The consequences that educational underperforming has on both individuals and the society as a whole lead policy makers and planners to focus on how to measure properly the extent of educational poverty. The main aim of this paper is to propose a multidimensional adjusted poverty index (α-MAPI) by considering explicitly not only the individual deprivations, but also the non-deprivation attributes of the poor. It permits to set a precise valuation on school poverty. We apply α-MAPI to the measurement of educational poverty in the OECD countries by using data from PISA 2012 report.