Age Calculator
Enter your birth date to calculate international age, Korean age, total days lived, total months, and days until your next birthday.
International Age vs. Korean Age
International age increases by one only after your birthday passes. This is the standard system used in most countries, and it became the legal default in Korea in 2023.
Korean age starts at one at birth and increases on January 1 each year. It can be up to two years higher than international age.
Example
Example: born June 15, 1990 with a reference date of March 1, 2025
- International age: 34
- Korean age: 36
- Total days: about 12,677 days
- Until next birthday: about 107 days
Frequently Asked Questions
Has international age been the legal default in Korea since 2023?
Yes. Since June 28, 2023, official documents and laws in Korea use international age by default.
How is military or service age calculated?
Military administration often uses year age, calculated as current year minus birth year. For example, someone born in 2005 is 20 by year age in 2025.
Can I calculate age for a past or future date?
Yes. Set any reference date and the calculator will compute age for that date.