〜個: Small Objects | Japanese Grammar

個（こ）is the workhorse of Japanese object-counting: a small, compact, three-dimensional thing — an apple, an egg, a stone, a ball, a piece of chocolate — is counted with 個. It is one of the first counters worth mastering because it is enormously versatile: when you genuinely don't know the "correct" specialised counter for some small solid object, 個 is very often right and almost never sounds absurd. It also has a small phonological catch that trips up nearly every English speaker, so this page walks you through it slowly.

What 個 counts

Think of 個 as the counter for a discrete lump — something you could pick up and turn over in your hand. It has no length worth mentioning (that would be 〜本) and no meaningful flatness (that would be 〜枚). It is just a compact object with three dimensions of roughly the same order.

Fruit and vegetables: りんご (apple), トマト (tomato), たまねぎ (onion)
Eggs: 卵（たまご）
Small round things: ボール (ball), 石（いし, stone), ビー玉（だま, marble）
Small manufactured items: ボタン (button), 電池（でんち, battery), 消しゴム (eraser)
Sweets and snacks: チョコ (chocolate), あめ (candy), おにぎり (rice ball)

りんごを三個ください。

ringo o san-ko kudasai

Three apples, please.

このチョコ、一個食べてもいい？

kono choko, ikko tabete mo ii?

Can I have one of these chocolates? (informal)

The readings — and the geminate catch

個 is a Sino counter, so it attaches to the Sino numbers (いち, に, さん…). The catch is that its consonant k is one of the sounds that geminates after 1, 6, 8, and 10 — the number fuses into a small っ and the k doubles. This is the single most common 個 mistake: an English speaker reads 一個 letter-by-letter as ichi-ko when it is actually いっこ ikko.

Number	Reading	Note
一個	いっこ (ikko)	gemination: ichi → i + kk
二個	にこ (ni-ko)	regular
三個	さんこ (san-ko)	regular — k does not voice after ん
四個	よんこ (yon-ko)	regular (四 = yon)
五個	ごこ (go-ko)	regular
六個	ろっこ (rokko)	gemination
七個	ななこ (nana-ko)	regular (七 = nana)
八個	はっこ (hakko)	gemination: hachi → ha + kk
九個	きゅうこ (kyū-ko)	regular
十個	じゅっこ (jukko)	gemination (じっこ jikko is the older reading)
何個	なんこ (nan-ko)	"how many?"

Two things to lock in. First, only 1, 6, 8, and 10 change — they geminate. Second, unlike 本 or 匹, 個 has no voicing after ん: 三個 stays a clean sanko (not sango), because the k of 個 is a velar and velars don't soften after ん in the counter system. So 個 is simpler than the h-counters: one force (gemination), applied to four numbers.

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The geminate quartet — いっこ, ろっこ, はっこ, じゅっこ — is worth drilling as a little chant. These four (1, 6, 8, 10) are exactly the numbers that geminate across the whole counter system, so the effort transfers directly to 本, 匹, 冊, 回, 階 and the rest. See Counter Sound Changes.

卵が冷蔵庫に六個あるよ。

tamago ga reizōko ni rokko aru yo

There are six eggs in the fridge.

石けんはまだ八個残っています。

sekken wa mada hakko nokotte imasu

There are still eight bars of soap left.

トマトを十個も使うレシピなの？

tomato o jukko mo tsukau reshipi na no?

The recipe uses ten whole tomatoes?

全部で何個ありますか。

zenbu de nan-ko arimasu ka

How many are there in total?

個 and つ: two halves of one toolkit

English has no obligatory counter at all — you just say "three apples." Japanese makes you choose a counter, and for generic small objects you actually have two to choose between: 個 and the native counter 〜つ (ひとつ, ふたつ, みっつ…). They overlap heavily, and beginners find it maddening that both seem to mean "generic thing."

The clean way to split them is by number system and range:

つ uses the native numbers and runs 1 through 9 only (ひとつ … ここのつ), then stops. There is no tootsu for regular counting past nine.
個 uses the Sino numbers and has no ceiling — 十個, 二十個, 百個 all work.

So a very practical strategy is: つ up to nine, 個 from ten onward. Together they give you a complete generic-counting toolkit with no gaps. Under ten the two are largely interchangeable — りんごを三つ and りんごを三個 are both natural — though つ leans a touch softer and more everyday, while 個 sounds a shade more precise or "shop-counter."

みかんを三つと、りんごを三個買った。

mikan o mittsu to, ringo o san-ko katta

I bought three mandarins and three apples.

この飴、全部で二十個入っているらしい。

kono ame, zenbu de ni-jukko haitte iru rashii

Apparently there are twenty candies in this bag altogether.

That second sentence is exactly where 個 earns its keep: 二十個 is normal, whereas つ cannot count to twenty at all.

The kanji, and why it means "individual"

個 on its own carries the sense of an individual, discrete unit. You already meet it in 個人（こじん, "an individual person"), 個々（ここ, "each and every one"), and 個性（こせい, "individuality"). Seeing that thread helps the counter stick: 個 is the classifier that says "counted one discrete item at a time." (informal note: in very casual speech people sometimes even count non-physical "items" with 個 — 問題を一個ずつ, "the problems one at a time" — extending its discrete-unit feel.)

質問を一個いいですか。

shitsumon o ikko ii desu ka

Can I ask you one quick question? (casual)

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In relaxed (informal) speech, native speakers often reach for 個 as a catch-all even where a more specialised counter technically applies — an onigiri "should" arguably be counted various ways, but おにぎり二個 is what people actually say. This tolerant, all-purpose quality is exactly why 個 is the counter to fall back on when you're stuck: it rarely sounds wrong for a small solid thing.

Common mistakes

❌ 一個を「いちこ」と読む

Incorrect — 一 geminates before 個: it is いっこ ikko, not ichi-ko.

✅ 一個＝いっこ

ikko

one (small object)

Reading 一個 as ichi-ko is the number-one 個 error for English speakers, because nothing in the spelled-out kanji warns you the sound fuses. The same trap hides in 六個 rokko, 八個 hakko, and 十個 jukko.

❌ 六個を「ろくこ」と読む

Incorrect — 六 geminates: it is ろっこ rokko.

✅ 六個＝ろっこ

rokko

six (small objects)

❌ 三個を「さんご」と読む

Incorrect — 個 does not voice after ん; it stays さんこ sanko.

✅ 三個＝さんこ

san-ko

three (small objects)

This is the mirror error: learners who have met 三本 sanbon and 三匹 sanbiki assume 個 voices too. It doesn't — velars resist voicing, so 三個 is a plain sanko.

❌ 人が三個いる

Incorrect — people are never counted with 個; use 人 (三人).

✅ 人が三人いる

hito ga san-nin iru

There are three people.

❌ 紙を三個ください

Incorrect — paper is flat, so it takes 枚 (三枚), not 個.

✅ 紙を三枚ください

kami o san-mai kudasai

Three sheets of paper, please.

The last two mark 個's real boundaries: it is for compact objects, not people (→ 人) and not flat things (→ 枚). Within its lane, though, 個 is your safest all-purpose choice — when in doubt about a small solid thing, reach for 個.

Key takeaways

個（こ）counts small, compact, three-dimensional objects: fruit, eggs, balls, buttons, sweets.
It geminates after 1, 6, 8, 10: いっこ, ろっこ, はっこ, じゅっこ. It does not voice after ん — 三個 is sanko.
つ counts 1–9, 個 counts from 10 up — learn them as a pair for a gap-free generic-counting toolkit.
個 is not for people (→ 人) or flat things (→ 枚), but it is the best fallback for any other small solid object.

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