Here's a more complete picture for the case when all ice melts and sea levels rise by 60+ meters: http://www.johnstonsarchive.net/environment/waterworld.html (note: by a "skeptic")

> Today the Earth has 148 million sq. km of land area, of which 16 million sq. km is covered by glaciers. A sea level rise of 66 meters would flood about 13 million sq. km of land outside Antarctica. Without polar ice, Antarctica and Greenland would be ice free, although about half of Antarctica would be under water. Thus, ice-free land would be 128 million sq. km compared to 132 million sq. km today.

I can't check all the calculations, but this result doesn't seem too terrible since we'd likely be able to migrate affected people in time.