Korean Age Calculator

Calculate your Korean age, international age, and see the difference. Learn how the traditional Korean age system works.

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Korean Age System

Calculates your age using the traditional Korean system where you're 1 at birth and gain a year every January 1st.

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Side-by-Side Comparison

See your Korean age, international age, and the exact difference between them at a glance.

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Frequently Asked Questions

How does Korean age work?
In the traditional Korean age system, a baby is considered 1 year old at birth (counting the time in the womb). Everyone then gains one year on January 1st, regardless of their actual birthday. This means a baby born on December 31st would turn 2 years old the very next day on January 1st. The formula is simple: Korean Age = Current Year - Birth Year + 1.
What is the difference between Korean age and international age?
Korean age is typically 1 to 2 years older than international age. If you have already had your birthday this calendar year, the difference is 1 year. If your birthday has not yet passed this year, the difference is 2 years. International age (used in most countries) counts from 0 at birth and increases on your actual birthday.
Does South Korea still use Korean age?
South Korea officially adopted the international age system for legal and administrative purposes in June 2023. However, Korean age (만 나이 vs 세는 나이) is still deeply embedded in Korean culture and widely used in everyday conversations, social hierarchies, and informal settings. Many Koreans still think of their age in the traditional system.
How do I calculate my Korean age quickly?
The quickest formula: take the current year, subtract your birth year, and add 1. For example, if you were born in 1995 and it's 2026: 2026 - 1995 + 1 = 32 Korean age. Your international age would be either 30 or 31 depending on whether your birthday has passed.
Do other countries use a similar age system?
Historically, similar age counting systems existed in China, Japan, Vietnam, and other East Asian countries. However, most of these countries have since adopted the international age system. South Korea was the last major country to officially use the traditional system before switching in 2023.