How to use Age calculator
- 1
Enter the date of birth
Pick the birth date; switch on Add time of birth and choose the birth time zone for to-the-second totals.
- 2
Read the age
See years, months and days, the totals in other units and the countdown to the next birthday with its weekday.
- 3
Try another date or person
Change Calculate age on for a past or future date, or switch to Age difference to compare two birthdays.
Limits and Pro
Free and unlimited. Works for any Gregorian date from year 1000 to 9999, with optional birth time and any IANA time zone; live counters update every second.
About Age calculator
Enter a date of birth and the calculator gives the exact age in years, months and days, the way it is written on forms and said out loud, together with the same span expressed as total months, weeks, days, hours, minutes and seconds. When the "age on" date is today, the hour, minute and second counters tick live; add a time and time zone of birth and they become exact to the second, including daylight-saving shifts in the birthplace.
The next-birthday card counts down the days, names the weekday it falls on and the age you will turn. Fun facts follow: the day of the week you were born, your Western star sign, your Chinese zodiac animal and element — worked out from the lunar calendar, so a late-January birthday is not misfiled — and your generation from the silent generation to Gen Alpha. A milestones list shows when you were or will be 10,000 and 20,000 days old, 1,000 weeks old, and your next half birthday.
Two more modes cover common questions. Pick any past or future date to find the age someone was or will be on that day, such as a school entry cut-off or a retirement date. Age difference takes two birth dates and reports the gap in years, months and days, plus the total days between them.
The calculator uses the Gregorian calendar throughout and counts only civil dates for years, months and days, so results never drift by a day because of time zones.
Privacy
Birth dates and times are processed only in your browser — nothing is sent to a server. They are kept out of the page address; this browser's local storage remembers them until you press Reset, and a shareable link is created only when you press Copy link.
Features
Live counters
Hours, minutes and seconds lived, ticking in real time.
Birthday countdown
Days to go, the weekday and the age you'll turn.
Zodiac facts
Star sign plus Chinese zodiac animal and element based on the lunar new year.