Telling Time in Korean: The Hour-Minute Number Rule
Korean tells time with both number systems at once: native for hours (한 시, 두 시), sino for minutes (오 분, 삼십 분). Learn 몇 시예요?, 오전/오후, 반, weekdays, and 에.
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Written by Alvin Lim Certified Korean Language Teacher (Level 2)
Telling time in Korean uses both number systems in one breath: hours take native numbers (한 시, 두 시, 세 시) and minutes take sino numbers (오 분, 십 분, 삼십 분). So 3:30 is 세 시 삼십 분. Master that one mixed rule plus the particle 에 and you can set up any meeting. Shaky on the numbers themselves? Review Lesson 8 and Lesson 7 first.
Time words
The mixed rule
Hours: 한 시, 두 시, 세 시, 네 시 … 열한 시 (11:00), 열두 시 (12:00) — the Lesson 8 shape-change applies. Minutes: 오 분 (5) · 십 분 (10) · 십오 분 (15) · 삼십 분 (30) · 사십오 분 (45). Put together: 1:05 = 한 시 오 분 · 7:45 = 일곱 시 사십오 분 · 12:30 = 열두 시 반. Ask the time with 몇 시예요?
오전 and 오후 go in front of the time: 오전 아홉 시 = 9 AM, 오후 여덟 시 = 8 PM. Korean schedules — trains, cinema apps, opening hours — print the 24-hour clock (14:30), but nobody says it that way: read 14:30 out loud as 오후 두 시 반.
The weekdays
월요일 woryoil — Monday · 화요일 hwayoil — Tuesday · 수요일 suyoil — Wednesday · 목요일 mogyoil — Thursday · 금요일 geumyoil — Friday · 토요일 toyoil — Saturday · 일요일 iryoil — Sunday
The first syllables are the classical elements plus the moon and sun: moon (월), fire (화), water (수), wood (목), metal (금), earth (토), sun (일) — the same system Japanese uses for its weekdays. Ask the day with 무슨 요일이에요?
The particle 에 — marking when
세 시에 만나요 (let’s meet at three) · 토요일에 시간 있어요? (are you free on Saturday?) · 오전 일곱 시에 일어나요 (I get up at 7 AM). One exception to bank now: 오늘 (today), 내일 (tomorrow), and 어제 (yesterday) refuse 에 — say 내일 만나요, never 내일에 만나요.
Setting up tomorrow
Every time expression before 만나요 carried 에 — 몇 시에, 세 시에, 세 시 반에 — exactly as the pattern predicts, while 내일 went without it.
Korean social life runs on the word from the vocab list above: 약속 — one word for both “appointment” and “promise”, which tells you how seriously plans are taken. When a friend proposes 토요일 오후 세 시, answer 좋아요! and be on time; the old stereotype of loose “Korean time” is a generation out of date, now that everyone tracks bus and subway arrivals to the minute. And when you are running late anyway, the magic word is 미안해요 plus a new, concrete time: 세 시 반에 도착해요.
FAQ
Why does Korean use two number systems for one clock time? Historical layering: hours kept the old native counting, while 분 (minute) arrived later with sino vocabulary. Don’t try to reason it out — drill it as one chunk: 시 takes native, 분 takes sino. Duration works the same way: 한 시간 = one hour.
How do I say 11 o’clock and 12 o’clock? 열한 시 and 열두 시 — compound numbers change their last piece (열하나→열한, 열둘→열두). And speech stops there: Koreans don’t count hours 13–24 out loud; they flip to 오전/오후 instead, so you never need anything above 열두 시 in conversation.
Is 세 시 반 or 세 시 삼십 분 more natural? Both are fully natural; 반 (half) is shorter, so it wins in casual speech — like English “half past three”. There is no special word for quarter past: just say 십오 분.
Next: Korean dates and months. Previous: Native numbers and counters. Full path: curriculum hub.