, pointing to a stronger driving force for intermixing in the former case, while the latter system tends to phase separation.