号
day of the month; number
hào
What does 号 mean?
号 (hào) is the Chinese word for 'number' in the sense of an identifying label — a date, room, size, phone, or rank. Its most common HSK 1 use is the day of the month: 五月三号 'May 3rd.' In speech, dates are almost always given with 号; the written form 日 (rì) shows up in newspapers, official documents, and formal writing. 号 also labels other identifiers: 几号 'what number / what day,' 房号 'room number,' 大号/小号 'large/small size,' 几号楼 'which building.' Two notes for English speakers: first, 号 comes AFTER the number (三号, not 号三). Second, when asking 'what's the date today?' the natural phrasing is 今天几号? — using 号, not 日.
Note: In dates, 号 is the spoken/everyday word; 日 (rì) is the written/formal equivalent. Newspapers, official documents, and signs prefer 日; conversations and texts almost always use 号.
Character breakdown
number; mark; day (of month)
Memory hook: Think of 号 as a label sticker — it gets stuck after a number to say 'this is identifier #X.'
Measure word for 号
Example sentences
今天几号?
Jīntiān jǐ hào?
What's the date today?
spoken
今天五月三号。
Jīntiān wǔ yuè sān hào.
Today is May 3rd.
spoken
我的房号是二〇五。
Wǒ de fáng hào shì èr líng wǔ.
My room number is 205.
neutral
我要大号的。
Wǒ yào dà hào de.
I want the large size.
spoken
Common phrases with 号
Synonyms
日 is the formal/written word for 'day of the month' (五月三日). 号 is what people say out loud. In conversation, always use 号.
号码 is the full noun 'number' for phones, IDs, and license plates (电话号码 'phone number'). 号 alone is shorter and used as a suffix (房号, 三号).
Don't confuse 号 with
Looks similar in handwriting but 好 means 'good' and is pronounced hǎo (third tone). 号 is hào (fourth tone). Different character, different tone, different meaning.
月 is 'month,' 号 is 'date.' Order matters: 五月三号 (May 3rd) — month first, date second.