A computer program to estimate the weights and volumes of space borne power systems has been written. The program runs on a Zenith Z-100 microcomputer. The weight and volume of the system is calculated based on component data stored in the form of databases. An executive program which provides maximum flexibility to the user in terms of specifying the desired characteristics of the target system has been written. Constraints on the weight and volume of the system may also be specified. Some of the characteristics that may be specified are power requirement, orbit, duty cycles, etc. A complete User's Manual which describes the working methods to create new databases and enter new data, and includes error handling techniques has been generated. The result is an interactive, menu driven, user friendly software package to estimate the parameters of a space borne power system. / M.S.