This paper details a new expansion tube parametric analysis code, PITOT. This new code aims to provide a user-friendly, flexible, and specialised expansion tube analysis tool, which can be used to rapidly design new expansion tube flow conditions, and also rapidly characterise actual experimental test flows. The paper begins by providing an overview of expansion tube wind tunnel facilities, and details The University of Queensland's X2 and X3 facilities. It then describes the new PITOT code, including its functionality, intended application, and underlying theoretical framework. Some benefits of this code compared to previous analytical routines are its user-friendly interface, and its robust implementation of equilibrium gas principles, including its library of different test gases. The paper presents preliminary results comparing PITOT predictions with CFD and experimental results, generally showing good agreement, and demonstrating the value of having an improved, short run time, flow condition design tool.