This document presents a method for calculating the area of brain tumors in CT scan images using morphological operations. The proposed method involves 10 steps: 1) inputting a CT scan image, 2) cropping the image, 3) converting to grayscale, 4) applying morphological gradient filtering, 5) histogram equalization, 6) selecting the region of interest, 7) subtracting and thresholding, 8) morphological closing, and 9) calculating the tumor area. The method is tested on different tumor images and more accurately calculates tumor area compared to radiologists who assume tumor shapes. The algorithm provides automated tumor highlighting and area calculation to assist physicians.