The number two is the first place Chinese quietly refuses to behave like English. Where English gets by with a single word, Chinese keeps two and never lets them trade places: 二 (èr) and 两 (liǎng). The split is not regional whim or politeness — it tracks a real grammatical difference. 二 is the two you recite and label with: the digit in a sequence, the rung on a ladder of ordinals, the figure in a sum. 两 is the two you count things with, the one that leans forward into a measure word and a noun. Say 二个人 and a native speaker winces; say 两楼 for "the second floor" and they simply won't understand. This page gives you a single test that settles every case.
The one-line test: is a measure word coming next?
Look at what follows the "two." If a measure word (or a classified noun, or a clock hour) comes next, use 两. If nothing does — you're counting aloud, giving an ordinal, reading digits, doing math, or the two is buried inside a larger number — use 二.
| Use 两 (liǎng) when… | Use 二 (èr) when… |
|---|---|
| a measure word follows: 两个人 (two people) | counting aloud: 一、二、三 |
| a clock hour: 两点 (2 o'clock) | an ordinal: 第二 (second) |
| days/years as amounts: 两天 (two days) | a two inside a bigger number: 十二 (12), 二十 (20) |
| leading big units: 两百, 两千, 两万 | digits, decimals, math: 0.2, 二加二 |
两: two of something, before a measure word
This is the everyday "two" of shopping, ordering, and scheduling. It cannot stand alone as an abstract number — it always points forward to a measure word and the thing being counted. Because Chinese requires a measure word between a number and a noun, 两 shows up constantly.
我们两个人点了三个菜。
wǒmen liǎng ge rén diǎn le sān ge cài
The two of us ordered three dishes. (informal) — 两个 with the measure word 个 before 人.
来两杯咖啡，谢谢。
lái liǎng bēi kāfēi, xièxie
Two coffees, please. (informal) — 两 before the measure word 杯.
我请了两天假，想去海边。
wǒ qǐng le liǎng tiān jià, xiǎng qù hǎibiān
I took two days off — I want to go to the beach. (informal) — 两天, an amount of days.
Clock hours are the classic trap: 2 o'clock is 两点, because 点 is functioning as a measure word here.
我们下午两点在门口见。
wǒmen xiàwǔ liǎng diǎn zài ménkǒu jiàn
Let's meet at the entrance at two this afternoon. (neutral) — 两点 for the clock time.
二: the counting-and-labeling two
When the two is a name for the number itself — recited, ranked, read digit by digit, or embedded in a bigger figure — it's 二. This covers ordinals with 第, floor and grade numbers, decimals, arithmetic, phone and room numbers, and any two sitting in the tens or ones place of a larger number.
这是我第二次来北京。
zhè shì wǒ dì'èr cì lái Běijīng
This is my second time in Beijing. (neutral) — 第二, an ordinal, so 二.
洗手间在二楼，电梯上去左转。
xǐshǒujiān zài èr lóu, diàntī shàng qù zuǒ zhuǎn
The restroom's on the second floor — take the lift up and turn left. (neutral) — 二楼 labels floor number 2.
我弟弟今年十二岁，读初一。
wǒ dìdi jīnnián shí'èr suì, dú chū yī
My little brother is twelve this year, in his first year of middle school. (informal) — 十二 has 二 in the ones place, even though 岁 is a measure word.
That last one is the hinge of the whole system: 十二岁 uses 二, not 两, because the two here is part of the number twelve, not a standalone "two." Compare 两岁 (two years old) with 十二岁 (twelve years old) — the first counts, the second labels.
The big-number twist: 两百, 两千, 两万
When two leads a large unit — hundreds, thousands, ten-thousands — 两 quietly takes over, because you're really saying "two hundreds," "two thousands." See hundreds and thousands for the full picture.
- 200: 两百 and 二百 are both correct; 两百 is more common in speech, 二百 leans northern/written.
- 2,000 / 20,000: strongly prefer 两千 and 两万 (二千 / 二万 sound off to most speakers).
- But a two in a lower slot stays 二: 一千二百 (1,200), 二十二 (22).
这条裙子两百块，那条才一百二。
zhè tiáo qúnzi liǎng bǎi kuài, nà tiáo cái yìbǎi èr
This skirt is two hundred kuai; that one's only a hundred and twenty. (informal) — 两百 leads the hundreds; 一百二 keeps 二 in the tens slot.
他们公司有两千多名员工。
tāmen gōngsī yǒu liǎng qiān duō míng yuángōng
Their company has over two thousand employees. (neutral) — 两千 for 2,000.
Common Mistakes
1. Using 二 before a measure word. The single most common slip: 二个, 二点, 二天. Before a measure word it must be 两.
❌ 我买了二个苹果。
Incorrect — before the measure word 个, use 两: 我买了两个苹果。
✅ 我买了两个苹果。
wǒ mǎi le liǎng ge píngguǒ
I bought two apples. — 两 before 个.
2. Using 两 inside a bigger number. A two in the tens or ones place is part of the number and stays 二.
❌ 现在是十两点。
Incorrect — twelve o'clock is 十二点; the 二 is part of 'twelve'.
✅ 现在是十二点，该睡了。
xiànzài shì shí'èr diǎn, gāi shuì le
It's twelve o'clock now — time for bed. — 十二 keeps 二.
3. Using 两 for an ordinal. Ordinals with 第 are labels, never counts.
❌ 我坐第两排。
Incorrect — 'second row' is 第二排; ordinals take 二, never 两.
✅ 我坐第二排。
wǒ zuò dì'èr pái
I sit in the second row. — 第二 with 二.
4. Reading digits with 两. Read aloud digit by digit (room numbers, years, phone numbers), each figure is 二.
❌ 我的房间是两零两。
Incorrect — room 202 read digit-by-digit is 二零二.
✅ 我的房间是二零二。
wǒ de fángjiān shì èr líng èr
My room is 202. — digits are read with 二.
Key Takeaways
- 两 = two of something, used before a measure word or classified noun: 两个人, 两点, 两天, 两杯咖啡.
- 二 = the number two as a label: counting (一二三), ordinals (第二), floor and grade numbers (二楼), decimals (零点二), math (二加二), and any two inside a larger number (十二, 二十).
- Leading a big unit flips to 两: 两百 / 二百 both fine, but 两千 and 两万 are strongly preferred.
- The test never fails: "two what?" If a measure word is coming, it's 两; if you're just naming the number, it's 二.
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- 二 vs 两HSK 1 — Chinese has two words for 'two': 二 (èr) is the counting digit — used in ordinals, tens, years and decimals — while 两 (liǎng) means 'two of something' before a measure word and before 千/万/亿.
- Why Classifiers Are ObligatoryHSK 1 — Whenever you count a noun or point at it, Chinese demands a measure word between the number/demonstrative and the noun — 三本书, not 三书 — because a bare Chinese noun names a kind of thing, not a countable unit, so a classifier is what packages it into countable units.