If you're learning Korean, numbers may seem simple at first.
One is 하나 (hana), two is 둘 (dul), and three is 셋 (set). Easy enough.
Then you hear a Korean say:
삼 분 (sam bun) — three minutes
Wait—shouldn't three be 셋 (set)?
And it gets even more confusing when you hear:
세 시 삼십 분 (se si samsip bun) — 3:30
The number three appears twice in the same expression, but first it's 세 (se) and then it's 삼 (sam).
The reason is simple: Korean has two different number systems, and Koreans switch between them depending on what they're talking about.
Two Ways to Say Numbers in Korean
Korean uses two number systems:
Native Korean numbers: 하나, 둘, 셋, 넷…
Sino-Korean numbers: 일, 이, 삼, 사…
Both are used every day. The tricky part isn't learning that two systems exist. It's knowing when to use which one.
Native Korean Numbers: 하나, 둘, 셋
Here are some basic Native Korean numbers:
하나 (hana) — one
둘 (dul) — two
셋 (set) — three
넷 (net) — four
다섯 (daseot) — five
여섯 (yeoseot) — six
일곱 (ilgop) — seven
여덟 (yeodeol) — eight
아홉 (ahop) — nine
열 (yeol) — ten
스물 (seumul) — twenty
Native Korean numbers are commonly used with many counters, especially when counting people and everyday objects. They're also used for age and the hour when telling time.
For example:
사과 세 개 (sagwa se gae) — three apples
사람 두 명 (saram du myeong) — two people
스물다섯 살 (seumuldaseot sal) — 25 years old
세 시 (se si) — 3 o'clock
But you may have noticed something.
Why is it 세 개, rather than 셋 개?
하나 Becomes 한, 둘 Becomes 두
Some Native Korean numbers change form when they come directly before a counter.
하나 → 한
둘 → 두
셋 → 세
넷 → 네
스물 → 스무
So Koreans say:
한 개 (han gae) — one thing
두 명 (du myeong) — two people
세 시 (se si) — three o'clock
네 살 (ne sal) — four years old
스무 살 (seumu sal) — 20 years old
That's why 세 개 sounds natural, while 셋 개 does not.
You don't need to overthink the grammar behind this at first. It's much easier to pick up these combinations as complete expressions.
Sino-Korean Numbers: 일, 이, 삼
The second system is Sino-Korean.
These numbers come from Chinese numerals that became deeply incorporated into Korean.
일 (il) — one
이 (i) — two
삼 (sam) — three
사 (sa) — four
오 (o) — five
육 (yuk) — six
칠 (chil) — seven
팔 (pal) — eight
구 (gu) — nine
십 (sip) — ten
Sino-Korean numbers are commonly used for money, dates, minutes, phone numbers, addresses, measurements, calculations, and larger numbers.
For example:
삼천 원 (samcheon won) — 3,000 won
삼월 (samwol) — March
이천이십육 년 (icheonisipyuk nyeon) — 2026
삼 분 (sam bun) — three minutes
이십오 분 (isibo bun) — 25 minutes
And this is where Korean numbers start to surprise beginners.
You say:
세 시 (se si) → 3 o'clock
but:
삼 분 (sam bun) → 3 minutes
They're both telling time and they're both the number three, but Korean uses different number systems.
We Even Switch Systems in the Middle of Telling Time
As a Korean, I don't mentally think, “Now I need a Native Korean number. Now I need a Sino-Korean number.”
If someone asks me the time, something like:
세 시 삼십 분 (se si samsip bun)
just comes out naturally.
But look at what's happening:
세 시 → 3 o'clock → Native Korean
삼십 분 → 30 minutes → Sino-Korean
We've switched number systems in the middle of saying one time.
It was only when I started explaining Korean to non-Koreans that I realized how strange this must sound to a learner.
To Koreans, though, 세 시 삼십 분 feels no stranger than “three thirty” does in English.
The Same Number Changes Depending on What You're Talking About
This is probably the most useful idea to remember.
| What you're saying | Korean |
|---|---|
| 3 people | 세 명 (se myeong) |
| 3 things | 세 개 (se gae) |
| 3 o'clock | 세 시 (se si) |
| 3 minutes | 삼 분 (sam bun) |
| 3,000 won | 삼천 원 (samcheon won) |
| March | 삼월 (samwol) |
| 23 years old | 스물세 살 (seumulse sal) |
So instead of asking:
“How do I say three in Korean?”
a better question is:
“What am I using the number three for?”
That will often tell you which system you need.
Why Does Korean Have Two Number Systems?
You don't need a history lesson every time you want to buy three apples, but knowing the basic reason can make the system less mysterious.
Native Korean numbers developed within the Korean language itself.
Sino-Korean numbers came from Chinese numerals and became part of Korean through centuries of linguistic and cultural influence.
Rather than one system replacing the other, both remained and gradually took on different roles.
That's why learning:
1 = 하나
2 = 둘
3 = 셋
is only half the story.
You also need:
1 = 일
2 = 이
3 = 삼
What About Bigger Numbers?
Native Korean numbers are generally used only up to 99 in modern Korean, and even within that range, the situation determines which system you use.
For larger numbers, Sino-Korean takes over.
This is also the system used for number units such as:
백 (baek) — 100
천 (cheon) — 1,000
만 (man) — 10,000
For example:
삼백 (sambaek) — 300
삼천 (samcheon) — 3,000
삼만 (samman) — 30,000
If you're dealing with prices in Korea, you'll become familiar with Sino-Korean numbers very quickly.
Korean Numbers: A Practical Cheat Sheet
If all these rules are starting to blur together, don't worry. For everyday Korean, this chart covers many of the situations you'll run into most often.
| Situation | Number system | Example |
|---|---|---|
| People | Native Korean | 세 명 — 3 people |
| Things | Native Korean | 세 개 — 3 things |
| Age | Native Korean | 스물세 살 — 23 years old |
| Hours | Native Korean | 세 시 — 3 o'clock |
| Minutes | Sino-Korean | 삼 분 — 3 minutes |
| Money | Sino-Korean | 삼천 원 — 3,000 won |
| Dates | Sino-Korean | 삼월 삼일 — March 3 |
| Years | Sino-Korean | 이천이십육 년 — 2026 |
| Phone numbers | Sino-Korean | 공일공… — 010… |
| Addresses | Sino-Korean | 삼백이십 번 — No. 320 |
| Measurements | Sino-Korean | 삼 킬로미터 — 3 km |
| Large numbers | Sino-Korean | 삼만 — 30,000 |
And remember these five Native Korean number changes:
하나 → 한
둘 → 두
셋 → 세
넷 → 네
스물 → 스무
If you need an even quicker memory trick:
People, things, age, hours → usually Native Korean
Money, dates, minutes, phone numbers → usually Sino-Korean
It's not a rule that covers every possible situation, but it's a practical place to start.
You may also enjoy: Why Do Koreans Ask Your Age So Soon After Meeting You? A Native Korean Explains
Age comes up surprisingly often in Korean conversation because it can affect how people address and interact with one another. If you're curious why, read why age is so important in Korea.
Native Korean's Tip: Learn the Combination, Not Just the Number
If you're just starting out, I wouldn't try to memorize two giant number lists and then work out the rules every time you speak.
Instead, learn the combinations you actually use:
세 시 (se si) — 3 o'clock
삼 분 (sam bun) — 3 minutes
세 명 (se myeong) — 3 people
세 개 (se gae) — 3 things
삼천 원 (samcheon won) — 3,000 won
At first, you may have to stop and think:
Was it 셋 or 삼?
That's completely normal.
But after hearing combinations like 세 시, 삼 분, and 삼천 원 enough times, the difference starts to sink in.
Eventually, instead of translating each number in your head, you'll simply pick up which form goes with which situation.
And that's when Korean numbers start to feel much easier than they did at first.
You may also enjoy: Why Are "Yes" and "No" So Confusing in Korean? A Native Korean Explains
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