about how much percent of the earth is covered with water
About 66% or 2/3 of the Earth is covered by water. The amount of Earth covered by water is exactly 71.13%. 70.78% of the Earth is covered in water. Land covers 29.22 percent of the Earth's surface. This is about 57.5 million square miles (149 x 106 square kilometers). Water covers the other 70.78 percent of the Earth's surface. This is about 139.4 million square miles (361 x 106 square kilometers).