In this paper, various size distributions of selected millets (kodo & kutki) were investigated at a moisture content of 12.23% (dry basis). In order to present a quick and an accurate method for measuring the dimensions of small size grain using flatbed scanning (FBS) and image analysis (IA) data was compared with the one measured experimentally. Millet grains were distributed separately on the scanner glass, in order to avoid contact between grains and covered with a white sheet of paper. Analysis by this method takes about 5 min for hundred grains compared to about 30 min for manual analysis using by digital caliper. The average length and width obtained by image analysis and caliper methods were 3.25 and 2.54 mm, 2.74 and 2.60 mm for kodo and kutki millet, respectively. The average eccentricity, equivalent diameter, roundness, perimeter and area evaluated by image analysis were, 0.55 and 0.68, 2.87 and 2.05 mm, 0.78 and 0.66, 9.48 and 6.82 mm and 6.45 and 3.29 mm2 for kodo and kutki millet, respectively. However, the average geometric mean diameter, arithmetic mean diameter, equivalent diameter, square mean diameter, sphericity, flakiness ratio, elongation ratio, aspect ratio, shape factor, projected area, surface area and volume calculated theoretically based on caliper data.