In this work a simple method is developed to evaluate the design parameters of a horizontal-axis wind turbine (HAWT). The method applies the available data of an axial fan to a HAWT for the same arc profile blade in both machines. The method is illustrated by a numerical example with a complete design procedure in which the pitch angle and the chord of the blade are calculated. These calculated results agree with the measured data of a commercial HAWT blade. Copyright (c) 2006 John Wiley & Sons, Ltd.