Your exact age is calculated by subtracting your date of birth from today's date, accounting for the specific day and month — not just the year. For example, if you were born on December 15, 1990, and today is May 19, 2026, your exact age is 35 years, 5 months, and 4 days. Simply enter your date of birth above and this calculator does it instantly.

Generations are defined by birth year ranges: Greatest Generation (before 1928), Silent Generation (1928–1945), Baby Boomers (1946–1964), Gen X (1965–1980), Millennials (1981–1996), Gen Z (1997–2012), and Gen Alpha (2013–present). Enter your date of birth above and your generation will be highlighted in the Generations section automatically.

To calculate the number of days you've lived, multiply your complete years by 365.25 (to account for leap years), then add the remaining months and days. A 35-year-old has lived approximately 12,784 days. This calculator shows your exact day count the moment you enter your birthday.

Your Western zodiac sign is determined by your birth month and day — for example, Aries runs from March 21 to April 19, and Capricorn from December 22 to January 19. Your Chinese zodiac animal is determined by your birth year and cycles through 12 animals every 12 years: Rat, Ox, Tiger, Rabbit, Dragon, Snake, Horse, Goat, Monkey, Rooster, Dog, and Pig. Both are shown automatically when you enter your date of birth.

A Martian year lasts 686.97 Earth days — nearly twice an Earth year. To find your age on Mars, divide the total number of days you've lived by 686.97. A 30-year-old on Earth is roughly 16 on Mars. This calculator shows your age on six planets: Mercury, Venus, Mars, Jupiter, Saturn, and Neptune.

Enter your date of birth above and this calculator will tell you exactly which day of the week you were born. It also shows the traditional English nursery rhyme line for that day — for example, "Monday's child is fair of face" or "Friday's child is loving and giving."

Millennials were born between 1981 and 1996, growing up as the internet emerged and came of age during 9/11 and the 2008 financial crisis. Gen Z were born between 1997 and 2012 — true digital natives who grew up with smartphones from childhood, social media as a constant, and climate anxiety as a defining concern. The key dividing line is roughly 1996–1997.

A full moon occurs approximately every 29.53 days, which works out to about 12.37 full moons per year. A 30-year-old has witnessed roughly 371 full moons since birth. Enter your birthday above to see your precise count in the Interesting Stats section.