Draw an iceberg and see how it floats
Source: Iceberger
I love little tools that do one thing and do them well. Iceberger is one of those sites. When you visit the page, there is a canvas on which you can draw an iceberg. Once you are done, the site will approximate how the iceberg would actually float.
It’s a great way to visualize how much of an iceberg floats under water, along with how the shape and distribution of ice affects how it floats.