The weight of the Great Pyramid of Giza is estimated to be around 5.9 million tons, with the weight of pyramid stones being between 2.5 and 80 tons each. This colossal structure, built during the reign of Pharaoh Khufu, comprises immense limestone and granite blocks, contributing to its staggering weight. The precision in aligning and stacking these massive stones showcases the engineering marvel of the ancient Egyptians.