| No. | Kana | Kanji | Usual writing |
|---|---|---|---|
| -2 | ちかにかい | 地下二階 | 2BF |
| -1 | ちかいっかい | 地下一階 | 1BF |
| 1 | いっかい | 一階 | 1F |
| 2 | にかい | 二階 | 2F |
| 3 | さんがい | 三階 | 3F |
| 4 | よんかい | 四階 | 4F |
| 5 | ごかい | 五階 | 5F |
| 6 | ろっかい | 六階 | 6F |
| 7 | ななかい | 七階 | 7F |
| 8 | はちかい | 八階 | 8F |
| はっかい | |||
| 9 | きゅうかい | 九階 | 9F |
| 10 | じゅっかい | 十階 | 10F |
| 11 | じゅういっかい | 十一階 | 11F |
| 12 | じゅうにかい | 十二階 | 12F |
| 13 | じゅうさんかい | 十三階 | 13F |
| 20 | にじゅっかい | 二十階 | 20F |
| How many | なんかい | 何階 | |
| なんがい |
~階 (kai) Counter
~階 counter is used to count building floors and levels. Usually you won’t encounter the kanji writings in the actual buildings, but just number + F and generally 1F is the ground floor. Basement floors are usually written as number + BF.