The research was conducted on pepper cress seeds with initial humidity of 13%. The seeds were subjected to hulling with a disk hulling machine in which hulling was achieved as a result of the seeds being hit with spinning working elements. The obtained mixture of morphological parts of the seeds was separated with the use of a sieve and a PETKUS K-293 pneumatic separator. For the purpose of the analysis of geometric features, unbroken seeds and cotyledons, without visible damage, were chosen. Mathematical formulas were employed to calculate surface area and volume for the seeds and cotyledons. Using Grochowicz’s, Mohsenin’s and Donev’s formulas, seed and cotyledon shape coefficients were also calculated. The conducted measurements and calculations indicate that the average length of pepper cress seeds is 29% larger than the average length of cotyledons, the average width of seeds is 40% larger than the average width of cotyledons, and the average thickness of seeds is 51% larger than the average thickness of cotyledons. The average surface area of the hulled seeds calculated with mathematical formulas was 11.02 mm² and was 61% larger than the calculated average surface area of the cotyledons. The average seed volume was 2.36 mm³ and was 79% larger than the average volume calculated for the cotyledons.