Why I Couldn't Count in Korean for 6 Months (And the Numbering System Nobody Explained)

The Menu I Couldn't Read

I thought I knew Korean numbers.

I'd memorized 1-10. I could count to 100. I felt pretty good about myself.

Then I walked into a Korean restaurant in Seoul, opened the menu, and saw prices like "5,000원" and "12,000원."

I knew 5 was "오" (o) and 12 was... wait, was it "엘리" or "십이"? And why did the "원" (won) sound different when the cashier said it?

I pointed at the menu and said "이거 주세요" (this please), hoping for the best. I got lucky. But I realized something that day: I didn't actually know how numbering in Korean worked.

Here's what took me months to figure out: Korean doesn't just have one way to count. It has two complete number systems, and using the wrong one marks you as a foreigner immediately.

This isn't a list of numbers to memorize. It's what I wish someone had told me before I embarrassed myself at that restaurant.

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The Two-System Reality

Most languages have one set of numbers. Korean has two.

Native Korean numbers (하나, 둘, 셋, 넷...) developed in Korea over thousands of years. Sino-Korean numbers (일, 이, 삼, 사...) came from Chinese influence.

Neither is "wrong." Neither is optional. You need both, and using the right one in the right situation is what separates fluent speakers from beginners.

The simple rule that took me months to internalize:

• Native Korean = counting things, people, age, hours
• Sino-Korean = money, dates, addresses, minutes, numbers 100+

But simple rules have exceptions. And context matters more than any rule.

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System 1: Native Korean Numbers (하나, 둘, 셋...)

This is the "pure" Korean counting system—the one that existed before Chinese influence. It feels more natural to Korean speakers when counting physical objects.

1-10 in Native Korean:

• 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)

When you use Native Korean:

Counting objects (with counters):

• 한 개 (han gae) = one thing
• 두 명 (du myeong) = two people
• 세 번 (se beon) = three times

Age:

• 스물 한 살 (seumul han sal) = 21 years old
• 서른 살 (seoreun sal) = 30 years old

Hours (when telling time):

• 한 시 (han si) = 1 o'clock
• 두 시 (du si) = 2 o'clock

My mistake: I tried to use Native Korean for everything because it felt more "authentic." I told a cashier my change should be "열 원" (yeol won) instead of "십 원" (sip won). She looked confused until I corrected myself.

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System 2: Sino-Korean Numbers (일, 이, 삼, 사...)

These numbers came from Chinese and are used for more formal, abstract, or large quantities. They're also the numbers used in writing (Arabic numerals are read with these pronunciations).

1-10 in Sino-Korean:

• 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)

The pattern for larger numbers:

• 11: 십일 (sip-il) = 10 + 1
• 20: 이십 (i-sip) = 2 × 10
• 100: 백 (baek)
• 1,000: 천 (cheon)
• 10,000: 만 (man)

When you use Sino-Korean:

Money:

• 오천 원 (o-cheon won) = 5,000 won
• 만 이천 원 (man i-cheon won) = 12,000 won

Dates:

• 일월 이일 (il-wol i-il) = January 2nd
• 삼월 십오일 (sam-wol sip-o-il) = March 15th

Minutes:

• 오십 분 (o-sip bun) = 50 minutes
• 십오 분 (sip-o bun) = 15 minutes

Phone numbers:

• 공일공... (gong-il-gong) = 010...

Numbers 100 and above: Native Korean only goes up to 99. For 100+, you must use Sino-Korean.

My mistake: I tried to say I was "백 살" (baek sal = 100 years old) using the Sino-Korean number with the Native Korean counter. It should be "백 세" (baek se) or you switch to "100세" in formal contexts. But for age, even that sounds odd—usually you just say "백 살" when someone actually turns 100 (a huge celebration in Korea).

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The Overlap Zone: When Both Work (And When They Don't)

Here's where it gets confusing: some situations allow both systems, but with different nuances.

Months:

• Native: 한 달 (han dal) = one month (duration)
• Sino: 일 개월 (il gae-wol) = one month (formal/counting)

Years:

• Native: 일 년 (il nyeon) = one year (sometimes)
• Sino: 일 년 (il nyeon) = one year (same pronunciation, different origin)

Actually, for years, it's more complicated. "한 해" (han hae) uses Native, but "일 년" uses Sino. Koreans switch between them depending on context.

My confusion: I asked someone "몇 살이에요?" (how old are you?) and they said "스물셋" (seumulset = 23). Then I asked "몇 년 동안?" (for how many years?) and they said "삼 년" (sam nyeon = 3 years). Both were correct, but I couldn't figure out why one used Native and the other used Sino.

The answer: Age uses Native (살). Years (as a unit of time) use Sino (년).

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The Counters: Where Native Korean Gets Complicated

Native Korean numbers change when combined with counters. This is the part that frustrated me the most.

The basic number: 하나 (hana) = one

With counters, it changes:

• 한 개 (han gae) = one thing
• 한 명 (han myeong) = one person
• 한 번 (han beon) = one time
• 한 마리 (han mari) = one animal
• 한 병 (han byeong) = one bottle

Numbers 1, 2, 3, 4, and 20 change form:

Basic	With Counters	Example
하나	한	한 개
둘	두	두 명
셋	세	세 번
넷	네	네 마리
스물	스무	스무 살

My frustration: I memorized "하나, 둘, 셋" and then couldn't understand why people said "한 개, 두 개, 세 개." Nobody explained that the numbers change form when combined with counters.

The pattern isn't random:

• 1-4 and 20 lose their final consonant before a counter
• This makes pronunciation smoother
• It becomes automatic with practice

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Real Situations: What I Do Now

After months of confusion, here's my practical approach:

At a restaurant:

• Prices: Sino-Korean (이천 원 = 2,000 won)
• Ordering "one portion": Native with counter (일 인분... wait, no, that's Sino. Actually, it's 한 인분 using Native 변형)

Actually, even this is messy. Some restaurant terms use Sino, some use Native. I usually just point and say "이거 하나 주세요" (this, one please) using Native 하나.

Telling time:

• Hours: Native (한 시, 두 시)
• Minutes: Sino (십 분, 이십 분)
• "What time is it?" = "몇 시예요?" (myeot si-ye-yo) using Native 몇

Asking age:

• "몇 살이에요?" (myeot sa-ri-e-yo) using Native 몇
• Answering: Native (스물 하나 살)

Phone numbers:

• All Sino-Korean, even zero becomes 공 (gong)

Counting things:

• Native numbers with appropriate counters
• If I don't know the counter, I use 개 (gae) as a generic "thing" counter

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The Number 18 Problem (And Other Cultural Notes)

While learning Korean numbers, I stumbled onto something weird: the number 18 is slightly taboo.

십팔 (sip-pal), when said quickly, sounds like a Korean swear word. Some buildings skip the 18th floor. It's not a huge deal—Koreans still use 18 all the time—but it's something to be aware of.

Other cultural number notes:

4 (사, sa): Sounds like the Chinese word for "death" (死). Some buildings skip 4th floor, but this is less common in Korea than in China or Japan.

Lucky numbers: 7 (칠, chil) is considered lucky in Korea, influenced by Western culture. 8 (팔, pal) is also positive.

Milestone birthdays: 60 (환갑, hwangap), 70 (고희, gohui), and 80 (산수, sansu) are traditionally significant, though modern Koreans often celebrate Western-style birthdays instead.

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FAQ: Real Questions About Numbering in Korean

Why does Korean have two number systems?

Korean uses Native Korean numbers (하나, 둘, 셋) for counting objects, people, age, and hours. It uses Sino-Korean numbers (일, 이, 삼) for dates, money, addresses, minutes, and numbers above 99. This dual system developed because Sino-Korean numbers were imported from China, while Native numbers are purely Korean.

When do I use Native Korean numbers vs Sino-Korean numbers?

Use Native Korean (하나, 둘, 셋) for: counting objects/people with counters (한 개, 두 명), age (스물 한 살), hours (한 시). Use Sino-Korean (일, 이, 삼) for: dates (일월 이일), money (오천 원), addresses (삼십 번지), minutes (오십 분), and numbers 100+.

How do you say 'one' in Korean?

Korean has two words for 'one': 하나 (hana) is Native Korean, used for counting objects and age. 일 (il) is Sino-Korean, used for dates, money, and formal counting. For 'one thing,' you'd say '한 개' (han ga) using the Native number with a counter.

Why is 18 a bad number in Korean?

The number 18 (십팔, ship-pal) sounds similar to a Korean swear word when pronounced quickly. Many buildings skip the 18th floor, similar to how some Western buildings skip 13. However, in most contexts, 18 is just a number—this is just something to be aware of.

Do Koreans use Arabic numerals or Korean characters for numbers?

Koreans use Arabic numerals (1, 2, 3) in most daily writing—prices, phone numbers, dates. However, numbers are often read aloud using Sino-Korean or Native Korean pronunciation depending on context. Learning both systems is essential for understanding spoken Korean.

Is numbering in Korean difficult for English speakers?

The concept of dual number systems is unusual for English speakers, but each system individually is straightforward. The challenge is remembering which system to use in which context. With practice and exposure to real Korean content, it becomes natural. Most learners find they need about 2-4 weeks of consistent practice to feel comfortable.

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Learn Korean Numbers in Real Context

I memorized flashcards for weeks and still couldn't use numbers naturally. Then I started watching Korean variety shows, and something clicked.

I saw a celebrity say "서른 살" (seoreun sal = 30 years old) and realized that was Native Korean. I heard a chef say "오천 원" (o-cheon won = 5,000 won) and recognized the Sino-Korean pattern.

That's how numbering in Korean actually sticks—not through memorization, but through hearing numbers used naturally in context.

How Lingoku helps:

• Watch Korean YouTube videos, variety shows, or dramas
• When someone mentions a number, Lingoku highlights it
• See the context: Are they talking about money? Age? Time? Counting objects?
• Learn which number system to use naturally—by seeing when Koreans switch between them

Example: You're watching a Korean mukbang (eating show). The host says "한 개 먹을게요" (I'll eat one) using Native Korean with a counter. Later, they mention a price using Sino-Korean numbers. Lingoku explains the difference, showing you how Koreans actually use both systems in real conversations.

Ready to hear how Koreans actually count in real life? Install Lingoku and start learning from authentic Korean content today.

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Last updated: 2026-03-03