Korean Numbers: Two Counting Systems, and Which One to Use

A receipt says 3,500. The next one says 35,000. Read them aloud in Korean and only the first behaves the way a phrasebook led you to expect.

3,500 is 삼천오백 (sam-cheon-o-baek) — three thousand five hundred, in that order, exactly as written.

35,000 is 삼만 오천 (sam-man o-cheon). There is no “thirty-five” in it and no “thousand” at the front. It is three man, five cheon — three ten-thousands and five thousands. The comma printed on the receipt is not where the language breaks the number.

That is one of the two things about Korean numbers nobody warns you about. The other is that there are two complete sets of them, and choosing the wrong set does not come out as an accent. It comes out as a word the other person has to stop and decode.

The comma is in the wrong place

English chops long numbers into threes, and it has a name waiting at each chop: thousand, million, billion. Korean chops into fours, and has names waiting at those: 만 (man), 억 (eok), 조 (jo).

This is not an informal habit. It is written into the national orthography.

수를 적을 적에는 ‘만(萬)’ 단위로 띄어 쓴다.

When writing out numbers, space them in units of ‘man (10,000)’.

National Institute of Korean Language, Korean Orthography, Article 44 국립국어원 「한글 맞춤법」 제44항 28 March 2017

The commentary published underneath the rule explains why the 1933 draft’s ten-based spacing was abandoned: grouping in units of 10,000 is what matches the way the numbers are actually said out loud. The rule follows the mouth, not the arithmetic.

The working method is to cover the last four digits with your thumb. Whatever is left is the number of 만.

On the tag	Cover four	Say
35,000	3 · 5000	삼만 오천 (sam-man o-cheon)
120,000	12 · 0000	십이만 (sip-i-man)
1,500,000	150 · 0000	백오십만 (baek-o-sip-man)

Once that lands, a great deal of ordinary Korean stops being noise. Spoken prices, salary figures, apartment sizes and news headlines are all built on 만, and the digit you were reaching for — the thousands digit — is usually not the one being said.

Two sets, and they are not spare copies of each other

Korean kept its own inherited numerals and also borrowed the Chinese ones. Both survive, in full, side by side.

	Native (하나 set)	Sino-Korean (일 set)
1	하나 (ha-na)	일 (il)
2	둘 (dul)	이 (i)
3	셋 (set)	삼 (sam)
4	넷 (net)	사 (sa)
5	다섯 (da-seot)	오 (o)
6	여섯 (yeo-seot)	육 (yuk)
7	일곱 (il-gop)	칠 (chil)
8	여덟 (yeo-deol)	팔 (pal)
9	아홉 (a-hop)	구 (gu)
10	열 (yeol)	십 (sip)
20	스물 (seu-mul)	이십 (i-sip)

The Sino-Korean set keeps going as far as you need it to. The native set thins out as it climbs, and in ordinary speech it gives out somewhere in the nineties — above that, people move to the borrowed set without appearing to notice. Which is one reason money is counted with the borrowed set: there is no native number waiting at the top of a price tag.

Four of the native numbers change shape when a counting word follows them, and this is the part that makes the set look unfamiliar even to people who have memorised it:

하나 → 한 · 둘 → 두 · 셋 → 세 · 넷 → 네 · 스물 → 스무

You will almost never hear 하나 immediately before a noun. You will hear 한.

Which word takes which set

Korean does not put a number directly onto a noun. Something goes in between — a counting word — and Korean orthography treats that word as a separate word with a space in front of it.

Article 43 of the same document lists a dozen of them as its worked examples: 한 개, 차 한 대, 소 한 마리, 옷 한 벌, 열 살, 집 한 채, 신 두 켤레. Every one of those examples uses a native number.

The rule itself is only about spacing. What set a given counting word takes is not stated anywhere as a single rule — it belongs to each word, and you learn it with the word. But the split is far from random, and this much is reliable:

Native numbers (한, 두, 세…)	Sino-Korean numbers (일, 이, 삼…)
개 (gae) — objects	원 (won) — money
명 (myeong) — people	분 (bun) — minutes
마리 (ma-ri) — animals	초 (cho) — seconds
병 (byeong) — bottles	층 (cheung) — floors of a building
잔 (jan) — glasses, cups	년 (nyeon) — years, dates
그릇 (geu-reut) — bowls	월 (wol) / 일 (il) — months, days
살 (sal) — years of age	호 (ho) — room numbers
시 (si) — the hour	인분 (in-bun) — portions of food

The pattern behind it, if you want one: things you can point at and count off tend to take the native set; things that are really positions on a scale — money, clock minutes, floors, calendar dates — take the borrowed one. That is a rule of thumb and not a law, and there are counting words that take both with a change of meaning.

One further oddity from Article 43’s own list, worth knowing because no English guide mentions it. 세 has two extra shapes of its own — 서 and 석 — which attach to particular counting words. Both of the rule’s examples mean three: 금 서 돈 (seo don), gold measured in don, and 종이 석 장 (seok jang), three sheets of paper. If you hear 석 where you were expecting 세, nothing has changed but the counting word after it.

The clock uses both sets in a single breath

This is the place the two systems collide most visibly, and Article 43 demonstrates it without meaning to. Among its examples of number-plus-unit written closed up, it prints:

두시 삼십분 오초 — two o’clock, thirty minutes, five seconds.

두 is native. 삼십 and 오 are Sino-Korean. The switch happens between the hour and the minute, mid-phrase, every single time anyone says a time in Korean.

So 2:30 is 두 시 삼십 분 (du-si sam-sip-bun). Not 이 시. Not 두 십 분. Hours belong to one set and minutes to the other, and there is no version of Korean in which you may pick one set and stay in it.

If you already know how Korean age was recalculated in 2023, you have met the same seam from the other side: 살 takes the native numbers, 세 takes the Sino-Korean ones, and which word a form asks for tells you which number to write.

인분 — the word on every grill menu that is not in the dictionary

Meat and stew restaurants in Korea usually do not sell you a portion. They sell you 인분 (in-bun), and the menu prices one of them.

Here is something we did not expect to find. 인분 in that sense is not in the Standard Korean Dictionary. Searching the National Institute of Korean Language’s standard dictionary for 인분 returns three entries — 人糞, human excrement; 燐分, phosphorus content; 鱗粉, the scale-dust on a moth’s wing. The one printed on the menu is not among them.

It is in the institute’s other dictionary, the open one, and the definition there carries the rule you need:

사람 수를 기준으로 분량을 세는 단위. 한자어 수와 함께 쓴다.

A unit that counts quantity on the basis of the number of people. Used together with Sino-Korean numerals.

National Institute of Korean Language, Urimalsaem open dictionary — 인분 (bound noun) 국립국어원 「우리말샘」 — 인분(人分), 의존 명사 19 August 2026

한자어 수와 함께 쓴다 — used with Sino-Korean numbers. So it is 일인분, 이인분, 삼인분 (il-in-bun, i-in-bun, sam-in-bun). Never 한 인분, never 두 인분. This is one of the few places where the choice is written down as part of the word’s definition rather than left to be absorbed, and it is also one of the few places where getting it wrong changes what a stranger has to do about it, because they are holding a pen over an order pad.

The practical shape of the problem is this. Grill and stew houses commonly price a dish per 인분 and take orders in multiples of two, which leaves a solo diner standing at the door doing arithmetic they cannot check. We have not found any rule or published figure that says how widely the two-portion floor applies, and we are not going to invent one. What we can give you is the question that settles it in four syllables, asked at the door rather than after you sit down:

1인분 돼요? (il-in-bun dwae-yo) — “is one portion possible?”

If the answer is no, nothing has gone wrong and nobody is annoyed; you have found out at the door, which is the entire point. It sits naturally alongside the other phrases that carry an ordinary Korean meal, and reading what the last word on the sign tells you about the restaurant will often tell you in advance whether 인분 is going to be how this place counts at all.

What this article does not claim

The two orthography rules quoted above — Article 43 on counting words and Article 44 on grouping by 10,000 — are the current text of 한글 맞춤법, in force since 28 March 2017, read on the National Institute of Korean Language’s own norms site on 19 August 2026. The 두시 삼십분 오초 example and the 서 돈 / 석 장 examples are the institute’s, not ours; we have not added examples of our own to the quoted lists, because the value of quoting a rule disappears the moment you pad it.

The table of which counting words take which number set is not quoted from a rule, because no such single rule exists. It reports ordinary usage, and we have checked 개 and 인분 individually in the dictionaries. Treat the rest as reliable rather than as authority, and note that a few counting words take either set with a shift in meaning. The “rule of thumb” paragraph is our reading of the pattern, offered as a memory aid and not as grammar. The same applies to the statement that the native numbers give out in the nineties: that is a description of how people speak, not a limit written down anywhere, and the native forms above that point do exist.

We make no claim about restaurant policy. That grills and stews are often sold in twos is what we have seen and heard reported; it is not a regulation, we found no published figure for how common it is, and it is not the kind of thing a primary source counts. We have therefore given you a question to ask instead of a number to rely on. If you want prices rather than counting words, what meals actually cost is checked separately and carries its own dates.

Finally, this article teaches you to read and say numbers. It does not teach the sound changes that happen when some of these numbers meet the words after them, which are real and which we have left for their own piece.