This chapter describes the measurement of education inequality that Torpey-Saboe has developed: a Gini coefficient for years of schooling. This Gini coefficient is derived using data from Barro and Lee (Journal of Development Economics 2013, pp. 184–198) on educational attainment for various portions of the population and United Nations Educational, Scientific and Cultural Organization (UNESCO) data on the duration of primary and secondary schooling in countries around the world. Using these datasets, Torpey-Saboe calculates the shares of the population that have attained corresponding shares of the total years of education in the country and constructs a Gini coefficient for education inequality. This measure is unique in that it is the only measure of education inequality suitable for looking at changes in the distribution of education over time and for exploring potential causes, rather than consequences, of education inequality.