The major aim of this paper is to ascertain the level, differential, and prediction of gender equality in Nigeria by 2015. Knowledge accumulation and application, especially for women, have become major factors in economic development and are increasingly at the core of a country’s competitive advantage in the global economy. Secondary data from Nigeria Demographic and Health Survey (NDHS), Nigeria Demographic and Education Survey (NDES), Sentinel survey and National Population Commission (NPC) data were used. The result showed that over 71 percent of women had no education while 43 percent of men had no education. Furthermore, there is disparity between women and men education according to household economic status as in the poorest households, 40 percent of men are literate compared to 13 percent of women. Also, the population projection from 2009 to 2015 with 2008 as the base year was carried out. The result showed that Nigerian’s population by sex is growing exponentially at the rate of 3.04%. This increase will further hamper the realization of the third millennium development goal which is gender equality by 2015.