What percent of our icecaps are on land vs floating on top of water?

Answer 1

I'll just add to Jeff D's answer by stating that in Antarctica, certain parts of the ice of continent are floating (the ice shelves). They make up about 44 percent of the coastline of Antarctica.

And to make a further clarification about ice caps...ice caps are dome-shaped masses of ice of < 50K sq. km. Ice sheets are >50K sq km. Ice caps and ice sheets exist in Canada, Greenland, and Antarctica. Sea ice is water from the sea that freezes. Sea ice is not the same thing as icebergs. The term "polar ice cap" can include ice caps, ice sheets, and sea ice, although technically, it is only the sea ice portion.

Answer 2

By surface area it's probably about 50/50. Most of the northern icecap is over water and most of the southern icecap is over land (Antarctica). By mass or volume, however, 90% of the icecaps are over land since icecaps get much thicker on land (the average thickness of the ice in Antarctica, for example, is over a mile).