Korean does not have one set of numbers, it has two, and mixing them up is one of the most common mistakes beginners make. The native Korean system (hana, dul, set) and the Sino-Korean system (il, i, sam) exist side by side, each with its own job. Native Korean numbers count objects, people, hours, and age. Sino-Korean numbers handle dates, money, minutes, addresses, and phone numbers. Neither system is optional, and neither is "more correct." This guide lays out both systems in full, from 1 to 20 and beyond, with a clear breakdown of exactly which one to reach for.
Short answer: Korean uses native Korean numbers (hana, dul, set) for counting objects, people, hours, and age, and Sino-Korean numbers (il, i, sam) for dates, money, minutes, and phone numbers. Native Korean numbers stop at 99, so anything 100 and above always uses Sino-Korean.
The split goes back a long way. Native Korean numbers come from the language's own roots and were in use long before Korea had a writing system of its own. Sino-Korean numbers arrived later, borrowed from Chinese numerals as Chinese characters spread through Korea for government records, scholarship, and trade over many centuries.
Rather than one system pushing the other out, both stuck around, and Korean speakers gradually settled into a habit of using each one for particular jobs. That division is not random or optional today, it is simply how the language works, in the same way English keeps both "first" and "1st" but uses them in different contexts.
The good news for learners is that you are not learning two random word lists. Once you know the pattern for each system, most of the higher numbers build logically from a small set of building blocks, so the real task is learning which system a given situation calls for, more than memorizing endless new words.
Use this system for counting objects and people, telling someone your age, and saying the hour when telling time.
| Number | Hangul | Pronunciation |
|---|---|---|
| 1 | 하나 | hana (hah-nah) |
| 2 | 둘 | dul (dool) |
| 3 | 셋 | set |
| 4 | 넷 | net |
| 5 | 다섯 | daseot (dah-suht) |
| 6 | 여섯 | yeoseot (yuh-suht) |
| 7 | 일곱 | ilgop (il-gop) |
| 8 | 여덟 | yeodeol (yuh-duhl) |
| 9 | 아홉 | ahop (ah-hop) |
| 10 | 열 | yeol (yuhl) |
| 11 | 열하나 | yeol-hana |
| 12 | 열둘 | yeol-dul |
| 13 | 열셋 | yeol-set |
| 14 | 열넷 | yeol-net |
| 15 | 열다섯 | yeol-daseot |
| 16 | 열여섯 | yeol-yeoseot |
| 17 | 열일곱 | yeol-ilgop |
| 18 | 열여덟 | yeol-yeodeol |
| 19 | 열아홉 | yeol-ahop |
| 20 | 스물 | seumul (suh-mool) |
Notice the pattern from 11 onward: it is just yeol (ten) followed by the number 1 through 9. Eleven is literally "ten one," nineteen is "ten nine." That same logic carries all the way through the native system's range, which stops at 99.
A quirk worth knowing: when native numbers sit directly in front of a counting word, four of them change slightly. Hana becomes han, dul becomes du, set becomes se, and net becomes ne. So "one dog" is han mari (using the counter for animals), not hana mari. This trips up a lot of learners early on, but it only affects those first four numbers.
Use this system for dates, prices, phone numbers, addresses, and minutes when telling time. It is also what you will use for math and any number above 99, since native Korean does not go that high.
| Number | Hangul | Pronunciation |
|---|---|---|
| 1 | 일 | il (eel) |
| 2 | 이 | i (ee) |
| 3 | 삼 | sam |
| 4 | 사 | sa (sah) |
| 5 | 오 | o (oh) |
| 6 | 육 | yuk (yook) |
| 7 | 칠 | chil (cheel) |
| 8 | 팔 | pal |
| 9 | 구 | gu (goo) |
| 10 | 십 | sip (ship) |
| 11 | 십일 | sip-il |
| 12 | 십이 | sip-i |
| 13 | 십삼 | sip-sam |
| 14 | 십사 | sip-sa |
| 15 | 십오 | sip-o |
| 16 | 십육 | sim-nyuk |
| 17 | 십칠 | sip-chil |
| 18 | 십팔 | sip-pal |
| 19 | 십구 | sip-gu |
| 20 | 이십 | i-sip |
This system is closer to how Chinese numerals build, and it is more mechanical than the native system. Ten is sip, so eleven is sip-il, "ten one," twelve is sip-i, "ten two," and so on up to nineteen. Twenty is i-sip, "two ten." Once you have 1 through 10 memorized, the teens and the tens both follow directly from them, with very few exceptions to learn.
This is the part that actually trips learners up, not the vocabulary itself. Here is a practical breakdown of what calls for which system:
Telling time is the one place both systems show up in a single sentence: the hour uses native Korean, the minute uses Sino-Korean. Three thirty five becomes se si (three o'clock, native) sam-sip-o bun (thirty five minutes, Sino-Korean). It looks strange at first, but it becomes automatic with practice, in the same way English speakers do not think twice about switching between "third" and "3" mid-sentence.
Age is a useful anchor point, since it only ever uses native Korean, paired with the counter word sal. A twenty five year old says seumul-daseot sal, not the Sino-Korean equivalent. If you remember that age always takes native numbers, it becomes easier to sort the rest of the categories from there.
Both systems keep building predictably past 20. In native Korean, the tens each get their own standalone word rather than being built from smaller pieces: seoreun (30), maheun (40), swin (50), yesun (60), ilheun (70), yeodeun (80), aheun (90). These are worth learning as a set, since they do not follow an obvious pattern from the numbers 1 through 9 the way the Sino-Korean tens do.
Sino-Korean, by contrast, stays completely mechanical: sam-sip (30, "three ten"), sa-sip (40, "four ten"), o-sip (50), and so on, all the way up. Once native Korean hits 99 at aheun-ahop, it simply stops being used, and everything from 100 upward, baek, switches to Sino-Korean permanently, including large numbers used for money, population figures, and dates.
One structural note that surprises a lot of learners: Korean groups large numbers in units of ten thousand (man), following the Chinese numbering tradition, rather than grouping by thousands the way English does. That is why a number like one million is not expressed the way English speakers might expect, and why Korean prices in the tens of thousands can look unfamiliar written out until the man-based grouping clicks.
The single biggest mistake is using the wrong system for the situation, most often defaulting to Sino-Korean everywhere because it is learned first (it is short and needed immediately for phone numbers), and then accidentally using it to state an age or count objects. Age and object-counting always want native Korean.
The second common mistake is forgetting that hana, dul, set, and net change form in front of a counting word, becoming han, du, se, and ne. Saying hana mari instead of han mari is a small error, but a frequent one, since it is easy to forget the shortened forms exist until you have used them a few times.
A smaller but persistent trip-up is Korean's minute measurement always sitting in Sino-Korean even when the hour right next to it is in native Korean, in the same sentence. It feels inconsistent to a beginner used to a single number system, but it is completely standard and just needs repetition to feel natural.
Rote memorization of two number lists rarely sticks on its own, mostly because the systems get jumbled together without a clear sense of when each one applies. What tends to work better is practicing each system inside the situation it actually belongs to: counting objects and stating ages with native Korean, reading out prices and dates with Sino-Korean, rather than drilling both lists side by side in the abstract.
This is one of the reasons a game-based approach can help with something like this. Noun Town attaches vocabulary to a 3D scene, so a number learned while counting objects in a market stall gets reinforced in the context it is actually used in, with native speaker audio and spaced repetition bringing it back for review at the right intervals rather than all at once.
Want to learn Korean vocabulary in context instead of off a flat list?
Try Noun Town on SteamKorean has a native Korean system, with its own original words such as hana, dul, set, and a Sino-Korean system borrowed from Chinese numerals centuries ago, such as il, i, sam. Both are used every day, but for different purposes, and a fluent speaker switches between them automatically depending on what is being counted.
Native Korean numbers are used to count objects, people, and hours, and to state someone's age. If you are counting apples, ordering two coffees, or saying you are twenty five years old, you reach for the native system: hana, dul, set, and so on.
It depends which system you need. In native Korean, six is yeoseot, used for counting six objects or six years old. In Sino-Korean, six is yuk, used for the sixth of the month, six minutes, or a phone number containing a six. Both are correct, they just answer different questions.
Native Korean numbers only go up to 99. Once you reach 100, Korean switches to the Sino-Korean word baek, and stays in the Sino-Korean system for every number from there upward, including dates, prices, and large quantities.
Native Korean numbers predate written Korean and come from the language's own roots. Sino-Korean numbers were adopted from Chinese numerals as Chinese characters spread through Korea for administration, scholarship, and record keeping over many centuries. Rather than one system replacing the other, both survived side by side, each settling into its own set of everyday uses.
Korean time uses both systems in the same sentence. The hour is said with native Korean numbers, for example se si for three o'clock, while the minutes are said with Sino-Korean numbers, for example sam-sip-o bun for thirty five minutes. So three thirty five is se si sam-sip-o bun.
Not all at once. Most learners start with Sino-Korean 1 to 10, since it is short, regular, and needed immediately for phone numbers and prices, then add native Korean 1 to 10 once that feels solid, since it is needed for age and counting objects. Trying to learn both in one sitting is where most confusion starts.
The two systems add a genuine extra step compared to a language with one number system, but each system on its own is quite regular. Sino-Korean in particular follows a clean, predictable pattern once you know 1 to 10, since 11 is simply ten one, 20 is two ten, and so on.
Zero in Korean is yeong or gong, both Sino-Korean. Gong is the form most commonly heard when reading out phone numbers or ID numbers digit by digit.
Yes, particularly for a two-system problem like this one, since a game can attach native Korean numbers to scenes about counting objects or ages, and Sino-Korean numbers to scenes about prices or dates, reinforcing which system belongs where through repeated context rather than a flat list.