This is a bigger culture shock than the metric vs imperial system to me.

The older buildings in Hong Kong often need to clarify this to avoid mix ups. Back in the day it's not uncommon to see signs advertising a business on the 3rd floor of a building, for example, to have 3 樓 2字 (3rd floor, number 2) to tell people they're on the 3rd floor but you need the press the 2 button in the lift. Also some (most? all?) skip the 4th floor for bad luck.