A digital transformation process as an emerging management practice requires a clear, well-described and detailed toolset, that will be handful and easy to apply in practical everyday tasks in a digital transformation change process. In this research, the essential tool of a digital transformation process created by authors is described. Created by research’s authors as D-Cycle, this tool allows to run a digital transformation of organisation, process, or it’s segment from any transforming object’s digital maturity level. D-Cycle will be useful as a key digital transformation tool in digital transformation programmes and day-to-day digital managers’ activities. This tool is also suitable for creating more complicated digital transformation frameworks, those suit for tasks of large enterprises or massive social institutes. D-Cycle does not focus on any certain industry or social field, hence it’s rather universal for solving digital transformation problems. Its practical concise content allows it to be used almost without any special competencies in digital transformation and makes it ready to be applied widely.