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
Age Calculator is for everyday date, time, health, planning, lookup, and decision tasks that you want to finish quickly on desktop or mobile.
How to use it
For Age Calculator, enter the date, number, or search condition shown on the page, then choose the location, unit, or mode if the tool provides one.
How to read the result
After using Age Calculator, use the result for planning or a first estimate. If it affects health, money, legal matters, or official data, compare it with an authoritative source.
Privacy and limits
When using Age Calculator, most everyday tools run in the browser with no account. If you enter birthdays, addresses, or personal details, provide only what is needed.
For Age Calculator: Everyday tools are built for convenience and speed. They do not replace professional advice or the latest official information.
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?
In non-leap years, March 1 is used as the birthday, which is the standard civil convention in Taiwan.
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.