The total volume of water on earth is estimated at 1. 386 billion km 3 (333 million cubic miles), with 97. 5% being salt water and 2. 5% being freshwater. Of the freshwater, only 0. 3% is in liquid form on … Earth is an ocean planet.

But how much water is there really? In this illustration, the sphere on the left … Just how big is the ocean? The ocean, which we often break into five large ocean basins, covers 71 percent of the earth's surface and holds over 1. 3 billion cubic km of water.