Korean Numbers: Big Numbers (만, 억, 조)

Korean groups large numbers by 10,000 (만), not 1,000. This is the biggest mental shift for English speakers. 1 million = 백만 (100 만). 1 billion = 십억...

The Rule

Korean groups large numbers by 10,000 (만), not 1,000. This is the biggest mental shift for English speakers. 1 million = 백만 (100 만). 1 billion = 십억 (10 억). Korean has TWO completely separate number systems — Native Korean (하나, 둘, 셋) and Sino-Korean (일, 이, 삼). English speakers must learn WHEN to use which system, because mixing them up is a common and noticeable mistake.

Why English Speakers Get It Wrong

English has one number system. Korean has two, and you must pick the RIGHT one depending on what you're counting. Using Sino-Korean where Native Korean is required (or vice versa) sounds as wrong to Koreans as saying "I have three-th cats" sounds in English. Key numbers for this topic: • 만 (man) = 10,000 • 억 (eok) = 100,000,000 (hundred million) • 조 (jo) = 1,000,000,000,000 (trillion)

How It Works

Korean groups large numbers by 10,000 (만), not 1,000. This is the biggest mental shift for English speakers. 1 million = 백만 (100 만). 1 billion = 십억 (10 억). Examples: • 인구가 오천만 명이에요. (inguga ocheonman myeongieyo.) — "The population is 50 million." • 그 건물이 십억 원이에요. (geu geonmuri sipeok wonieyo.) — "That building is 1 billion won." • 국가 예산이 육백조 원이에요. (gukga yesani yukbaekjo wonieyo.) — "The national budget is 600 trillion won." English: thousand → million → billion → trillion (×1,000 each). Korean: 만(10K) → 억(100M) → 조(1T) (×10,000 each). To convert: 1 million = 100만, 1 billion = 10억. Korean news often says 억 for large amounts — get comfortable with this unit.

Real Examples

• 인구가 오천만 명이에요. (inguga ocheonman myeongieyo.) — "The population is 50 million." • 그 건물이 십억 원이에요. (geu geonmuri sipeok wonieyo.) — "That building is 1 billion won." • 국가 예산이 육백조 원이에요. (gukga yesani yukbaekjo wonieyo.) — "The national budget is 600 trillion won."

Common Mistakes

❌ Using the wrong number system for the context ✅ Big Numbers (만, 억, 조) uses Sino-Korean numbers → Each context has a fixed number system. Memorize which system goes with which context. ❌ Forgetting the shortened forms (하나→한, 둘→두, etc.) ✅ Native Korean numbers 1-4 change form before counters → This is mandatory, not optional. 하나 개 is wrong; 한 개 is correct.

Quick Tip

English: thousand → million → billion → trillion (×1,000 each). Korean: 만(10K) → 억(100M) → 조(1T) (×10,000 each). To convert: 1 million = 100만, 1 billion = 10억. Korean news often says 억 for large amounts — get comfortable with this unit. Practice tip: Pick one number context (like ordering food or telling time) and drill it until it's automatic. Don't try to learn both systems at once — master one usage scenario at a time.

English: thousand → million → billion → trillion (×1,000 each). Korean: 만(10K) → 억(100M) → 조(1T) (×10,000 each). To convert: 1 million = 100만, 1 billion = 10억. Korean news often says 억 for large amounts — get comfortable with this unit.

Examples

인구가 오천만 명이에요. — inguga ocheonman myeongieyo. — The population is 50 million.

그 건물이 십억 원이에요. — geu geonmuri sipeok wonieyo. — That building is 1 billion won.

국가 예산이 육백조 원이에요. — gukga yesani yukbaekjo wonieyo. — The national budget is 600 trillion won.