The presented study is a comprehensive scientific investigation that includes an analysis of existing materials on the topic of financial and economic culture and related concepts (such as financial literacy, economic culture, economic consciousness and attitudes) and a description of an original sociological diagnostics methodology for determining the level of financial and economic culture of any social group. The methodology makes it possible to reduce the final value of the measurement of financial and economic culture to a certain level value (high, medium, or low), which in turn makes it possible to compare and track the dynamics of data based on the preferred socio-demographic data of the group of respondents under investigation. The author identifies deterministic indicators of financial and economic subjectivity that are measured by weights, which is indicative of the objectivity of the obtained results. The methodology was tested as part of a research project (under the guidance of Prof., PhD. A. G. Tyurikova) at the Financial University under the Government of the Russian Federation.