Several ages at once
Enter a birth date and a reference date to see multiple age conventions side by side.
| Age | How it's calculated |
|---|---|
| Age (international) | (this year − birth year), minus 1 if the birthday hasn't passed yet |
| Korean counting age | this year − birth year + 1 |
| Year age | this year − birth year |
The key is the birthday
International age depends on whether this year's birthday has passed. Two people born in the same year differ by one year depending on the date. The tool compares the reference date with the birthday automatically, avoiding the common "counting a year too early" mistake.
Bonus details
- Zodiac: the Chinese zodiac animal from the birth year.
- Days until next birthday: the countdown.
- Days lived: total days from birth to the reference date.
The birth date you enter is never uploaded — everything is computed in your browser. To count days to a specific date, use the Date & D-Day Calculator.