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The present work compares three different methodologies reported in the literature for the iron loss prediction in magnetic lamination supplied with PWM waveform. The target is the comparison of these methods from an engineering point of view. In particular, the authors analyze the practical use of the methods, such as the measurement and/or calculation procedure difficulties inherent each methods. The theoretical approach and the use of these methods have been reported in detail and suitable tests have been performed for a correct comparison of the obtained results. The comparison has shown that the methods are similar from the result point of view. As a consequence, from an engineering approach, the three methods can be considered equivalent and the choice of the method to be used can be based only on the technology available in the test laboratory.