You may know that water covers nearly 75% of the Earth’s surface, are much of the water is contained within the world’s oceans. There is only a small portion of freshwater sources on Earth: lakes and rivers take a small part of that, but most of the freshwater is either underground or locked away, frozen in glaciers and ice caps.

Of all the water on Earth, over 97.5% is contained as salt water, leaving just 2.5% as fresh water.

About 97% of the earth's water is salt water, most of this in the oceans. That being said there is also a lot of water on Earth, and since it cycles, we just have to be careful not to pollute the valuable fresh water we have. Also, a good amount of the fresh water on Earth (about 70%) is frozen in glaciers and ice caps.

Oceans (which are the biggest bodies of salt water on our planet) cover around 70% of the surface of earth.

The result from a quick Google search: 97.2% of the Earth's water is in the oceans, which is all salt water. About 2% is glaciers (fresh), 0.6% is groundwater (also fresh), and the rest (mainly fresh) adds up to about 0.02%.

Now, WARNING: there is a LOT of water locked away in rocks in the Earth's mantle. I don't know how much there is. It wouldn't really either be salt or fresh, though (it comes out as steam when volcanoes erupt).