This document describes an application program developed to measure the energy spread of particles in the Booster synchrotron at injection. The program analyzes raw data from a wall current monitor that detects notches in the beam as it revolves. It identifies the minimum of each notch, calculates the relative intensity over revolutions to see how the notch evolves, and determines when high- and low-momentum particles have a "grazing touch" to find the energy spread based on revolution time measurements. Preliminary results from the program look promising for optimizing the beam, but more data is still needed to draw definitive conclusions about the energy spread.