If you’ve started learning Korean, you’ve probably hit a wall the moment numbers came up. That’s because Korean doesn’t have one number system — it has two, running side by side. I’m a native Korean speaker, and I’ll be honest: even I still mix them up sometimes, and I’ve googled an old Sino-Korean word more than once just to make sure I understood what it meant.
Why Korean Has Two Number Systems
Korean uses a huge number of Sino-Korean words — vocabulary borrowed from Chinese characters (한자) centuries ago — alongside pure, native Korean words (고유어). Numbers are no exception. Over time, both systems survived, and Koreans use them in different situations depending on what’s being counted. For a foreign learner, this means you can’t just memorize “one set of numbers” and be done — you have to learn which system applies where, and that’s genuinely one of the trickier parts of learning Korean.
Sino-Korean Numbers (한자어 숫자)
These come from Chinese characters and are used for things like phone numbers, money, dates, minutes, and math.
- 1 = 일 (il)
- 2 = 이 (i)
- 3 = 삼 (sam)
- 4 = 사 (sa)
- 5 = 오 (o)
- 6 = 육 (yuk)
- 7 = 칠 (chil)
- 8 = 팔 (pal)
- 9 = 구 (gu)
- 10 = 십 (sip)
Native Korean Numbers (고유어 숫자)
These are used for counting objects, people, hours (not minutes), and age.
- 1 = 하나 (hana)
- 2 = 둘 (dul)
- 3 = 셋 (set)
- 4 = 넷 (net)
- 5 = 다섯 (daseot)
- 6 = 여섯 (yeoseot)
- 7 = 일곱 (ilgop)
- 8 = 여덟 (yeodeol)
- 9 = 아홉 (ahop)
- 10 = 열 (yeol)
Which One Do You Use When?
This is the part that trips up almost every learner, because the “same” number changes shape depending on what it’s attached to:
- Counting age: 한 살 (han-sal) — native number + 살
- Counting objects: 한 개 (han-gae) — native number + 개 (item counter)
- Telling time (hour): 한 시 (han-si) — native number
- Telling time (minute): 일 분 (il-bun) — Sino-Korean number
- Phone numbers, prices, dates: always Sino-Korean — 일, 이, 삼…
Notice how “one” alone shows up as 하나, 한, or 일 depending entirely on context. That shape-shifting is exactly what makes this hard to pick up from a textbook — it’s something you absorb through repeated exposure, not through memorizing a rule once.
Even Native Koreans Get Confused
I want to be honest about something: this isn’t just a “foreigner problem.” Korean has so many old Sino-Korean words that even I, a native speaker, sometimes hear one and have no idea what it means — I’ll pull out my phone and search it right there. So if the native/Sino-Korean split feels overwhelming at first, that’s a completely normal reaction, not a sign you’re bad at this.
Quick Tips for Learners
- Don’t try to memorize the “rule” first — learn a handful of full phrases (ordering “one coffee,” saying you’re “26 years old,” telling someone it’s “3 o’clock”) and the pattern will start to feel natural on its own.
- Counters matter as much as the number itself — 개, 명, 살, 시 all pair with native numbers, while 분, 월, 원 pair with Sino-Korean ones.
- If you only have time to master one system first, start with Sino-Korean — it’s simpler, used for money and phone numbers, and you’ll need it constantly as a traveler.