In France, the floors are numbered differently, so that the Noble Floor, which is the 2ème étage, is what we would call the 3rd floor in the US. For the ground floor, which the Americans call floor 1, the French have a separate term: rez-de-chaussée.
1er Étage is the floor above the ground floor (or the 2nd Floor)
Lower Ground Floor (Rez-de-Chaussee)
Ground Floor – Mezzanine above the ground floor (Entresol)
1st Floor – 2nd Floor (1er Etage)
2nd Floor – 3rd Floor (2me Etage)
In France, there are two distinct names for storeys in buildings which have two “ground floors” at different levels (on two opposite faces, usually). The lower one is called rez-de-chaussée (lit. “adjacent to the road”), the upper one is rez-de-jardin (lit. “adjacent to the garden”). The same differentiation is used as well in some buildings in Croatia. The lower level is called razizemlje (abbr. RA), and the upper prizemlje (PR). If there’s only one ground floor, it’s called prizemlje. The latter usage is standard for smaller buildings, such as single-family homes.