The above referenced Excel Software Tools are provided, using Metric (MPa or Mks – Kgf/cm²) Units, for determination of seismic loads to Reinforced Concrete (RC) Lateral Force Resisting System (LFRS) elements in Simple Buildings assuming Rigid Diaphragm Analysis (RDA) assumptions, where loads are distributed to resisting elements according to their relative stiffness and location away from the Center of Rotation (COR) of the rigid diaphragm. RC elements may be either Shear Walls or Special Moment Resisting Frame (SMRF) beams and columns.