Korean Counter 일: How to Count days of the month

Use Sino-Korean numbers with 일 to count dates.

The Rule

일 is the counter for days of the month: dates. In Korean, you can't just say a number + noun. You MUST use a counter word between them. This is like English "two SHEETS of paper" or "three CUPS of coffee" — except Korean does this for EVERYTHING. Even "three apples" needs a counter: 사과 세 개.

Why English Speakers Get It Wrong

English only uses counters for uncountable nouns ("a glass of water", "a piece of cake"). Korean uses counters for ALL nouns — even ones English counts directly. The second trap: Korean has TWO number systems. 일 uses Sino-Korean (일, 이, 삼...) numbers. Using the wrong system is a common mistake that sounds immediately wrong to Korean ears.

How It Works

Pattern: Noun + Number + 일 Sino-Korean numbers: 일(1), 이(2), 삼(3), 사(4), 오(5), 육(6), 칠(7), 팔(8), 구(9), 십(10) The counter 일 comes right after the number. The noun can come before or after the number+counter, but before is more natural in conversation.

Real Examples

• 삼월 십사일이에요. (samwor sipsairieyo.) — "It's March 14th." [Sino-Korean for dates] • 며칠이에요? (myeochirieyo?) — "What date is it?" [며칠 = what day of the month]

Common Mistakes

❌ Using native Korean numbers with 일 ✅ Use Sino-Korean numbers: 삼월 십사일이에요. → 일 always takes Sino-Korean numbers. Mixing number systems is one of the most common counter mistakes. ❌ Saying the number without a counter (e.g., "사과 세") ✅ Always include the counter: 삼월 십사일이에요. → Dropping the counter sounds incomplete in Korean, like saying "three of" without finishing the phrase in English.

Quick Tip

Start with the 5 most common counters: 개 (things), 명 (people), 마리 (animals), 잔 (cups), 병 (bottles). Once these are automatic, add 일 to your toolkit. Practice counting things you see daily: "커피 두 잔", "사람 세 명". The more you use counters in real situations, the faster they become natural.

일 = days of the month. Uses Sino-Korean numbers.

Examples

삼월 십사일이에요. — samwor sipsairieyo. — It's March 14th.

며칠이에요? — myeochirieyo? — What date is it?