The Iceberg that sank the Titanic slowly started melting after the accident of the Titanic so it will never be fully known the exact measurements of the Iceberg that Sank the Titanic all those years ago.
However it's estimated that the approximate size of the Iceberg that did sink the Titanic was either 50 to 100 feet high and either 200 to 400 feet long.
That's just an estimate and it was supposedly a pretty big Iceberg that the Titanic Crashed into and caused it to sink but thankfully the Iceberg is supposedly no longer around today.
So that makes the waters more safe for ships today.