Age Calculator

Exact age is calculated by taking the difference between the birth date and the current or target date. It tracks years, months, and days while carefully adjusting for varying month lengths and leap years. If the target day is less than the birth day, the calculation borrows the number of days in the previous month to ensure calendar accuracy.

A half birthday is a milestone that occurs exactly six months after your birthday. For example, if your birthday is on January 15, your half birthday is July 15. This calculator helps determine the exact date of your next half birthday.

Unlike the Gregorian calendar, the traditional Chinese zodiac is based on the lunar calendar. The boundary between zodiac years is the Chinese New Year, which changes annually between January 21 and February 20. If you were born in early January or February, this calculator references the exact lunar new year date to determine if you belong to the previous year's animal.

Yes. By changing the 'Calculate age as of' input from today's default date to a custom past or future date, you can answer questions like 'How old will I be on the year 2050?' or 'How old was I on the day of the moon landing?'

Because standard human lifetimes comprise tens of thousands of days. For example, a 30-year-old has lived over 10,950 days and 1,560 weeks. Seeing the total days or weeks alive presents a unique perspective on life milestones.

Leap years contain 366 days, adding February 29. The calculator tracks leap days accurately. If you were born on February 29, 2000, and evaluate your age on February 28, 2001, the system computes exactly 0 years, 11 months, and 30 days, correctly showing 1 year when advancing to March 1 (or Feb 29 on leap years).

It is the count of days remaining until your next birthday. This value ranges from 0 days (if today is your birthday) up to 365 days (or 366 days if a leap year is involved).

The day of the week you were born on is determined by calculating the calendar day index using Zeller's congruence algorithm or browser JavaScript Date objects, returning Sunday through Saturday.

Western astrology defines 12 sun signs based on the date of birth. For example, Aries is March 21 to April 19, Taurus is April 20 to May 20, and so on. The tool automatically maps your birth date to the correct sign.

No, your birth date is processed entirely on your local machine using standard JavaScript. No inputs or results are uploaded to a database, ensuring absolute privacy.