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
Useful for quick file work, text cleanup, calculations, content creation, and website or AI checks.
How to use it
Open the tool, enter or upload what it asks for, then copy or download the result directly.
Privacy and limits
Most tools run in your browser with no sign-in. Very large files or older devices may hit browser memory limits.
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.