Physical properties of grains are necessary for the designing the facility of storage, handling and processing of agricultural products. Physical and mechanical properties of maize grains were determined as a function of moisture content in the range of 10–30 per cent using standard techniques. The average size, sphericity and density ranged from 8.08 to 8.46 mm, 0.654 to 0.717 and 1219 to 886.47 km/m3 as the moisture content increased from 10–30 per cent. With increase in moisture content the size of maize grains increased from 8.08 to 8.46 mm and sphericity from 0.654 to 0.717. The density increased from 634.85 to 650.81 km/m3 respectively.