The issue of food security occupies a basic pillar in the Egyptian economy, due to its close connection with the process of economic development on the one hand and political and social stability on the other hand, which amounts to about 17.1 million tons, representing 41.4% of the consumed quantity, it represents a threat to Egyptian food security due to external threats that may impede the flow of grain imports to Egypt. Hence, the research aimed to study the dimensions of the food gap from grain crops and its direct relationship with Egyptian food security and its external dimensions. In order to study the food gap dimensions of grains, the research will address the identification of food production and consumption in Egypt and the sources of food demand and supply for the main food grains group during the period (2000-2019) and estimating the size of the food gap and the self-sufficiency ratio of grains. It was found that the period of adequacy of production for consumption of grains decreases continuously, It was also found that the strategic stock of cereals, amounting to about 1.6 million tons, is not sufficient for local consumption for a month, and it is necessary to increase it to suffice for at least six months, according to food security considerations. The data indicated that the food security coefficient during the study period was estimated at about 0.01, and therefore it becomes necessary to increase its value to reach 0.5 in order to create a strategic accumulation of grains in Egypt.