An easy to use program is being developed to calculate diffusion coefficients using the free-volume theory. The program is being developed using Microsoft® Visual C which provides for creating input and output data forms and user activated screen buttons. The current version allows the user to input all parameters of the free-volume model and calculate diffusion coefficients over ranges of temperature and weight fraction. The results are presented in tabular and graphical form. Future versions will provide for the input of diffusion data which will then be used to regress selected parameters in the model.