The counter 1階 is used for counting: 1st floor (building levels) (Category: 階 (kai/gai) - Floors of a building, JLPT N4). 一 (ichi) contracts with 階 (kai) to form 'ikkai' (double consonant sokuon sound change).
Context Example
私の部屋は1階にあります。
Watashi no heya wa ikkai ni arimasu.
My room is on the first floor.
Which counter represents "1st floor (building levels)"?
Correct! 🎉
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