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Calculator Tool
Enter your birthdate to see your legal age, calendar-year age, and traditional age at a glance. Also displays your birth day, zodiac sign, and star sign.
Age Calculator helps you understand the three ways of calculating age used in Korea: legal age (만 나이), calendar-year age, and traditional counting age. Since Korea unified to legal age in 2023, most official contexts use that standard—but many people still think in calendar-year terms or refer back to traditional counting. This tool clears up the confusion by showing all three at once, plus your zodiac sign and other birth details.
Enter your birthdate in YYYY-MM-DD format (for example, 2000-03-15) in the birthdate field. By default, the tool calculates age as of today. If you want to see what your age was on a different date, turn on the 'Reference date' toggle and pick a specific date. Press Enter or finish typing to see your results instantly.
Save your family members' and friends' birthdates so you can instantly recalculate by clicking their name. The 'Recent calculations' list automatically saves dates you've looked up before, so you don't have to type them again. Copy your results and paste them into messages or notes to share with others.
Legal age is how many times your birthday has passed since birth—it's the international standard and Korea's official legal standard. Calendar-year age is simply the current year minus your birth year. Traditional age is a Korean custom where you're considered 1 year old at birth and gain a year on January 1st every year. Korea officially switched to legal age in June 2023.
People born on February 29 celebrate their birthday on February 28 or March 1 in non-leap years. This tool automatically calculates your age correctly regardless of the reference year.
Your recent calculation history and saved people are stored only in this browser's local storage and never sent to any server. If you clear your browser data, this information will be deleted.
Yes, turn on the 'Reference date' toggle to pick any date in the past or future. This lets you calculate what someone's age was or will be on a specific date.
Yes, it works great on mobile browsers with no app needed.
This tool uses traditional lunar-based calculation methods. The zodiac and star sign follow the conventions commonly used in Korean culture. (More precise lunar calendar calculations may be added in future updates)