Age Calculator
Enter a birth date to get exact age in years/months/days, total days lived and a next-birthday countdown.
Defaults to today; change the end date to compute a historical age.
What is Age Calculator
Enter your date of birth to get an exact age in years, months and days — plus total months, weeks, days and hours lived, the weekday you were born, your zodiac signs and a countdown to your next birthday. Set a custom end date to compute an age at any point in history.
How to use Age Calculator
- Choose your date of birth
- Optionally change the "age at" date to compute a historical age
- Read exact age, cumulative stats and the birthday countdown
Frequently asked questions
How do I get an age on a specific past date?
Change the "Age at date" field to that day — for example set it to 2020-06-01 to see someone's exact age on that date. The year-month-day result and all totals recompute against the new endpoint.
How are the zodiac signs determined?
The Western sign comes from the month/day range of the birthday (March 21–April 19 is Aries); the Chinese zodiac follows the 12-year cycle of the birth year. Both are fun extras and do not affect the age math.
Is the day of birth itself counted?
No — total days counts complete elapsed days between the two dates, so the birth day is day 0. Add 1 yourself if you need an inclusive count.
Is Age Calculator free?
Age Calculator is completely free — open the page and use every feature with no hidden charges.
Do I need to download or install Age Calculator?
No download or installation is needed. It is an online tool that runs in the browser on your phone, tablet and computer.
Do I need an account to use Age Calculator?
No. Use the tool right away — no account or sign-in required.
Does Age Calculator work on mobile?
Yes. The page is fully responsive and works on phones, tablets and desktop browsers.