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This paper presents a methodology for sizing swirl injectors that is relevant to liquid rocket engine application, as well as, analyses the results of the experiments executed to investigate the validity of the proposed model. On the first part of this paper, a set of equations used to define the injector dimensions is presented. Most of the equations are well know from the literature, however, they had to be adjusted to incorporate a deviation from the traditional approach, which is the separation of the inlet orifice discharge coefficient calculations from the exit orifice discharge coefficient. On the second part, actual data, collected with the aid of test specimens designed in accordance with the methodology herein described, was compared with values prescribed by the theoretical model. Actual and forecasted values were found to be aligned.