Age Calculator
Enter a date of birth to see the exact age, months and days lived, and how long until the next birthday. Korean age systems are shown too.
- Age
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- Korean "year age"
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- Traditional Korean age
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- In months
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- Days lived
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- Next birthday
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- Chinese zodiac
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Everything you enter is processed in your browser and is never sent to or stored on a server.
How age is counted
Most countries count age from 0 at birth and add a year on each birthday, which is the main result here. Korea has used this international age by law since June 2023, but two older systems still appear: "year age" (current year minus birth year), used in some laws, and traditional Korean age, which starts at 1 and adds a year every New Year.
How to use
- Pick a date of birth.
- The age is calculated for today. Change the second date to see the age on another day.
- The age, months and days lived, and the next birthday appear right away.
Frequently asked questions
How is exact age calculated?
Subtract the birth year from the current year, then subtract one more if this year's birthday has not happened yet. You turn a year older on your birthday.
What about people born on February 29?
In years without February 29, the birthday is counted as February 28.
How is the Chinese zodiac sign worked out?
It uses the Gregorian birth year. The zodiac year actually changes at Lunar New Year, so people born in January or early February may belong to the previous year's sign.
Is my date of birth saved?
No. Everything is calculated in your browser, and your date of birth is never sent to or stored on a server.