The purpose of this study is to develop and apply a measurement tool to diagnose digital maturity(DM) for oil and chemical industry organizations. DM refers to the state of being complete, perfect or ready. This study focused on technology, strategy, human, and culture and each factor consisted of 1∽5 indicators. The DM stage consists of five stages: DT awareness level, beginning level, investment level, strategic utilization level, and optimizer level. As a result of a pilot application to a S company among oil and chemical industry organizations in Ulsan, all factors were found to be in the beginning level. A cluster analysis of the human dimension with the k-means algorithm showed that the second group showed a significant decrease in job adaptability and readiness for change. The DM model of this study is useful for understanding DT from a comprehensive perspective and will help to understand the current (as-is) level and the direction forward. It will be effectively used to provide the present position and future direction to the organization promoting DT and the discussion of limitations is believed to contribute to the expansion of relevant research.