Find out exactly how old you are - in years, months, days, hours, and minutes. The calculator updates in real-time as you type, shows your zodiac signs, generation label, and counts down to your next birthday.
Age calculator
Using the calculator
Enter a Birthday and optionally an Age on date to calculate age at any point in time. The tool calculates instantly - no button to click.
The calculator shows:
- Your Age - years, months, and days (the big number up top)
- Age Breakdown - total months, weeks, and days you've been alive
- Details - day of week you were born, your generation (with years), total hours and minutes lived
- Birthday countdown - days until your next birthday with the date and age
- Zodiac Signs - Western (Aries, Taurus, etc.) with date ranges and Chinese zodiac
Age on any date
The Age on field lets you calculate age at any point in time. Want to know how old Abraham Lincoln was at the Gettysburg Address? How old you were when you graduated? Enter your favorite dates in the two fields.
Leave it blank or set it to today's date to see current age.
How age is calculated
Age calculation seems simple until you hit the edge cases. Let's talk age edges!
Years, months, days
The calculator uses calendar-based math, not simple day division. Someone born on January 31 who is calculated on March 1 has aged one month (not zero months because February is short).
This matches how people actually think about age - "I'm 25 years and 3 months old" rather than dividing total days by 365.25.
Total days, weeks, months
The breakdown section shows totals based on actual elapsed time:
- Days - exact count from birthday to target date (includes leap days)
- Weeks - total days divided by 7
- Months - (years x 12) + remaining months
A year isn't exactly 52 weeks - it's 52 weeks plus 1 day (or 2 in leap years). That's why week counts don't land on neat multiples of 52 on birthdays.
Hours and minutes
Yes, these calculations account for leap years. We calculate from actual elapsed milliseconds between dates, so leap days are automatically included.
Generation definitions
The calculator uses Pew Research Center definitions:
- Greatest Generation: 1901-1927
- Silent Generation: 1928-1945
- Baby Boomers: 1946-1964
- Generation X: 1965-1980
- Millennials: 1981-1996
- Generation Z: 1997-2012
- Generation Alpha: 2013-present
Zodiac notes
Western zodiac uses standard tropical astrology dates. The exact day the sun changes signs can shift slightly year to year, so if you're born on a cusp date (within a day of the changeover), you might identify with either sign.
Chinese zodiac is based on birth year using the Gregorian calendar. Technically, the Chinese zodiac follows the lunar new year (late January or February), so if you're born in January or early February, you might actually be the previous year's animal. This calculator uses the simple Gregorian year method.
More age calculators
Want to go deeper? We built an entire suite of age calculators for specific units:
Each includes live counters (for seconds/minutes/hours) and milestone tracking.
