二 vs 两 | Chinese (Mandarin) Grammar

English has one word, "two," that covers everything: the abstract digit, the position in a sequence, and the quantity of some object. Chinese splits that job between two words — 二 (èr) and 两 (liǎng) — and choosing wrong is one of the most immediately noticeable beginner errors, on par with dropping a measure word. The good news is that the split follows a clean logic once you see it: 二 is the number as a label or digit; 两 is the number as a count of things. Learn that distinction and nearly every case decides itself.

The core split: label vs. count

Think of 二 as the "two" you write on a page or say when reciting — the pure digit, the ordinal, the mathematical value. Think of 两 as the "two" that answers how many things? — it points at a quantity and almost always has a measure word (or a big place word) right behind it.

Use 二 (èr) when…	Example	Use 两 (liǎng) when…	Example
counting aloud	一、二、三 (yī, èr, sān)	counting things (before a measure word)	两个人 (liǎng ge rén)
the tens digit	十二 (shí'èr), 二十 (èrshí)	a leading "two" before 千/万/亿	两千 (liǎngqiān)
ordinals	第二 (dì-èr), 二楼 (èr lóu)	"two o'clock"	两点 (liǎng diǎn)
dates & months	二月 (èr yuè), 二号 (èr hào)	durations with a measure noun	两天 (liǎng tiān), 两年 (liǎng nián)
years, read digit by digit	二〇二四年 (èr líng èr sì nián)	200 / 2,000 standing alone	两百 / 两千
decimals & arithmetic	三点二 (sān diǎn èr), 二加二 (èr jiā èr)

现在两点了，我们走吧。

xiànzài liǎng diǎn le, wǒmen zǒu ba

It's two o'clock now, let's go.

我的生日是二月二号。

wǒ de shēngrì shì èr yuè èr hào

My birthday is February 2nd.

The clock example is the classic trap: "two o'clock" is 两点 (liǎng diǎn), because you are counting two hours-worth on the clock — but the month "February" is 二月 (èr yuè) and the day "the 2nd" is 二号 (èr hào), because those are ordinals, labels for a position. Same "two," three different words, all in a sentence a learner uses on day one.

Before a measure word: always 两

This is the most reliable rule of all, so lock it in first. When "two" sits directly in front of a measure word, it is 两, one hundred percent of the time. 两个 (two, general), 两本 (two books), 两杯 (two cups), 两次 (two times) — never 二个, never 二本.

我要两个，谢谢。

wǒ yào liǎng ge, xièxie

I'll take two, thanks.

这个字我写错了两次。

zhège zì wǒ xiěcuò le liǎng cì

I wrote this character wrong twice.

我养了两只猫。

wǒ yǎng le liǎng zhī māo

I have two cats.

This rule quietly extends to time words that are themselves measure words — 两天 (two days), 两年 (two years), 两个星期 (two weeks) — because 天 and 年 count directly like measure words. Compare 二月 (February, an ordinal label) with 两个月 (two months, a counted duration): the first is a name, the second is a quantity.

我在北京住了两年。

wǒ zài Běijīng zhù le liǎng nián

I lived in Beijing for two years.

Before big place words: 两 leads, 二 lives inside

When "two" is the leading digit before 百, 千, 万 or 亿, use 两: 两百 (200), 两千 (2,000), 两万 (20,000), 两亿 (200 million). But when the "two" is a digit sitting inside a longer number — in the tens place, or a hundred that follows a bigger unit — it reverts to 二, because there it is just a digit, not a leading count.

请给我两千块。

qǐng gěi wǒ liǎngqiān kuài

Please give me two thousand yuan.

这个城市有两百万人。

zhège chéngshì yǒu liǎngbǎi wàn rén

This city has two million people.

So 22 is 二十二 (èrshí'èr) — both twos are 二, because one is the tens digit and one is the units digit, neither a leading count before a place word. And 120 is 一百二十 (yìbǎi èrshí) — the 二 is the tens digit. The single genuinely fuzzy case is a standalone 200: both 两百 and 二百 (èrbǎi) are correct, with 两百 more common in the south and standard teaching, 二百 more common in the north. Don't lose sleep over that one; before 千/万/亿 the choice is firmly 两.

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A quick self-test: could you replace "two" with "a couple of / a pair of" and still mean the same count of objects? If yes, it's 两 (两个苹果 = a couple of apples). If "two" is a label, position, or bare digit — a date, a floor, a math value — it's 二.

There is even a fossilized idiom worth knowing: 二百五 (èrbǎiwǔ), literally "250," is slang for a foolish, reckless person — a rare case where the number itself carries meaning. It keeps 二 because it's a fixed digit-string, not a live count.

Common Mistakes

1. Using 二 before a measure word. The number-one 二/两 error — before any measure word it must be 两.

❌ 我有二个问题。

Incorrect — before the measure word 个 use 两, not 二.

✅ 我有两个问题。

wǒ yǒu liǎng ge wèntí

I have two questions.

2. Saying 两 for a floor, month, or ordinal. Positions and labels take 二.

❌ 他住在两楼。

Incorrect — 'second floor' is an ordinal: 二楼, not 两楼.

✅ 他住在二楼。

tā zhù zài èr lóu

He lives on the second floor.

3. Saying 二点 for two o'clock. The clock counts hours, so it's 两点.

❌ 我们二点见。

Incorrect — 'two o'clock' is 两点; 二点 is not said.

✅ 我们两点见。

wǒmen liǎng diǎn jiàn

Let's meet at two o'clock.

4. Using 二 before 千/万. A leading "two" before these place words is 两.

❌ 二万人

Unnatural — before 万 the leading 'two' is 两: 两万人.

✅ 两万人

liǎng wàn rén

twenty thousand people.

Key Takeaways

二 (èr) is the number as a label or digit: counting aloud, tens (二十, 十二), ordinals (第二, 二楼), dates (二月, 二号), years, decimals, arithmetic.
两 (liǎng) is the number as a count of things: always before a measure word (两个, 两本), and for durations (两天, 两年).
Before 千/万/亿 a leading "two" is 两 (两千, 两万, 两亿); a "two" buried inside a number stays 二 (二十二, 一百二十).
Standalone 200 allows both 两百 and 二百 — the only genuinely optional case.
The clock is 两点, but the month and the date are 二月 / 二号 — count vs. label in a single breath.

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