세 고양이 looks like a perfectly reasonable way to say “three cats.” Both words are right — 세 is three, 고양이 is cat — and in everyday speech it still sounds off to a Korean ear.
The sentence a Korean speaker expects is 고양이 세 마리. The noun comes first, the number comes second, and a third word you never asked for comes last.
That third word is a counter. When Koreans count things, they almost always name the unit the thing comes in.
English does this too, quietly: three sheets of paper, two loaves of bread, a pair of shoes. The difference is that English only asks for it sometimes. Korean expects it nearly every time — and it has a different counter for books, animals, machines, flat things, and people you respect.
This guide covers the word order, which number system each counter takes, the fifteen counters worth memorising, and the one counter that will save you when you forget the rest.
The One Rule
Noun + Number + Counter
고양이 세 마리 — three cats
Not three cats. Cats three animal-units.
| Korean | Literal | English |
|---|---|---|
| 사과 세 개 | apple three units | three apples |
| 사람 두 명 | person two people-units | two people |
| 책 한 권 | book one volume | one book |
| 커피 네 잔 | coffee four cups | four cups of coffee |
The noun leads. This feels backwards for the first week and then stops feeling like anything at all.
You will occasionally see the number first — 두 사람 (the two of them), or a story title like 세 친구 (Three Friends) — but those are set phrases and written style. For counting things in everyday speech, the noun comes first.
Which Number System?
Korean has two number systems, and counters split between them. If that split is new to you, our guide to Korean numbers covers both sets.
Counters for things, people and animals take native Korean numbers. 하나, 둘, 셋, 넷, 다섯…
Money, measurements, dates and labels take Sino-Korean. 일, 이, 삼, 사, 오…
| Native Korean | Sino-Korean |
|---|---|
| 개 (things) | 분 (minutes) |
| 명 · 분 (people) | 원 (won) |
| 마리 (animals) | 층 (floors) |
| 권 (books) | 인분 (servings) |
| 잔 (cups) | 년 (years) |
| 병 (bottles) | 개월 (months) |
| 살 (age) | 학년 (school year) |
| 시 (o’clock) | 일 (calendar days) |
When in doubt, use native. Most of the counters you will use for everyday objects are native; the Sino group is mostly measurements and calendar words.
One limit: native numbers stop at 99. From 100 up, every counter takes Sino — 사과 백 개, 학생 백오십 명 — and with large numbers people often switch to Sino even before that. 학생 사십오 명 is as common as 마흔다섯 명.
You have already met this split. In our guide to telling time in Korean, 시 takes native numbers and 분 takes Sino — 세 시 삼십 분. Those are counters doing exactly what counters do.
The Shortening — Again
Native numbers change shape in front of a counter. These are the same five from our numbers guide.
| Standalone | Before a counter |
|---|---|
| 하나 | 한 |
| 둘 | 두 |
| 셋 | 세 |
| 넷 | 네 |
| 스물 | 스무 |
✗ 하나 개 · ✓ 한 개
✗ 스물 살 · ✓ 스무 살
Everything else stays as it is: 다섯 개, 열 개, 서른 개, 마흔 개. Only these five change, and 스물 → 스무 is the one people forget because it arrives later.
Inside a bigger number, only the last part changes: 열한 개, 스물두 살, 서른네 명. That is why twenty-one is 스물한 살, not 스무한 살.
The Fifteen That Matter
There are dozens. You need about fifteen.
| Counter | For | Example |
|---|---|---|
| 개 | things, general | 사과 두 개 — two apples |
| 명 | people (plain) | 학생 세 명 — three students |
| 분 | people (polite) | 손님 두 분 — two guests |
| 마리 | animals, fish, insects | 개 한 마리 — one dog |
| 권 | books, notebooks | 책 다섯 권 — five books |
| 장 | flat things — paper, tickets, photos | 티켓 두 장 — two tickets |
| 대 | machines, cars, phones | 자동차 한 대 — one car |
| 병 | bottles | 맥주 세 병 — three beers |
| 잔 | cups, glasses | 커피 두 잔 — two coffees |
| 그릇 | bowls of food | 밥 한 그릇 — one bowl of rice |
| 켤레 | pairs of shoes, socks | 신발 한 켤레 — one pair of shoes |
| 벌 | sets of clothing | 옷 두 벌 — two outfits |
| 살 | age | 스무 살 — twenty years old |
| 번 | times, occurrences | 두 번 — twice |
| 인분 | servings of food | 삼겹살 이 인분 — two portions |
Note the last one. 인분 is Sino-Korean — 일 인분, 이 인분, 삼 인분. Everything above it on this list is native. This catches people at the barbecue table constantly, which is why it comes up in our guide to ordering food in Korean.
개 Is Your Safety Net
If you forget the right counter, use 개.
For inanimate objects it is either correct or close enough that nobody stops the conversation. 볼펜 두 개, 의자 세 개, 가방 한 개 — all fine.
It does not work for people or animals. ✗ 사람 두 개 is not a small slip; it is grammatically wrong and sounds like you are counting objects. Use 명 for people and 마리 for animals, always.
That is the whole survival strategy: learn 개, 명, 마리 properly, and let 개 cover the rest until the others arrive naturally.
Counting People: 명 · 분 · 사람
Three options, and the difference is respect.
| Korean | Register | Use for |
|---|---|---|
| 명 | neutral | friends, classmates, general counting |
| 분 | honorific | customers, elders, teachers, strangers |
| 사람 | plain | interchangeable with 명 in casual speech |
At a restaurant door you will be asked:
몇 분이세요?
myeot buniseyo — how many in your party? (polite)
The answer uses 명 about yourself — you do not honour your own group.
네 명이에요. — Four people.
Careful: 분 is also the counter for minutes, but that one is Sino-Korean. 한 분 = one person (polite). 일 분 = one minute. Same syllable, different number system, completely different meaning.
Word Order and Particles
In the basic pattern, the particle goes after the counter, not the noun.
사과 세 개를 샀어요. — I bought three apples.
You can also front the noun with its own particle, and both are natural:
사과를 세 개 샀어요.
If particles are still slippery, our guide to Korean particles covers which one goes where.
The reversed form exists too. 세 개의 사과 — literally “apples of three units” — is grammatical but literary. You will see it in writing and almost never hear it. Stick with 사과 세 개.
Asking How Many
몇 is “how many,” and it takes a counter just like a number does.
| Korean | Meaning |
|---|---|
| 몇 개예요? | How many (things)? |
| 몇 명이에요? | How many people? |
| 몇 분이세요? | How many people? (polite) |
| 몇 마리예요? | How many animals? |
| 몇 살이에요? | How old are you? |
| 몇 번 갔어요? | How many times did you go? |
몇 never takes a number in front of it. It replaces the number.
When the Number Stands Alone
Drop the counter and the number goes back to its base form.
이거 하나 주세요. — One of these, please.
Not 이거 한 주세요. Without a counter behind it, 하나 stays 하나. This is the phrase you will use most often while shopping, and it sidesteps the counter problem entirely.
The same works after a noun for small numbers: 사과 하나 주세요 (one apple, please), 아이가 둘이에요 (I have two children). It is the one common way to count without a counter.
Counting out loud works the same way: 하나, 둘, 셋 — no counters, base forms.
달 or 개월, 살 or 세
Two pairs that trip people up, because each has a native and a Sino version.
| Meaning | Native | Sino |
|---|---|---|
| months (duration) | 한 달, 두 달 | 일 개월, 이 개월 |
| age | 스무 살 | 이십 세 |
For one or two months, people say 한 달 and 두 달; 일 개월 is what you see in contracts, visas and medical instructions. For longer spans 개월 is everyday speech too — 육 개월, and a baby’s age in months, 십팔 개월. 스무 살 is how anyone actually says their age; 이십 세 belongs on forms and in the news.
One pattern worth recognising: for three and four months you will also hear 석 달 and 넉 달 alongside 세 달 and 네 달. 셋 and 넷 have extra forms — 석, 넉 — that survive before a few units. You do not need to produce them. You do need to not be confused when someone says 석 달.
번 Does Two Jobs
번 counts occurrences with native numbers:
두 번 봤어요. — I saw it twice.
번 also labels numbers — bus routes, building entrances, question numbers — and there it takes Sino:
몇 번 버스예요? — Which bus number?
삼 번 출구 — Exit 3
Same syllable. Twice is 두 번. Number two is 이 번 — usually written 2번, which also keeps it apart from 이번 (“this time”). The number system tells you which one is meant.
Try It: Count Eight Things
Write these in Korean. Answers below.
- two apples → ?
- three people (plain) → ?
- one dog → ?
- four cups of coffee → ?
- twenty years old → ?
- two tickets → ?
- two portions of samgyeopsal → ?
- How many people? (polite) → ?
Answers:
- 사과 두 개
- 사람 세 명
- 개 한 마리
- 커피 네 잔
- 스무 살 — not 스물 살
- 티켓 두 장
- 삼겹살 이 인분 — Sino, not 두 인분
- 몇 분이세요?
Six or more and the pattern has landed.
Frequently Asked Questions
Do I really have to use a counter every time?
Almost always. The exceptions are a number on its own — 하나 주세요 — and a bare native number after the noun for small counts, like 사과 하나 주세요. As soon as a counter is there, the number takes its short form: 사과 한 개.
How many counters do Koreans actually use?
Everyday speech runs on about fifteen to twenty. Dictionaries list hundreds, most of them specialised — 척 for ships, 자루 for pencils, 송이 for flowers. Learn them when you meet them.
Do counters change with plurals?
No. Korean counters never take 들 and never change form for quantity. 개 한 마리 and 개 열 마리 use the same 마리.
Start With 개, 명 and 마리
Counters are the third leg of the number system. You learn the two sets of numbers, you learn where each one goes, and then you discover that neither works on its own — every count needs a unit attached.
The good news is the shape hardly varies. Noun, number, counter. Once that order is automatic, adding a new counter is just vocabulary.
Start with three: 개 for things, 명 for people, 마리 for animals. Those three cover most of a day. Add 잔, 병 and 장 the first time you order coffee, buy water, or take a ticket, and the rest will arrive on their own schedule.
If you are working through the stages in order, this belongs beside Korean numbers and telling time in Korean in Stage 3 of our complete beginner’s roadmap.
Written by Minhyung Cha — 25 years teaching Korean, and 15+ years running an English academy in South Korea. I live and work in Busan, and every example on this site is checked as a native speaker. More about KEL.
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