Age Calculator
Your exact age in years, months and days — plus total days lived, the weekday you were born, and the countdown to your next birthday.
Private by design: everything runs in your browser. Nothing is uploaded.
How it works
- Pick a mode: your age, days between two dates, or add/subtract days from a date.
- Enter the date(s) and hit Calculate.
- Copy the result as a ready-to-share sentence if you like.
FAQ
How is the exact age calculated?
Years, months and days are computed from the calendar, not by dividing by 365 — so leap years and month-end boundaries (like Jan 31 to Feb 28) are handled correctly.
What about Feb 29 birthdays?
For the next-birthday countdown, Feb 29 birthdays are celebrated on Feb 28 in non-leap years.
Does it use my time zone?
Yes — "today" is your device's local date, and day counts are computed on calendar days so daylight-saving changes can't shift the result.