Age Calculator
Calculate exact age and next birthday countdown
Quick guide
What can Age Calculator help you do?
Free online age calculator. Enter your birthdate to calculate exact age in years/months/days, days until your next birthday, and your Chinese zodiac sign.
Best for
Calculate age at a date, traditional age, Chinese Zodiac, and birthday countdown. Enter a birthdate or ROC year; formal eligibility uses local rules.
How to use it
Enter Birthdate and Calculate as of, press Calculate. ROC year mode asks for month and day; results show age, traditional age, zodiac, and countdown.
How to read the result
Traditional age starts at 1 and rises each Lunar New Year; zodiac follows that year. Feb 29 uses Feb 28 in common years.
Privacy and limits
Birthdate and target date stay in your browser, are not uploaded or saved. For estimates, use an approximate date.
Traditional age, zodiac, and Feb 29 rules vary. For insurance or eligibility, follow the authority’s completed-age rule.
Frequently Asked Questions
How is age calculated?
Age is calculated from your birthdate to the target date (default: today) in complete years, months, and days.
What happens for Feb 29 birthdays?
This tool uses Feb 28 for both completed age and the next-birthday countdown in common years. Formal eligibility may use a different rule in your jurisdiction.
How is the Chinese Zodiac determined?
Based on birth year (Western calendar): 1900 = Rat, cycling every 12 years. Note: traditionally, zodiac follows the lunar new year.
Can I calculate age at a specific date?
Yes, enter a target date in the "Calculate as of" field.
What is Traditional Age (虛歲)?
In East Asian tradition, a person is 1 year old at birth and gains a year on each Lunar New Year, making them 1–2 years older than the Western age.