The article aims to set a method for a complex measurement scale of the functional value of packaging. The Intuitionistic Fuzzy Synthetic Measure (IFSM) was used for this approach, allowing for the inclusion of uncertainty and ambiguity in consumer evaluations. The proposed method consists of three main stages: assessing the dimensions of informational packaging value using a complex measurement scale, transforming the ratings into intuitionistic fuzzy sets, and aggregating the results using the IFSM. This approach enables both a synthetic evaluation and the identification of strengths and weaknesses across individual dimensions. The method was applied in a pilot study in which consumers who regularly purchase buttermilk products evaluated three packaging variants. The results indicated that the protective function of packaging was rated the highest and most consistently, whereas economic and sustainability-related aspects received lower ratings and were associated with greater uncertainty. The study confirms the effectiveness and flexibility of the proposed method in handling subjective and uncertain data, offering valuable insights for packaging designers and market researchers.