半 with a Measure Word (半个) | Chinese (Mandarin) Grammar

半 (bàn) means "half," and the single most useful thing to know about it is that it behaves grammatically like a number. Just as 一 (one) needs a measure word before a noun (一个苹果), so does 半: 半个苹果 (bàn ge píngguǒ) "half an apple," 半瓶水 (bàn píng shuǐ) "half a bottle of water," 半个小时 (bàn ge xiǎoshí) "half an hour." Once you see 半 as "a quantity, namely one-half," the whole grammar falls out of what you already know about the general measure word 个 and its siblings — you just slot 半 into the number position. The one twist is the "one and a half" pattern, where 半 jumps to the other side of the measure word.

半 = half a unit: 半 + Measure Word + Noun

To say "half a(n) _," put 半 in front, exactly where a number would go: 半 + Measure Word + Noun. The measure word is not optional — it's required for the same reason it's required after any number.

我早上只吃了半个包子就出门了。

wǒ zǎoshang zhǐ chī le bàn ge bāozi jiù chūmén le

I only ate half a bun this morning before heading out. (informal) — 半个包子, half a bun.

瓶子里还有半瓶水，你先喝吧。

píngzi li hái yǒu bàn píng shuǐ, nǐ xiān hē ba

There's still half a bottle of water — drink it. (informal) — 半瓶水, half a bottle.

我等了半个小时，他才慢悠悠地来。

wǒ děng le bàn ge xiǎoshí, tā cái mànyōuyōu de lái

I waited half an hour before he came sauntering in. (informal) — 半个小时, half an hour.

再给我半碗饭就够了。

zài gěi wǒ bàn wǎn fàn jiù gòu le

Just half a bowl more of rice is enough for me. (informal) — 半碗饭, half a bowl.

💡

When in doubt, treat 半 exactly like 一. If you'd say 一个苹果, then "half an apple" is 半个苹果 — same slot, same measure word. This single analogy handles almost every 半 phrase you'll ever need.

Time words that are their own measure

A handful of time nouns — 天 (day), 年 (year), 分钟 (minute) — are themselves measure words, so 半 attaches directly with no extra classifier: 半天 (half a day), 半年 (half a year), 半分钟 (half a minute). By contrast, 小时 (hour) is a noun that takes 个, so it's 半个小时. Both patterns are correct; the difference is whether the time word carries its own measure.

这件事我想了半天，也没想明白。

zhè jiàn shì wǒ xiǎng le bàntiān, yě méi xiǎng míngbai

I thought about this for ages and still couldn't figure it out. (informal) — 半天 attaches directly; here it also idiomatically means 'a good while.'

还差半个月就放假了。

hái chà bàn ge yuè jiù fàngjià le

It's only half a month until the holidays. (informal) — 月 takes 个, so 半个月.

One and a half: Number + Measure Word + 半

Here is the twist. For "one and a half," "two and a half," and so on, 半 moves to after the measure word: Number + Measure Word + 半 (+ Noun). The whole units come first, then the leftover half.

Pattern	Example	Meaning
半 + MW + N	半个小时	half an hour
Number + MW + 半 (+ N)	一个半小时	an hour and a half
Number + MW + 半 (+ N)	三个半月	three and a half months
self-measuring time + 半	一天半 / 三年半	a day and a half / three and a half years
clock time	两点半	half past two

这部电影差不多有一个半小时。

zhè bù diànyǐng chàbuduō yǒu yí ge bàn xiǎoshí

This movie is roughly an hour and a half. (informal) — 一个半小时, one whole hour plus a half.

我们在那儿住了三个半月。

wǒmen zài nàr zhù le sān ge bàn yuè

We lived there for three and a half months. (neutral) — 三个半月, three months and a half.

我在国外待了一年半才回来。

wǒ zài guówài dāi le yì nián bàn cái huílái

I was abroad for a year and a half before coming back. (informal) — 年 is self-measuring, so 一年半, half after the whole.

现在是两点半，我们该走了。

xiànzài shì liǎng diǎn bàn, wǒmen gāi zǒu le

It's half past two now — we should get going. (informal) — 两点半, 半 after 点 for the clock.

半 vs 一半 — "half a unit" versus "half of it"

Don't confuse quantifier 半 with the noun 一半 (yíbàn). 半 means "half a(n) [unit]" and needs a measure word and a noun after it. 一半 means "one half / 50% — half of it," a standalone fraction that refers back to a known whole. You eat half an apple (半个苹果), but you eat half of this apple (这个苹果的一半 / 吃了一半).

这个苹果我吃了一半，剩下的给你。

zhè ge píngguǒ wǒ chī le yíbàn, shèngxià de gěi nǐ

I ate half of this apple; the rest is for you. (informal) — 一半 = half of the specific apple.

蛋糕我们一人一半，怎么样？

dàngāo wǒmen yì rén yíbàn, zěnmeyàng?

Let's split the cake, half each — sound good? (informal) — 一半 = a half-portion each.

Common Mistakes

1. Dropping the measure word. 半 is a quantity, so it needs a classifier just like a number does.

❌ 我吃了半苹果。

Incorrect — 半 needs a measure word: 半个苹果.

✅ 我吃了半个苹果。

wǒ chī le bàn ge píngguǒ

I ate half an apple. — 半个, with the measure word.

2. Misplacing 半 in "one and a half." For "an hour and a half," 半 goes after the measure word; 一半个小时 means something else entirely.

❌ 我等了一半个小时。

Incorrect — 一半个 is wrong for '1.5 hours'; it's 一个半小时 (半 after the MW).

✅ 我等了一个半小时。

wǒ děng le yí ge bàn xiǎoshí

I waited an hour and a half. — 一个半小时.

3. Confusing 半 with 一半. For "half of it," use the noun 一半, not the bare quantifier 半.

❌ 苹果我吃了半。

Incorrect — for 'I ate half (of it)' use 一半: 苹果我吃了一半.

✅ 苹果我吃了一半。

píngguǒ wǒ chī le yíbàn

I ate half of the apple. — 一半 = half of the whole.

4. Using 二 instead of 两 with 半. Before a measure word, "two" is 两 — including in "two and a half."

❌ 我们聊了二个半小时。

Incorrect — before a measure word 'two' is 两: 两个半小时.

✅ 我们聊了两个半小时。

wǒmen liáo le liǎng ge bàn xiǎoshí

We chatted for two and a half hours. — 两个半小时.

Key Takeaways

半 behaves like a number, so "half a _" is 半 + Measure Word + Noun: 半个苹果, 半瓶水, 半个小时.
Self-measuring time words take 半 directly: 半天, 半年, 半分钟 — but 小时 needs 个 (半个小时).
For "one and a half," 半 flips to after the measure word: 一个半小时, 三个半月, 一年半; clock "half past" is 两点半.
半 ≠ 一半: 半 = "half a unit" (needs a MW); 一半 = "half of it," a standalone fraction.
Use 两, not 二, before a measure word: 两个半小时, not 二个半小时.

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