The average height of pyramids is somewhere around 100 feet to 200 feet. The biggest in the world today is called Khufu's Pyramid, which is part of the world-famous Egyptian P … yramids. It is popularly known as the Great Pyramid of Giza, which measures 450 high and covers approximately 13 acres of land.nswer by 2599112328U. Because it was built in honor of a pharaoh and he wanted it to be big so he would be remembered. It was also tall so that the deceased pharaoh could reach Ra, the god of the sun in the sky.