There are a number of shape factors available in the literature to describe the deviation of non-spherical particles to spheres. Dynamic shape factor (chi) is the most suitable parameter for flow applications as it takes into account the dynamic properties of the non-spherical particles. In this study, dynamic shape factors for spheres, cubes, cuboids and cylinders settling in the transition regime (2 < Re-t < 500) are determined experimentally. Wall effects on the terminal settling velocity are accounted based on literature models. chi for spheres and cubes are found to be constant with particle size when conventional wall effect models are followed. chi for cuboids and cylinders, on the other hand, are found to be a function of the particle characteristic length-to-column diameter ratio (I/D) and the particle aspect ratio (I/d). An empiricalcorrelation is developed to estimate chi for both cuboids and cylinders settling in the intermediate regime. The correlation can provide a low average error of 3% for all the cuboids and cylinders used in this study. (C) 2012 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.