This study analyzes the benefits and costs of the monetary integration convergence conditions and unification of 11 Asian countries to verify the possibility of financial integration. The paper features a consideration of the degree of international financial integration by adding financial structure and household financial variables to the existing OCA variables as measures to eliminate risk. Furthermore, the study ensures net benefit by obtaining the standard value from each convergence value to compare the convergence degrees among the nations. This study’s achievements are threefold. Firstly, the monetary integration convergence conditions and the benefits as well as the costs are varied using different variables and approaches. Secondly, it is confirmed that the analysis of domestic financial structure including household finances is important when discussing monetary integration. Thirdly, the study ascertains that international financial integration functions as an important variable for monetary integration since net benefits appear in many countries.