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International Age (Man Age) Calculator
Free international age (man age) calculator. Enter a birth date to see today's age counted from your birthday and the year-based age, right in your browser.
Run it in your browser
Free · no sign-up · files stay on your device
Everything runs in your current browser. Selected files and text are not sent to our servers. Some tools download a small engine the first time you run them.
Launch the toolHow to use it
- Pick the date of birth.
- Read the international age (man age) and the year-based age as of today.
- Copy the result if you need it.
Frequently asked questions
How is international age (man age) calculated?
It is the current year minus the birth year, minus one if this year's birthday has not happened yet.
What is year-based age?
The current year minus your birth year, without checking whether your birthday has passed.
Which date counts as today?
Today's date in Korea Standard Time (KST). If you are in another time zone close to midnight, the reference date can differ from your local date.
What about a February 29 birthday?
The tool compares calendar dates in your browser. In years without February 29, the birthday is counted as reached from March 1.
Can I use the result on official documents?
Treat it as a reference value. For administrative, legal or medical decisions, check the latest rules of the relevant authority.