Exact age in years, months, days, weeks, hours, and minutes. Free, private, runs in your browser.
100% private — your files never leave your browser. All processing happens locally on your device.
A typical 'how old are you' answer flattens a life into one number. This calculator expands it: exact years, months, and days; total weeks since birth; day of the week you were born on; minutes you've been alive; and days until your next birthday. Useful for filling in forms that want exact age-as-of-a-date, for curiosity, and for remembering that your next birthday is closer than you think.
Naïvely subtracting two dates and dividing by 365.25 gives wrong answers around month and year boundaries. The right way is month-by-month with borrowing — exactly how the calculator works inside. A baby born on March 31 is '1 month old' on April 30 (not May 1), and 'one year old' on March 31 next year (not a year of 365 days later). The calculator respects these calendar-year conventions rather than averaging in partial months.
Alongside the calendar breakdown, the tool shows the raw totals: total days lived, total weeks, total hours, total minutes. These are useful for trivia ('I've been alive for 10,000 days today'), for milestone planning, and for comparing timespans when the years/months/days form isn't useful.
The days-until-next-birthday value factors in whether your birthday has already happened this year. If it has, the countdown targets next year's. Use this for gift planning, party reminders, or just appreciating that the next round number is never as far away as it seems.
Date of birth is one of the more sensitive pieces of personal information — it's a common identity-verification field. This calculator runs entirely in your browser; no values are transmitted, logged, or persisted. Close the tab and the data is gone.
Yes. The calendar math uses actual month lengths and handles February 29ths correctly. Someone born on a leap day ages normally — their 'birthday' falls on Feb 28 or Mar 1 in non-leap years depending on the convention, and we use the calendar-month rule.
The tool shows the weekday you were born on — a fun fact and useful for astrology / numerology questions. It's computed from the ISO day-of-week of the date you enter.
Yes. The 'Age as of' field defaults to today but accepts any date on or after the date of birth. Useful for 'how old will I be on X?' and 'how old was I when Y happened?' questions.