Age Calculator
Find your exact age in years, months and days, plus the traditional Chinese age, next birthday, days lived and zodiac sign.
Age
Enter a date of birth to see the age, the traditional Chinese age, the next birthday and the zodiac sign.
How to use
- Enter a “Date of birth”, such as 1990-08-15 or 19900815. ROC dates such as 79/08/15 or 0790815 work too.
- “Age on” defaults to today; change it to find the age on another day, such as an application deadline.
- The result shows the exact age in years, months and days, the traditional Chinese age, a countdown to the next birthday, the days since birth, the weekday of birth and the zodiac sign.
- For a February 29 birthday, choose whether a year is complete on February 28 or March 1 in common years.
FAQ
What is the traditional Chinese age (虛歲)?
In the traditional East Asian count, a baby is 1 at birth and everyone gets a year older at Lunar New Year rather than on their birthday. It is usually 1 more than the age, or 2 more between Lunar New Year and the birthday. Official documents use the ordinary age.
How are Lunar New Year dates determined?
The tool includes the Lunar New Year date of every year from 1900 to 2100, computed with an astronomical algorithm that follows the current Chinese calendar rules (months start on the new-moon day in UTC+8) and checked against published dates. Outside that range the traditional age is not shown.
Is the zodiac sign based on the Gregorian year?
No, on the lunar year: people born in January or February before Lunar New Year belong to the previous year’s sign, and the tool points this out. Some astrologers use the solar term 立春 (around February 4) instead, which can differ for a few days.
How is age calculated for someone born on February 29?
Common years have no February 29. Many people celebrate on February 28, others on March 1. The tool uses February 28 by default, and you can switch to March 1.
Does “Days since birth” count the day of birth?
No. It is the number of days between the date of birth and the “Age on” date, so it is 0 on the day of birth. Add 1 for “today is day N of my life”.
Is my date of birth uploaded?
No. Everything is calculated in your browser and never leaves your device.
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Run a timer (1, 5, 25 minutes or custom) or count down to a date, with pause, a sound alert, notifications and share links.