District-determined measures. DDMs. How can you calculate them? The "DDM calculator" is an excel spreadsheet that is set-up to make this an easy task. Just enter your students' names, pre-test, and post-test scores, and your district's cut-off scores, and excel will instantly determine each student's growth score, their growth band, the percentage of students falling in each growth band, and in which growth band the median value falls. This worksheet makes data analysis easy, and visual, and is set-up to allow teachers to input data for up to 30 students in up to 6 sections or subjects.