The thickness of a palladium coating on copper (or another substrate) is measured chronopotentiometrically by passing a cathodic current through a predetermined area of the coating in contact with an electrolytic solution and measuring the potential as a function of time. Protons from the electrolytic solution are electrochemically reduced to palladium hydride at cathodic potentials less negative than required for evolution of hydrogen gas. As formation of the PdH0.58 beta-phase throughout the Pd coating is completed, the cathodic potential increases rapidly to a cathodic potential plateau corresponding to evolution of hydrogen gas on the PdH0.58 surface. This voltage step in the cathodic potential provides an end point time for the measurement. The absolute thickness of the Pd coating is calculated from the integrated cathodic charge passed up to the end point time. (C) 2014 The Electrochemical Society. All rights reserved.