This has come up a couple of times recently, so I thought I’d summarize the information here.
The distribution of water on Earth in cubic kilometers
(Biological means like your spit and guts and all the juicy parts of worms and tree saps and water in bacteria and stuff.)
What happens if all that glacial ice melts and ends up in the ocean?
Play with this for a while to get an idea. The maximum rise in sea level in that model is probably not the maximum if all the ice melted, but all the ice won’t melt.