🎂Age Calculator

How your age is calculated

The calculator subtracts your birth date and time from the current moment and breaks the difference into years, months, days, hours, minutes, and seconds. It works the way a calendar does, not a fixed 365.25-day average, so it borrows from the month and year the same way you would counting on your fingers: if today's day-of-month is earlier than your birth day-of-month, it borrows a month's worth of days first. The next birthday countdown finds the closest upcoming date that matches your birth month and day.

Reading the live counters

Alongside your age in years, the panel shows totals measured in plain 24-hour days: days lived, weeks lived, and hours lived, each counted from the instant you were born. The live line at the bottom ticks up every second so you can watch the seconds accumulate in real time. All of this runs in your browser; the page never sends your birth date anywhere.

A couple of quirks worth knowing

If you were born on February 29 in a leap year, years without a February 29 shift your birthday to March 1, since that's how the date rolls over on a calendar. And because the month-and-day breakdown borrows only from the single month before today, a handful of end-of-month birthdays can show a day count that looks slightly off in the days after the month rolls over. It corrects itself within a day or two and never affects the totals or the next-birthday countdown.