What does ～階 mean?
～階 is a Japanese counter meaning “counter for floors” in English. It is written as ～階 in kanji, ～かい in hiragana, and ～kai in romaji. This word is part of JLPT N5 vocabulary.
Example sentences
私の部屋は三階です。
My room is on the third floor.
レストランは何階ですか。
What floor is the restaurant on?