This application is created based on the published look up tables for using the DotDecimal GRID collimator on a Varian TrueBeam machine 6MV beam. Because the GRID collimator aperture pattern is a repeated structure, some of the dose metrics of GRID therapy can be approximated. However, a clinical situation could be very complicated, therefore users' discretion is advised. Neither the creators of the appication nor the authors of the referred paper are responsible for using data generated from this software.