This document discusses the parametric investigation of the effect on base shear of multistoried reinforced concrete frames. It presents the formulation used to estimate base shear values for bare and infilled frames using free vibration analysis in SAP2000 and pseudostatic analysis from Indian code IS 1893. Sample calculations are shown for a four bay, five story frame to determine seismic weight, natural period, and design base shear. Results from the analysis of single bay frames from one to ten stories are presented in a table and figure, showing that base shear generally increases with additional stories but is higher for infilled frames compared to bare frames.