Abstract: A multipurpose calculator includes a casing having one pair of side slots made at the front on both side walls for pivotally movable connection thereto of a movable cassette block, said movable cassette block being applicable to move within 180.degree., four elongated holes made on the front end wall through the body of the casing for setting therein of a scraper, a fluorescent marker, a flat type screw driver, and a cross type screw driver respectively. The movable cassette block comprises an illuminating apparatus to provide a solar power calculator with sufficient energy for operation. The said casing includes a rectangular recess for setting thereon of a solar calculator, a cutter and a steel tape respectively mounted on both sides for specific application. According to above-described arrangement, a calculator is practical for multipurpose application.