～階

§ What does ～階 (kai) mean and when do people use it?

Alright, let's get straight to it. When you're talking about floors in a building in Japanese, you're going to use ～階 (kai). It's a counter, which means it attaches to a number to specify 'how many' floors. Think of it like saying 'one *floor*' or 'two *floors*' in English. But in Japanese, these counters are essential, and you can't just slap a number in front of the noun like you often do in English. So, you'll hear things like 一階 (ikkai) for the first floor, 二階 (nikai) for the second floor, and so on.

You'll use ～階 whenever you need to specify which floor something is on, or how many floors a building has. For example, if you're asking someone which floor the restroom is on, or telling someone your office is on the third floor, this is the counter you need. It's practical and comes up a lot in daily conversation, especially if you're navigating buildings like department stores, train stations, or hotels.

DEFINITION

Counter for floors of a building.

Let's look at some examples to make this concrete.

As you can see, it's pretty straightforward. You attach the counter to the number. But here's where it gets a little tricky: pronunciation. Japanese counters often have sound changes depending on the number they're attached to. For ～階, these changes are particularly important because they happen quite frequently.

Let's go through the common numbers with ～階:

• 一階 (ikkai): First floor (Notice the small 'っ' or 'tsu' which indicates a glottal stop or a 'double consonant' sound. This is a common sound change.)
• 二階 (nikai): Second floor
• 三階 (sangai): Third floor (Here, 'kai' changes to 'gai'.)
• 四階 (yonkai): Fourth floor
• 五階 (gokai): Fifth floor
• 六階 (rokkai): Sixth floor (Another 'っ' sound change.)
• 七階 (nanakai or shichikai): Seventh floor (Both are used, 'nanakai' is often preferred for clarity.)
• 八階 (hakkai): Eighth floor (Another 'っ' sound change.)
• 九階 (kyuukai): Ninth floor
• 十階 (jukkai or jikkai): Tenth floor (Both are common.)
• 何階 (nankai): Which floor? (The 'n' changes to 'm' sometimes in speech, but 'nankai' is standard.)

You need to memorize these sound changes. There's no real shortcut here, just practice. Think of it like irregular verbs in English – you just have to learn them. The more you hear and use them, the more natural they'll become. Don't stress too much about getting it perfect on your first try, but be aware that these changes exist.

So, when do people typically use this? Any time you're in a building and need to refer to a floor. This could be in a store:

Or in a hotel:

Even if you're talking about apartments:

The key takeaway here is that ～階 is a crucial counter for daily life in Japan. Master the numbers and their associated sound changes, and you'll be able to navigate buildings and discuss locations with much more confidence. It's a foundational piece of vocabulary that you'll use constantly, so take the time to get it right.

§ Understanding 「～階」

The Japanese word 「～階」 (かい / gai) is a counter used specifically for counting the floors of a building. It's a really practical word to know, whether you're looking for a specific shop in a department store or trying to tell someone which floor you live on. While the kanji is the same, the pronunciation changes depending on the number it's attached to. Don't worry, we'll break it down.

§ Basic Usage: Numbers + 階

To use 「～階」, you simply attach it to the number of the floor you're talking about. For example:

• 1st floor: 一階 (いっかい - ikkai)
• 2nd floor: 二階 (にかい - nikai)
• 3rd floor: 三階 (さんがい - sangai)
• 4th floor: 四階 (よんかい - yonkai)
• 5th floor: 五階 (ごかい - gokai)
• 6th floor: 六階 (ろっかい - rokkai)
• 7th floor: 七階 (ななかい - nanakai)
• 8th floor: 八階 (はっかい - hakkai)
• 9th floor: 九階 (きゅうかい - kyuukai)
• 10th floor: 十階 (じゅっかい / じっかい - jukkai / jikkai)

§ Asking "Which Floor?"

To ask "which floor?" you use 「何階」 (なんがい - nangai). The pronunciation also changes here.

Hint

Where is the restroom? (literally: The restroom is which floor?)

When answering, you'll use the number + 「階」 directly:

Hint

The restroom is on the third floor.

§ Common Phrases and Particles

You'll often hear 「～階」 used with particles like 「に」 (ni) to indicate location or 「から」 (kara) and 「まで」 (made) for ranges.

§ Indicating Location (～階に)

Use 「～階に」 to state where something is located.

Hint

The bookstore is on the second floor.

Hint

I live on the fourth floor.

§ Moving Between Floors (～階から～階まで)

When talking about going from one floor to another, you'll use 「～階から～階まで」.

Hint

The elevator goes from the first floor to the fifth floor.

§ Cultural Note: Ground Floor

In Japan, what English speakers call the "ground floor" is typically referred to as 「一階」 (いっかい - ikkai), the first floor. There isn't a separate word for "ground floor" as there is in some other languages. Keep this in mind when navigating buildings!