The Korean counting system looks intimidating because it contains two parallel sets of numbers: Sino-Korean (il, i, sam) and native Korean (hana, dul, set). Learners usually panic, but the logic is simple: each system has its own jobs, and choosing wrong simply sounds unnatural. This guide explains which numbers belong to which system, how to build numbers in both, and the special rules for time, age, and money, including the counters you will need from day one.
The Two Systems at a Glance
Sino-Korean numbers come from Chinese and cover anything official or mathematical — money, dates, phone numbers, and large numbers. Native Korean numbers are used to count everyday things together with counters: people, objects, animals, cups, ages, and hours.
| Number | Sino-Korean | Native Korean |
| --- | --- | --- |
| 1 | 일 (il) | 하나 (hana) |
| 2 | 이 (i) | 둘 (dul) |
| 3 | 삼 (sam) | 셋 (set) |
| 4 | 사 (sa) | 넷 (net) |
| 5 | 오 (o) | 다섯 (daseot) |
| 6 | 육 (yuk) | 여섯 (yeoseot) |
| 7 | 칠 (chil) | 일곱 (ilgop) |
| 8 | 팔 (pal) | 여덟 (yeodeol) |
| 9 | 구 (gu) | 아홉 (ahop) |
| 10 | 십 (sip) | 열 (yeol) |
Sino-Korean Numbers: Money, Dates, and Official Counts
Use Sino-Korean numbers for prices with 원 (won), dates and years, phone numbers (where 0 is read as 공), minutes on the clock, measurements, and every number from 100 upward. Compounds work like arithmetic: 십 (10), 이십 (20), 삼십 (30), 백 (100), 천 (1,000), 만 (10,000), and a number like 25 is 이십오.
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Money: 만 원 (10,000 won), 오만 원 (50,000 won).
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Date: 2026 is 이천이십육년 in Korean years.
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Phone numbers: 010 is read 공일공 (공 is the Sino word for zero).
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Minutes: 오 분 (five minutes), 삼십 분 (thirty minutes).
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Start Free →Native Korean Numbers: Counting People and Things
Native Korean numbers combine with counters — measure words that follow the number: 명 for people, 개 for objects, 마리 for animals, 잔 for cups, and 장 for sheets and paper. Without a counter, native numbers never count anything on their own.
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People: 세 명 (three people).
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Objects: 두 개 (two items).
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Cups: 네 잔 (four cups).
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Animals: 다섯 마리 (five animals).
Watch the contractions: 하나 → 한, 둘 → 두, 셋 → 세, 넷 → 네 before most counters, and 20 becomes 스무 (스무 살 — 20 years old). These short forms are mandatory in spoken Korean; using the full forms sounds like a textbook.
Time, Age, and Large Numbers: When the Systems Meet
Korean time mixes both systems in a single phrase: hours (시) use native numbers and minutes (분) use Sino-Korean. 3:30 is therefore 세 시 삼십 분 — native 세 for the hour, Sino 삼십 for the minutes. Age works with native numbers plus 살: 스무 살 (20), 서른 살 (30), 마흔 살 (40).
Large numbers always go Sino-Korean, and Korean groups by 10,000 rather than 1,000: 만 (10,000), 십만 (100,000), 백만 (1,000,000). So 15,000 is 만 오천 (10,000 + 5,000), a grouping that surprises English speakers but makes large amounts easy to say once you learn it.
Counters: The Words That Do the Counting
Korean does not count nouns directly; each category has its own counter attached to the native number: 명 (people), 개 (objects), 마리 (animals), 잔 (cups and glasses), 병 (bottles), 장 (paper and sheets), 권 (books), and 살 (age in years). The counter often replaces the noun in speech: 두 잔 주세요 (two cups, please) is how you order coffee or beer.
Building Numbers in Both Systems
Sino-Korean compounds work like math: 십일 (11) is 십 + 일, 이십 (20) is 이 + 십, and 이십오 (25) stacks them in order. Native Korean goes its own way after 10: 열하나 (11), 열둘 (12), 스물 (20), 서른 (30), 마흔 (40), 쉰 (50). Native numbers stop at 99 — anything larger jumps to Sino-Korean, which is why prices and dates above 99 never use native forms. Pronunciation notes: 십 sounds like 'sip' with a quick p, and the vowels of 여덟 stretch, so 여덟 (8) is roughly yeo-deol with two clear syllables.
Age and the Korean Age System
Age combines native numbers with 살, including the special forms 한 살 (1), 두 살 (2), 세 살 (3), 네 살 (4), and 스무 살 (20). Traditionally, Koreans count age from one at birth and add a year on New Year's Day, so your 'Korean age' can be one or two years higher than your international age. When someone asks 몇 살이에요? (how old are you?), answer with the native number plus 살.
Quick Practice
Say these aloud: (1) three people — 세 명; (2) 20,000 won — 이만 원; (3) 5:30 — 다섯 시 삼십 분; (4) seven books — 일곱 권; (5) 40 years old — 마흔 살. Mixing systems in one sentence is normal — Korean speakers do it every time they tell the time.
The Verdict
The Korean counting system is really a decision tree: official, mathematical, and big numbers go Sino-Korean; counting people, objects, and hours goes native. Learn the first ten of both systems, memorize the counters you use daily, and accept the one-time rule about time. Two weeks of practice with prices, ages, and orders will make the choice automatic.
Metheus makes Korean numbers click in context: watch Korean dramas with translated subtitles, hover over any number phrase like 세 명 or 이만 원 to see which system is being used and why, and save it as an SRS flashcard
FAQ
Why does Korean have two counting systems?
Korean uses Sino-Korean numbers, imported centuries ago from Chinese, for official and mathematical contexts: money, dates, phone numbers, and anything over 99. Native Korean numbers are older and are used for counting people, objects, and hours in everyday speech. Both are mandatory for natural Korean, and choosing wrong just sounds odd.
When do I use Sino-Korean numbers?
Use Sino-Korean for prices and money with 원 (won), dates and years, phone numbers, bus and room numbers, measurements, minutes on the clock, and every number from 100 upward: 백 (100), 천 (1,000), 만 (10,000). Official and written contexts almost always prefer Sino-Korean numbers.
When do I use native Korean numbers?
Use native Korean numbers to count people, objects, animals, and cups with counters like 명 (people), 개 (items), and 마리 (animals), and for hours on the clock and ages with 살. Native numbers stop at 99 — from 100 upward you switch to Sino-Korean numbers entirely.
Why do 하나 and 둘 become 한 and 두 before counters?
Counters trigger a contraction in the native numbers 1-4 and 20: 하나 becomes 한, 둘 becomes 두, 셋 becomes 세, 넷 becomes 네, and 20 becomes 스무. So you say 두 개 (two items), not 둘 개, and 세 명 (three people), not 셋 명. These short forms are mandatory in speech.
How do I say the time in Korean?
Hours use native Korean numbers with 시, and minutes use Sino-Korean numbers with 분: 3:30 is 세 시 삼십 분, and 7:05 is 일곱 시 오 분. Note that minute numbers below 10 still use the Sino forms (오, 육, 칠). Most learners find this split confusing, but it becomes automatic with practice.
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