Counting & Units: 개, 명, 잔, 병
Learn Sino-Korean numbers and counting units (classifiers) for everyday objects.
Counter words (classifiers) are the bridge between numbers and the things you're counting. You do not say 'three books' in Korean — you say 'books three 권' where 권 is the counter for bound volumes. The number is almost always native Korean (한, 두, 세, 네 for the modifying forms of 1-4).
Key counters: 개 (general objects), 명 (people), 잔 (cups/glasses), 병 (bottles), 마리 (animals), 장 (sheets of paper), 권 (books). When in doubt, 개 is the universal fallback — 'two of something' as 두 개 will be understood even if a more specific counter exists. Word order: noun + number + counter. 사과 세 개 (three apples), 사람 두 명 (two people), 커피 한 잔 (one cup of coffee). This pattern is identical to Japanese (りんご三個, ひと二人, コーヒー一杯), so Japanese speakers can pick it up almost instantly.
Native Korean Numbers with Counters
Counters use native Korean numbers (하나→한, 둘→두, 셋→세, 넷→네). The pattern is: Noun + Number + Counter. Note: 하나/둘/셋/넷 shorten before counters.
Sino-Korean Numbers (일, 이, 삼...)
Sino-Korean numbers (일=1, 이=2, 삼=3, 사=4, 오=5, 육=6, 칠=7, 팔=8, 구=9, 십=10) are used for dates, money, phone numbers, and minutes. Native Korean numbers are used with most counters.
How It Works
Korean counting has two moving parts: which number system you use, and which counter the noun requires. The two decisions are separate, and confusing them is the usual source of error.
Counters almost always take native Korean numbers, and four of those numbers shorten before a counter: 하나→한, 둘→두, 셋→세, 넷→네. So it is 한 개, 두 명, 세 잔, 네 병. The unshortened forms never appear directly before a counter.
The word order is noun, then number, then counter: 학생 네 명, 맥주 세 병. This differs from English, where the number comes first, and it is worth drilling as a fixed shape rather than translating each time.
Sino-Korean numbers take over for a specific set of domains: dates, minutes, money, floor numbers, phone numbers and anything above about ninety-nine. 삼천 원, 이 월 십오 일, 오 분. The division is not arbitrary — it broadly tracks whether the quantity is being counted out or being read off a scale.
Which counter to use is vocabulary rather than grammar. 개 for general objects, 명 for people, 잔 for cups and glasses, 병 for bottles, 권 for books, 마리 for animals. Japanese speakers will find this familiar territory, since 個・名・杯・本・冊・匹 map closely.
Where You'll Hear It
Ordering is where counters earn their keep. 맥주 두 병 주세요 and 커피 세 잔 주세요 are complete, natural orders that need nothing added. Being able to produce these smoothly changes a restaurant interaction from stressful to routine.
명 comes up before you even sit down, since staff ask 몇 분이세요? on arrival. 개 is your fallback for anything you cannot name: pointing and saying 이거 두 개 주세요 works in markets, bakeries and convenience stores alike, and it lets you buy things whose Korean names you have not learned yet.
The Sino-Korean domains show up in parallel during the same transactions. You count items with native numbers but read the price with Sino-Korean ones, so a single purchase often uses both systems within seconds of each other — 세 개에 오천 원이에요.
마리 is worth noting for food as well as pets, since fish and chicken are counted with it on menus. 권 appears in bookshops and libraries, where 책 세 권 is the normal way to talk about a stack of books.
Cultural & Language Note
Counters are one of the few areas where Japanese speakers have a real head start over English speakers but still cannot coast. Korean 개, 명, 마리 line up conceptually with 個, 名, 匹, and the idea that you cannot just say 'three things' is already familiar. The catch is that Korean pairs counters with native numbers while Japanese uses Sino-Japanese readings for most, so the habit transfers but the forms do not.
Common Mistakes to Avoid
Using Sino-Korean numbers with 개 is the most common error: it is 사과 세 개, never 사과 삼 개. The number also comes after the noun in the standard pattern — noun, number, counter. Learners transferring English order produce 세 개 사과, which is understandable but marked.
How to Practice This Lesson
Learn numbers already fused to counters. 한 개, 두 개, 세 개, 네 개, 다섯 개 as a single run, then the same with 명, 잔 and 병. The shortened forms then never have to be recalled separately, because you will have learned them in the only position where they occur.
Drill the word order physically. Put four cups on a table and say 컵 네 개, then two bottles and say 병 두 개. Arranging real objects while speaking attaches the noun-number-counter order to an action rather than to a rule.
Japanese speakers should map the counters onto their Japanese equivalents and move quickly — this is one of the places where the two languages line up well. Spend the time you save on the native-versus-Sino division, which has no Japanese parallel and is where the real difficulty lies.