In this work, we directly correlate ∆φ to the coverage of water estimated from AIMD simulations for a large number of bare flat (111, 100 and 0001) and also stepped (211) transition metal-water interfaces. Like in recent work , we find the binding energy of H 2 O, obtained from static DFT calculations, to be a good descriptor of water coverage and corresponding U PZC on planar surfaces. In addition, we also find OH binding to be a good descriptor, which has a much larger variation across metal surfaces (> 1 eV) than H 2 O (ca.