Birthday Calculator
Curious about your exact age in days or want to know what day of the week you were born? Enter your birth date and this calculator instantly shows your age in years, days, and hours, plus a countdown to your next birthday and your zodiac sign.
This calculator uses standard date arithmetic to compute the difference between your birth date and today. The age in years matches how age is legally counted: you turn a year older on your birthday, not the day before.
The zodiac sign is based on Western (tropical) astrology date ranges, which assign one of twelve signs based on the position of the Sun at the time of birth. The day-of-week calculation is exact for any date in the Gregorian calendar.
Fun fact: on average, you have lived through about 5,000 sunrises for every 14 years of age. Your 10,000th day alive falls at about age 27, and your 20,000th day around age 54.