The polarization capacities of Pt, Ni, Cr, Fe, Ta, Al, Cu, and Pb in were evaluated from charging and decay curves obtained by imposing a 2 cps signal on a cell containing one of these metals and a large nonpolarizable electrode. These values are compared to surface areas for the metals determined by Kr adsorption at 78°K in a very small volume adsorption apparatus. For some of the metals the electrochemical method is suitable for routine surface measurements. The use of the parallel procedures provided some additional insight into electrical double layer phenomena at solid electrodes.