There are voids found in the pellet structure, which lead to a porous space formation. The pellet voids might be represented by confined volumes, channels or capillaries. Optionally, the volume of capillaries can be evaluated by means of impregnating the pellets with water. The objective of present paper is to evaluate the peculiarities of porous space within the fired pellets employing a model of capillary-porous body. For this purpose, the lab-scale and commercial-scale pellets were presented. According to the data acquired, the samples with higher value of moisture capacity have higher reducibility. This method of evaluation as to fired pellets pores provides the information about effective porosity, which can be used for further forecasting of pellet reducibility.