Age Calculator

How to use it

1. Pick the date of birth in the date field.
2. Press Calculate (it also runs when you change the date).
3. Read the exact age in years, months and days, plus the total days lived.
4. Check the days to the next birthday and the zodiac sign shown below.
5. Chinese and Japanese pages also show the Chinese zodiac animal for the birth year.

Common use cases

• Forms and applications: converting a birth date into an exact age.
• Birthdays: how many days are left, at a glance.
• Milestones: the total days lived for a round-number celebration.
• Curiosity: western zodiac sign and Chinese zodiac animal together.

Why it stays private

The date you pick never leaves your browser: the whole calculation is local date arithmetic with no requests and no storage. Note that the Chinese zodiac is derived from the calendar year, so people born in January or February may belong to the previous animal under the lunar calendar.

FAQ

Q: How is the exact age in years, months and days computed? A: By real calendar arithmetic: months are counted month by month and the remaining days borrow the actual length of the previous month, so leap years and 31-day months are handled correctly.

Q: What happens for a February 29 birthday? A: In non-leap years the next-birthday countdown rolls over to March 1, which is how most jurisdictions treat it. The years/months/days age itself is unaffected.

Q: Does the Chinese zodiac follow the lunar calendar? A: No. It is derived from the birth year only, so if you were born in January or February the traditional lunar-based animal may differ by one.