Korean Numeral Converter

What are Korean Numbers?

Korean numbers (also known as "Hangul numerals") are the number writing system used in South Korea and North Korea. There are two main Korean numeral systems: Native Korean Numbers and Sino-Korean Numbers. Native Korean numbers are used for counting small numbers (1-99), such as for age, time, and everyday counting. On the other hand, Sino-Korean numbers are used in formal and written contexts, such as for larger numbers, dates, and times. The Native Korean system uses Korean words to directly represent numbers, while the Sino-Korean system uses Chinese characters to represent numbers.

Conversion Between Native Korean Numbers and Arabic Numbers

Native Korean numbers are used to represent numbers from 1 to 99. They are typically used for small-range counting, and the basic vocabulary is as follows:

Additionally, numbers from 11 to 99 can be represented by combining tens and ones. For example:

• 25 = 스물 (20) + 다섯 (5) → 스물다섯.
• 31 = 서른 (30) + 하나 (1) → 서른하나.
• 86 = 여든 (80) + 여섯 (6) → 여든여섯.

Conversion Between Sino-Korean Numbers and Arabic Numbers

Sino-Korean numbers (또는 한자 숫자, meaning "Chinese character numbers") are used to represent larger numbers, typically for numbers 100 and above. The corresponding relationship with Arabic numerals is as follows:

The system is based on Chinese characters, and the conversion rules are similar to those in Chinese: group the digits, convert each group, and finally combine the results.

Converting Arabic Numbers to Sino-Korean Numbers

1. Grouping: Split the Arabic number into groups of four digits from right to left.
2. Converting Each Group: For each group, use the corresponding Chinese character word and add the appropriate unit (천 for thousand, 백 for hundred, 십 for ten). Skip any empty spaces.
3. Combining: Merge the conversion results from each group and add the correct large number units (조 for trillion, 억 for hundred million, 만 for ten thousand).
4. Omission Rule: If the number starts with "one" in the units of ten, hundred, thousand, or ten thousand (e.g., "일십" for "ten"), the "one" is omitted, and zero is not added.

Example: Converting the Number 123453628

• Grouping: 1 | 2345 | 3628
• Convert Each Group:
  • 1 → 일
  • 2345 → 이천삼백사십오
  • 3628 → 삼천육백이십팔
• Combine: 일억 이천삼백사십오만 삼천육백이십팔
• Therefore, the conversion of 123453628 is 일억 이천삼백사십오만 삼천육백이십팔.

Converting Sino-Korean Numbers to Arabic Numbers

1. Grouping: Split the number by large number units (조, 억, 만).
2. Calculating Each Group's Arabic Value: Based on the identified digits and units (천, 백, 십), compute the weighted value for each group and add them together.
3. Combining: Multiply each group by its corresponding large number unit and sum them to get the final result.

Example: Converting the Korean Numeral 일억 이천삼백사십오만 삼천육백이십팔

• Grouping: 일억 | 이천삼백사십오만 | 삼천육백이십팔
• Calculate the Arabic Number for Each Group:
  • 일억 → 1 × 100000000 = 100000000
  • 이천삼백사십오만 → (2 × 1000 + 3 × 100 + 4 × 10 + 5) × 10000 = 23450000
  • 삼천육백이십팔 → 3 × 1000 + 6 × 100 + 2 × 10 + 8 = 3628
• Combine: 100000000 + 23450000 + 3628 = 123453628