I like ground being 0. That way you have a continuous number line from basement to the top:

-2 -1 0 1 2 3 4 5

So the "second story" is "floor 1"? That seems odd.

Speaking of that, you could have also had "stories" vs "storeys" in this.

I like ground floor as well....1st floor is ground floor.

Americans are not consistent about this either

In Europe a lot of countries name the "ground level" floor something because historically "zero" was a bad number, so they instead called it something else because the logic was to start at 0.

It's kinda like how some buildings in the USA exclude the 13th floor.

Little fun fact btw - the whole foods database used to exclude Friday the 13th. Found this out when I worked there and was trying to show my receipt for something I got, and when the manager looked, we couldn't find it. Then another coworker came in and brought up something they brought up the day before and it couldn't be found either.

After a bit, we found it Thursday 12th, but then when scrolling saw it skipped Friday 13th and instead went straight to Saturday 14th.

German counts floors like the british with the lowest being the ground floor (Erdgeschoss) and then counting the Upstairs floors.

I'd be curious how that is in other languages.

International people in the comments:
Tell me how you count floors

As some one outside both countries 1 2 3 4 5 is where it's at. The second floor being the first makes no sense.

If this was a taller building, the terms would match up once the Americans skip referencing a 13th floor