Lifestyle
Age Calculator
Calculate completed years of age from a birth date and a reference date.
How to use
Choose a birth date and the date on which to calculate age. The result uses completed years, not Korean counting age.
Formula
Age = reference year − birth year − 1 if this year's birthday is after the reference date
Example
How old is someone born on December 31, 2000 on December 30, 2026?
They are 25; their birthday for 2026 has not occurred yet.
Frequently asked questions
- Can I choose a past reference date?
- Yes, as long as the reference date is on or after the birth date.
- How is a February 29 birthday handled in a non-leap year?
- This calculator treats March 1 as the birthday in a non-leap year.