How is age calculated?

When we say "I'm 30," that's really just a rough number. Your precise age counts years, months, and days from your date of birth to today. This calculator does exactly that, and also tells you how many total days you've been alive — which is a surprisingly fun number to know.

Zodiac sign date ranges

The twelve zodiac signs are determined by your birth date: Aries (Mar 21–Apr 19), Taurus (Apr 20–May 20), Gemini (May 21–Jun 20), Cancer (Jun 21–Jul 22), Leo (Jul 23–Aug 22), Virgo (Aug 23–Sep 22), Libra (Sep 23–Oct 22), Scorpio (Oct 23–Nov 21), Sagittarius (Nov 22–Dec 21), Capricorn (Dec 22–Jan 19), Aquarius (Jan 20–Feb 18), Pisces (Feb 19–Mar 20).

What about leap year birthdays?

If you were born on February 29, this calculator counts your next birthday as March 1 in non-leap years. A leap year happens every 4 years, except for years divisible by 100 — unless they're also divisible by 400. So 2000 was a leap year, but 1900 was not.