As quantum computing evolves, the need for quantum software measurement techniques has increased. Functional Size Measurement (FSM) has been adopted to measure quantum Software in three different approaches based on COSMIC ISO 19761. We examine the proposed approaches by analyzing the measurement results of their application on Shor’s and Grover’s algorithms. A comparative analysis reveals the strengths and limitations of each approach, emphasizing the need for continued refinement. The insights gained from this study are critical for developing a more unified approach for quantum software and pave the way to a standardized approach.