Measuring software complexity is one of the major challenges faced by the researchers. Complexity is a major driver of the cost, reliability, and functionality of software systems. To control complexity, one must be able to measure it. In this paper, we proposed a method for measuring software complexity at testing phase. We employ the fuzzy repertory table technique to acquire the necessary domain knowledge of testers from which the software complexity is measured. The technique proposed here measures both absolute and relative complexity. Here, we measured absolute complexity for a product 'Image Processing Tool' and the results are analyzed.