What is the Korean Age Calculator?
The Korean Age Calculator is an online tool that calculates International Age (global standard), Korean Age (traditional counting), and Year Age (used in certain laws) all at once from your birthdate. It helps you navigate the often confusing age calculations, especially since Korea's 2023 Age Unification Law.
Beyond age calculation, it provides a birthday D-Day counter, zodiac animal, zodiac sign (constellation), generation classification (Millennial, Gen Z, etc.), and age milestones (Hwangap at 60, Gohui at 70, etc.).
Key Features
3 Age Systems
Compare International Age (legal standard), Korean Age (traditional), and Year Age (military/youth protection laws) at a glance.
D-Day & Detailed Age
Shows days until your next birthday along with detailed age in years, months, and days.
Zodiac & Constellation
Automatically calculates your Chinese zodiac animal and Western zodiac sign based on birthdate.
Generation & Milestones
Identifies your generation (Gen X, Millennial, Gen Z, etc.) and shows traditional age milestones.
How to Use
- Enter Birth Date — Select your date of birth.
- Set Reference Date — Change the reference date if you want to calculate age for a specific date. Default is today.
- Calculate — Click the 'Calculate Age' button.
- View Results — See your International Age, Korean Age, Year Age along with zodiac, constellation, and birthday D-Day.
Use Cases
Age Unification Law
Verify your legal age under Korea's 2023 Age Unification Law that standardized age to International Age.
School Enrollment Age
Check your child's enrollment eligibility by comparing International Age and Year Age.
Military Service Timing
Determine conscription eligibility based on Year Age as used in the Military Service Act.
Insurance & Contracts
Verify your exact International Age for insurance applications, loan assessments, and other contracts.
Frequently Asked Questions
What is the difference between International Age and Korean Age?
International Age starts at 0 at birth and adds 1 on each birthday. Korean Age starts at 1 at birth and adds 1 every January 1st. So Korean Age is typically 1-2 years older than International Age.
What is Korea's 2023 Age Unification Law?
Since June 28, 2023, Korea unified legal age to 'International Age' (Man-nai). Contracts, official documents, and legal applications now use International Age as the standard.
When is Year Age used?
Year Age (Current Year - Birth Year) is used in some Korean laws like Military Service Act (determining conscription eligibility) and Youth Protection Act (alcohol/tobacco purchase age).
How do other countries calculate age?
Most countries use International Age. The Korean counting age system is quite unique - only a few East Asian countries had similar traditions historically.
Privacy Notice
Your birthdate is processed entirely in the browser and is never sent to or stored on any server. All data is deleted when you close the page. You can use this tool with complete confidence.