Surface Evolver – Fluid Interface Tool (SE-FIT®) software is a Windows application that consists of a graphical user interface front end with the Surface Evolver (SE) serving as the computational engine. SE is a unique and powerful tool for computing the shape and stability of equilibrium fluid interfaces. SE-FIT® is developed to improve accessibility to command line based SE and to expand the overall capability of SE so that important fluid interface information can be computed in a timelier, more routine, and more frequent manner. Improvement in design efficiency is at least an order of magnitude greater than when using existing Computational Fluid Dynamics programs. The SE-FIT® program is currently developed by the Capillary Fluidics Lab at Portland State University.