The overall objective of the study is to present the Republic of Korea’s green public procurement (GPP)impact measurement methodology, to compare it to others used by other public authorities internationally and to pilot a macro-economic analysis of the economic and environmental impacts of the Republic of Korea’s GPP policy in order to improve the approaches used by the government to estimate GPP impacts and benefits. Also, it provides guidance to governments reforming their GPP policies and measurement approaches. The results and conclusions of this study help improve our understanding of how sustainable public procurement can create job, income and climate opportunities for countries and help practitioners and decision makers to further improve their policy and monitoring frameworks.