Age Calculator
Calculate your exact age in years, months, and days.
Age
Enter a birth date above
Total days lived
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Next birthday in
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Key features
Enter a birth date to calculate exact age in years, months, and days as of today (or any other date you choose), plus the total number of days lived and how long until the next birthday.
Everything is calculated locally in your browser. Nothing you enter is stored or sent anywhere.
How to use
Enter a birth date
Pick the date of birth you want to calculate age from.
(Optional) change the "as of" date
Defaults to today — change it to calculate age as of any other date.
Read the result
Exact age, total days lived, and a countdown to the next birthday appear instantly.
Frequently asked questions
How is the years/months/days breakdown calculated?
It counts full calendar years, then full calendar months within the remaining time, then the remaining days — the same way you’d count age by hand, accounting for different month lengths and leap years.
Can I calculate age as of a future or past date?
Yes — change the "as of" date to anything you like, past or future, to see age at that specific point in time.
Is my birth date stored anywhere?
No. It’s used only to calculate the result locally in your browser — nothing is stored or transmitted.