Birthday Calculator – Age, Countdown, Zodiac & Days Lived

Enter your date of birth and the calculator instantly shows your total days lived — the calendar day count from your birth to today, accounting for every leap year. You'll also see total weeks lived, exact age, and a countdown to your next birthday.

The calculator provides your sun sign based on standard Western tropical astrology date ranges. Sun sign boundaries can shift by a day depending on the year and birth location. For a complete astrological profile (rising and moon signs), you would need your exact birth time and place.

The calculator determines your birth weekday using a mathematical calendar algorithm that counts days from January 1, 1900 (a Monday) to your birth date, accounting for all leap years. The result is mathematically exact.

Yes. Every leap year since your birth is counted in the total days lived, total weeks lived, and age calculation. Someone born 40 years ago has lived through roughly 10 leap days. The result follows standard Gregorian calendar leap year rules.

Enter a name in the optional name field to personalize your display. You can then screenshot, print, or share the results page with friends and family. The calculator updates daily, so the countdown and days-lived numbers are always current.