In common US usage, the heights of tall things are sometimes converted to a "number of stories". The thinking is that people can better compare heights to similar tall buildings that they might have seen.
The US conversion is usually: $$\text{Number of stories} = \text{Round}\Big(\frac{\text{height in feet}}{10}\Big)$$
I assume that something similar is used in metric countries like: $$\text{Number of storeys} = \text{Round}\Big(\frac{\text{height in meters}}{3}\Big)$$
I am assuming that like most things that are common usage, this conversion is not correct in practice.
What is a more accurate height of a building story?
How does this cause confusion when comparing the height of a building in "stories" to the actually number of stories?