The performance of an economy can be measured using different macroeconomic indicators and different analysis methods. In this context, the aim of the study is to measure the economic performance of the G20 countries, which cover approximately 85% of the world’s economy, including Turkey, during the 2008 crisis period. In the study, growth rate, export growth rate, per capita GDP, import growth, exchange rate, inflation, and unemployment rates were determined as performance evaluation criteria. Within the scope of the study, an integrated model consisting of LOPCOW (Logarithmic Percentage Change-driven Objective Weighting) and COCOSO (Combined Compromise Solution) methods was used to evaluate the economic performance of G20 countries. The weighting coefficients of the criteria considered in the LOPCOW method were calculated. The level of importance of the criteria, that is, the criteria that most affect economic performance, were the exchange rate, unemployment rate, and inflation variables. With the COCOSO method, the performance ranking of the G20 countries between the years of 2006 and 2015, which includes the 2008 crisis period, was analyzed. According to the results of the COCOSO method, the best performing countries were the USA, Germany, and Korea, while the worst performing countries were Indonesia, Argentina, and South Africa. In addition, it was determined that there was a decrease in the general situation of the USA and EU countries after the 2008 crisis.