Age Calculator
Runs entirely in your browser
Find your exact age in years, months and days, plus your next birthday countdown, zodiac sign and generation. Everything updates instantly and is calculated directly in your browser.
Choose your date of birth below to see your exact age.
How to use Age Calculator
- Choose your day, month and year of birth.
- Optionally change "Calculate age as of" to a different date — it defaults to today.
- Your exact age, next birthday countdown and other details appear instantly — no button needed.
Features
- Exact age in years, months and days, updated live as you pick a date.
- Easy day/month/year dropdowns — no fiddly calendar widget to scroll back decades.
- Calculate age as of any past or future date.
- Visual progress ring showing how close you are to your next birthday.
- Total days, weeks and months lived.
- Shows the day of the week you were born on, your zodiac sign and generation.
- 100% client-side — your date of birth is never sent to a server.
Frequently Asked Questions
How is my age calculated?
Age Calculator compares your date of birth with the reference date (today, by default) and works out the full number of years, months and remaining days between the two dates.
Can I calculate my age as of a different date?
Yes. Change the "Calculate age as of" field to any date to see how old you were, or will be, on that date.
Is my date of birth sent to a server?
No. All calculations happen directly in your browser. Your date of birth is never uploaded, saved or sent anywhere.
What if I was born on February 29?
In non-leap years, your next birthday is calculated as March 1, since February 29 doesn't exist that year.
Why do the total days and total months look different from years × 12?
Months have different lengths, so total months and total days are calculated directly from the calendar rather than a simple multiplication, giving you an accurate figure.
How is my zodiac sign determined?
Your Western zodiac sign is worked out from your birth month and day using the standard date ranges used in astrology (for example, March 21 – April 19 is Aries).
How is my generation calculated?
Generation labels (like Gen Z or Millennial) are based on commonly used birth-year ranges. Different sources define the exact cutoff years slightly differently, so treat this as a general guide rather than an official classification.