Foreign direct investment (FDI) is one of the instruments that plays an important role in the economic development and economic growth of countries. Apart from the physical capital and competitiveness they add to the countries, they are structures that contain many advantages such as employment, technology, management and the concept of supervision. They include a commitment to a long-term business effort in a foreign country. Therefore, where they prefer as a location depends on many criteria. This study focuses on measuring the performance of selected G-20 countries in terms of inward FDI flows. In this context, the factors affecting inward FDI flows in countries were compiled using literature and investment reports, and the collected data were evaluated by applying the COPRAS (Complex Proportional Assessment) method. The empirical findings show that the countries with the best performance in foreign direct investments are China, USA and India, respectively.