Korean uses two number systems: Sino-Korean for dates, money, minutes, phone numbers, and any count at 100 or above, and Native Korean for counting people, animals, and everyday items up to 99, plus age and hours. This guide breaks down both systems with charts, counter pairings, and short drills so you can switch between them without pausing to think.
TL;DR:
- Native Korean numbers are used for counting objects, people under 100, and expressing age or hours, while Sino-Korean numbers handle dates, money, minutes, phone numbers, and counts above 100.
- Large numbers are grouped by units of 10,000 with 만 and 억, not thousands, which differs from English and affects how prices and salaries are read.
- Time expressions combine native Korean for hours with Sino-Korean for minutes, requiring learners to switch systems mid-sentence for natural speech.
- Counting with counters involves attaching the correct measure word, with native numbers defaulting for objects, and Sino-Korean for units, prices, or ranks; contractions also improve fluency.
- Fluency improves fastest through daily practice, real conversation correction, and using numbers in context rather than solely memorizing charts or rules.
Table of Contents
- Number charts: Sino-Korean and Native Korean side by side
- When to use each system: a simple decision rule
- Counters: the measure words every number needs
- Telling time: when hours and minutes switch systems
- Large numbers: how 만 and 억 organize big counts
- Fixing the mistakes that give learners away
- Daily drills to build number fluency fast
- What learners actually struggle with, and what helps
- Practice these systems in guided conversation classes
- Where these rules and charts come from
- Sources
- FAQ
Number charts: Sino-Korean and Native Korean side by side
The fastest way to learn both systems is to see them next to each other. Sino-Korean numbers come from Chinese characters and build predictably: once you know 1 through 10, you can construct almost any number by combining those blocks. Native Korean numbers have their own roots and only go up to 99 in standard use, which is one reason they feel trickier at first.
Teens in both systems just stack the ten plus the unit: 십일 (11) is literally “ten one,” and 열하나 (11) is “ten-and-one” in native form. The same logic carries through the tens: 이십삼 (23) and 스물셋 (23) follow the same build pattern as their tens-place counterparts.
Two pronunciation traps catch most learners early. First, zero has two forms: 영 (yeong) is used in math and formal contexts, while 공 (gong) is common in phone numbers and sports scores. Second, native numbers stop at 99 for everyday counting, so once you cross into the hundreds, Sino-Korean takes over automatically, a pattern this guide revisits with large numbers below. If you want extra repetition on the basics before moving further, this breakdown of numbers 1 through 10 in both systems is a solid starting point.
When to use each system: a simple decision rule
Most learners overcomplicate this. The two systems split along fairly predictable lines, and once you see the pattern, the guesswork mostly disappears.
Sino-Korean covers:
- Dates, including year, month, and day.
- Money and prices, from a cup of coffee to a monthly salary.
- Minutes when telling time, phone numbers, and addresses.
- Any number 100 or higher, in almost every context.
- Ordinal numbers in many formal or sequential contexts, like floor numbers or exam scores.
Native Korean covers:
- Counting physical objects and people, as long as the count stays under 100.
- Age when spoken aloud in conversation.
- Hours when telling time.
- Frequency in everyday phrases, like how many times you have done something.
A heuristic that sticks: if you could point at something and tally it on your fingers, native Korean is the default. If the number describes a unit, a measurement, a rank, or a date, Sino-Korean takes over. This split reflects how Korean numerals are generally applied: Sino-Korean is used for dates, money, minutes, phone numbers, and numbers 100 and above, while Native Korean handles counting objects, people, animals, age in speech, and hours.
Even with the heuristic, a few situations need to be memorized rather than reasoned out. Telling time mixes both systems within a single phrase, which trips up even learners who have the basic rule down. Counting money always defaults to Sino-Korean regardless of the amount, so a 3,000 won item is never counted with native numbers. And age, while spoken in native Korean in conversation, switches to Sino-Korean in formal or written contexts like legal documents. Treat these as fixed phrases to practice rather than puzzles to solve from first principles.
Counters: the measure words every number needs
Korean rarely attaches a number directly to a noun. Instead, you use the pattern noun plus number plus counter, similar to saying “two cups of coffee” instead of “two coffee.” The counter tells the listener what kind of thing is being counted, and most counters pair with one number system by default.
Most counters for countable, physical things default to native numbers, while counters tied to units, rankings, or money default to Sino-Korean. When in doubt, treat 개, 명, and 잔 as your safe starting set since they cover objects, people, and drinks, which account for a large share of daily conversation.
A few politeness notes matter here too:
- Use 분 instead of 명 when counting people you want to address respectfully, such as customers or elders.
- 개월 counts duration in months, while a calendar month (like “in March”) uses a completely different word, 월.
- Floors above the first are almost always read with Sino-Korean, even in casual speech.
For a deeper list of which counters to prioritize, this counters guide ranks the ten most useful ones for new learners.
Telling time: when hours and minutes switch systems
Korean time expressions are the clearest place where both systems appear in a single sentence, and getting this right is one of the most visible signs of fluency. The rule is fixed: hours use native Korean numbers plus 시, and minutes use Sino-Korean numbers plus 분. This hybrid pattern is well documented in guidance on pure Korean versus Sino-Korean numbers, which notes that learners must switch systems mid-sentence to sound natural.
Try reading these aloud, hour first in native form, then minutes in Sino form:
- 3:15 is 세 시 십오 분 (se si sibo bun).
- 12:30 is 열두 시 삼십 분 (yeoldu si samsip bun), or 열두 시 반 using 반 for “half.”
- 7:05 is 일곱 시 오 분 (ilgop si o bun).
- 9:45 is 아홉 시 사십오 분 (ahop si sasibo bun).
Notice that 반 (half) can replace “thirty minutes” the same way English speakers say “half past seven.”
Pro Tip: Drill time expressions as fixed phrases rather than building them from the rule each time. Your mouth will catch up faster than your grammar brain.
Large numbers: how 만 and 억 organize big counts
Korean groups large numbers in units of 10,000 rather than 1,000, which is a structural difference from English that trips up even advanced learners. The key units are 만 (10,000) and 억 (억), and Korean numerals group consistently in these 10,000-based blocks rather than the thousand-based grouping used in English.
One useful anchor: Korean numerals use 만 and 억 as the primary grouping units above 9,999, which means a number like 50,000 is read as 오만 (5 x 10,000), not as fifty separate thousands.
| Number | Korean reading | Romanization |
|---|---|---|
| 10,000 | 일만 (often just 만) | il-man |
| 50,000 | 오만 | oman |
| 100,000 | 십만 | simman |
| 백만 | 백만 | baekman |
| 억 | 일억 (often just 억) | ileok |
Prices and salaries follow this grouping directly. A monthly salary of 3,000,000 won is read as 삼백만 원 (sambaekman won), combining the hundred, the 만 block, and the currency counter 원. Once you are working with any value at or above 100, Sino-Korean is the only system in play, and formal listings like prices, population counts, and statistics stick to it without exception.
Fixing the mistakes that give learners away
Three errors show up constantly in beginner speech, and each has a clean fix.
- Using Sino-Korean with a native-preferring counter, like saying 오 명 instead of 다섯 명 for five people, is the single most common mistake.
- Using native numbers for minutes or money, such as saying 다섯 분 instead of 오 분 for five minutes, reverses the time rule.
- Forgetting the bound forms before counters, which makes speech sound stiff or overly formal.
Native numbers 1 through 4, plus 20, contract into shorter bound forms when they sit directly before a counter: 하나 becomes 한, 둘 becomes 두, 셋 becomes 세, 넷 becomes 네, and 스물 becomes 스무 specifically before 살 (age) or similar counters. These contraction rules are frequent and high-impact for natural speech, so skipping them is one of the fastest ways to sound like you are reading from a textbook. Compare 한 개 (one item) to the uncontracted 하나 개, which native speakers never use, or 스무 살 (twenty years old) to the incorrect 스물 살.
For phone numbers, native speakers often read digits individually rather than as full numbers, and mixing in native-style pronunciation for clarity on certain digits is common in casual speech. Practicing with real phone numbers, written down and read aloud slowly, builds this instinct faster than any grammar explanation. For more on sounding natural with tricky sounds, see this guide to pronunciation beyond basic romanization.
Pro Tip: When you catch yourself hesitating between systems, default to native for anything you can count on your fingers, and Sino for anything with a price tag or a clock attached.
Daily drills to build number fluency fast
Short, repeated practice beats long study sessions for number systems, since the goal is automatic recall, not memorization.
- Spend five minutes each morning counting objects around you using 개, 명, and 잔 with the correct contracted forms.
- Read your phone’s clock aloud in full Korean time expressions for a week before checking yourself against a chart.
- Practice reading five random prices from receipts or menus using Sino-Korean and the 원 counter.
- Say your own phone number aloud in Korean until it comes out without hesitation.
- Pick five large numbers, like population figures or prices in the millions, and read them using 만 and 억.
- Role-play ordering food or drinks, counting items with 개 and 잔 as you go.
A reasonable goal is mastering 1 through 20 in both systems within a week, then adding counters and time expressions in the second week. Watching Korean variety shows or dramas with subtitles and pausing on number-heavy scenes, like ordering food or checking a watch, reinforces the patterns in context. Pairing this with a short list of useful conversation phrases gives you full sentences to practice numbers inside, rather than isolated words.
What learners actually struggle with, and what helps
Most learners treat the two number systems as a memorization problem, but the real obstacle is speed under pressure. You can recite a chart perfectly and still freeze when a cashier tells you the total out loud. The fix is not more charts, it is more exposure to numbers inside real sentences, which is why teaching by domain (time, then money, then counting people) tends to work better than teaching the systems side by side from day one.
Instructors typically start with 개, 명, and 잔 because those three counters cover ordering food, counting people, and basic shopping, which are the situations beginners hit first. Age and time usually come next, since both require the native-to-Sino switch that trips people up the most.
Guided speaking practice, where someone corrects your system choice in real time, closes the gap between knowing the rule and using it instantly. Reading a chart teaches recognition. Talking to a person who catches your mistake mid-sentence teaches instinct, and that difference is what separates fluent counting from hesitant counting.
— Paul
Practice these systems in guided conversation classes
Charts and drills get you most of the way, but real fluency with Korean numbers comes from using them in conversation while someone corrects you in the moment. Korean Explorer’s conversational classes are built around exactly that kind of practice, with native Korean instructors who catch system mix-ups as they happen rather than weeks later.
A few ways our course formats support this:
- The Conversational Korean Beginner 1 Group Class runs through everyday number use, including counters, time, and prices, in a group setting for a fee per person.
- The Private Online Class package of 8 sessions gives you one-on-one correction on exactly the mistakes you make most, with packages available for multiple sessions.
- Both formats run on Zoom for learners who want flexible scheduling without commuting to a physical classroom.
Our main training location sits at 10 Anson Road, Level 22, International Plaza, right above Tanjong Pagar MRT, for learners who prefer in-person sessions. If you want to test the format before committing, check our course options and ask about trying a class to see how guided number drills feel in real conversation.
Where these rules and charts come from
A few sources go deeper into specific pieces of this topic if you want to study further.
- Korean numerals on Wikipedia is the clearest reference for how large-number grouping with 만 and 억 works, with full comparative charts.
- The Monash University Korean Studies Research Hub guide explains the native-versus-Sino decision logic and the hybrid time rule in detail.
- The Migaku guide to Korean counting systems lays out the domain split between the two systems and the contraction rules for numbers before counters.
- This site’s counters guide ranks the ten most useful counters for new learners with example sentences.
Sources
- Korean Numbers Guide: Learn Both Systems (Sino vs Native)
- Topic #1 – How to know when to use Pure Korean vs Sino-Korean numbers
- Korean numerals — Wikipedia
FAQ
Why does Korean have two counting systems?
Korean developed Native Korean numbers independently from its own vocabulary, while Sino-Korean numbers were borrowed from Chinese characters centuries ago, and both stayed in everyday use for different purposes — see this Coreano currículo: Guia abrangente para escrever um CV eficaz for more on the language’s structure. Over time, each system settled into specific domains, so Sino-Korean now handles dates, money, and large counts while Native Korean handles everyday counting and age.
What is 1 through 10 in Korean?
Korean has two sets: Sino-Korean runs 일, 이, 삼, 사, 오, 육, 칠, 팔, 구, 십, and Native Korean runs 하나, 둘, 셋, 넷, 다섯, 여섯, 일곱, 여덟, 아홉, 열. Which set you use depends on what you are counting, with native numbers typically used for objects and people and Sino-Korean used for math, dates, and phone numbers.
What does 67 mean in Korean counting?
On its own, the number is read as 육십칠 in Sino-Korean or 예순일곱 in Native Korean, depending on what is being counted, such as age or quantity. There is no special cultural meaning attached to the number itself in standard counting contexts.
Why do some Koreans avoid the number 4?
The number 4 (사, sa) sounds similar to the Chinese-origin word for death, and this association led some buildings and elevators to skip or relabel the fourth floor, a pattern borrowed from similar beliefs in other East Asian countries. It is a cultural superstition rather than a counting rule, and it does not change how 사 or 넷 are used in everyday speech.
