Lesson 8

Sino-Korean vs Native Numbers: Usage Rules

Korean has two number systems. Learn which one to use for time, age, counting, dates, and money.

Choosing between Sino-Korean (일, 이, 삼, ...) and native Korean (하나, 둘, 셋, ...) numbers is one of the most common rule confusions for learners. The split is not random — there are clear categorical rules. Sino-Korean for: dates, months, years, minutes, money, phone numbers, addresses, floors, grades. Native Korean for: hours, age, counting people and objects with counters.

A useful way to remember: 'when the number is the abstract part of a label' (date, price, room number), use Sino-Korean. 'When the number is concretely counting things' (how many cups, how old, how many people), use native Korean. The famous mixed case is time: 'three thirty' is 세 시 (native, for hour) 삼십 분 (Sino, for minutes). This mixed system makes telling time difficult for beginners but quickly becomes automatic with practice. Once the categorical rule clicks, the choice is no longer a guess but a quick lookup against the category.

고유어 숫자 (Native Korean Numbers) — When to Use

Use native Korean numbers (하나, 둘, 셋, 넷, 다섯…) for: hours (한 시, 두 시), age with 살 (한 살, 두 살), counting objects with most counters (한 개, 두 명, 세 잔). Note: 하나/둘/셋/넷 shorten to 한/두/세/네 before a counter.

세 시 오십 분에 만나요.se si osip bune mannayoWe meet at 3:50. (세 시 = native, 오십 분 = sino)

친구가 세 명 왔어요.chinguga se myeong wasseoyoThree friends came. (세 명 = native number + counter)

한자어 숫자 (Sino-Korean Numbers) — When to Use

Use sino-Korean numbers (일, 이, 삼, 사, 오…) for: dates & months (일 월, 이 월), minutes (오 분, 십 분), money (천 원, 만 원), floor numbers (일 층, 이 층), phone numbers, and numbers above 99.

오늘은 이 월 십사 일이에요.oneureun i wol sipa irieyoToday is February 14th. (all sino-Korean)

오만 원짜리 지폐예요.oman wonjjari jipyeyeyoIt's a 50,000 won bill. (oman = sino for 50,000)

하나 / 한hana hanone (native Korean)

Examples아이스크림 한 개 주세요.aiseukeulim han gae juseyoOne ice cream please.

일 (一)ilone (sino-Korean)

Examples오늘은 삼 월 일 일이에요.oneureun sam wol il irieyoToday is March 1st.

시sio'clock (uses native numbers)

Examples지금 두 시 반이에요.jigeum du si banieyoIt is 2:30 now.

분bunminute (uses sino-Korean)

Examples십오 분만 기다려 주세요.sibo bunman gidaryeo juseyoPlease wait just 15 minutes.

살salyears old (uses native numbers)

Examples저는 스물세 살이에요.jeoneun seumulse sarieyoI am 23 years old.

층cheungfloor / story (uses sino-Korean)

Examples카페는 삼 층에 있어요.kapeneun sam cheunge isseoyoThe café is on the 3rd floor.

Cultural & Language Note

The two number systems split by domain in ways that feel arbitrary until you notice the pattern: native numbers count things you can point at, Sino-Korean numbers handle abstractions and measurements. Hence hours are native (세 시) but minutes are Sino (삼십 분), because clock hours were counted long before minutes were measured. Japanese has a similar split between ひとつ・ふたつ and いち・に.

Common Mistakes to Avoid

The time expression is the classic trap: 세 시 삼십 분 mixes both systems in one phrase, and learners tend to make it consistent in one direction or the other. Ages use native numbers with 살, floors use Sino with 층, and money is always Sino. When unsure, note that anything borrowed from a Sino-Korean counter word almost always takes Sino numbers.