Arps equations and type curve matching are the two major decline-analysis techniques for reserves estimation. Both techniques extensively depend on a trial-and-error approach to define the decline exponents, particularly, for the case of hyperbolic decline. This paper presents a PC-based decline analysis program developed based on the method released in recent papers. This program can be applied to analyse a wide range of decline types, including the most complicated hyperbolic, decline. It improves the accuracy of the analysis, and it can be conveniently executed from a PC with an Excel spreadsheet.