Age Calculator

Knowing your age down to the day turns a vague number into an exact measure of time lived, broken out in years, months, and days. Alongside that breakdown, the tool tallies the total months, weeks, and days you have been alive, counts the days to your next birthday, names the weekday you were born on, and identifies your astrological zodiac sign for a lighter, personal touch.

At its core the calculation subtracts your birth date from the "To" date, which starts at today and can be set to any other date, but doing that precisely means accounting for the uneven length of each month and for leap years. The total-days figure sums every day between your birth date and today, folding in each leap day that falls inside that span so the count stays exact rather than rounded.

Accuracy depends entirely on the birth date you enter, the year very much included, since a misremembered day or year quietly skews every result that follows. Double-checking that entry is the single most important step. The zodiac sign, for its part, follows the tropical zodiac and can shift slightly under other systems, so treat that piece as approximate.