Knowledge is a key to creating a sustainable competitive advantage. Measuring knowledge of an organization as a unit allows for, in addition to other things, benchmarking it against other organizations as well as comparing the development within the organization in the course of time. Additionally, measuring the knowledge of individuals and groups helps identify key workers and can also be used when recruiting a new work force, while evaluating employees' work performances, or to check the course of the adaptation of a new employee. Even though the field of measuring knowledge belongs, in comparison with other topics, among the lesser-developed fields in the management of knowledge, a number of approaches that can be used to measure knowledge have been introduced. The aim of this study is to present an overview of methods which can be applied when measuring the knowledge of organizations, groups or individuals and thus provide a practical list of methods which feature in literature mostly for practitioners and novices in this field. The study is based on a content-analysis of literature.