Fun birthday facts
- Leap year birthdays (Feb 29): If you're born on Feb 29, you only get a "real" birthday every 4 years — odds of 1 in 1,461. This calculator finds your closest birthday in non-leap years too.
- Most common birthday: September 9 is statistically the most common birthday in the US (conception ~New Year's Eve). December 25 is the rarest.
- Shared birthday paradox: In a group of just 23 people, there's a 50% probability that two people share a birthday. In a group of 70, it's 99.9%.
- Day of the week: The day you were born can be calculated exactly using the Doomsday algorithm — we use a precise date-math method here.
Western Zodiac Signs
| Sign | Dates | Element |
|---|---|---|
| ♈ Aries | Mar 21 – Apr 19 | Fire |
| ♉ Taurus | Apr 20 – May 20 | Earth |
| ♊ Gemini | May 21 – Jun 20 | Air |
| ♋ Cancer | Jun 21 – Jul 22 | Water |
| ♌ Leo | Jul 23 – Aug 22 | Fire |
| ♍ Virgo | Aug 23 – Sep 22 | Earth |
| ♎ Libra | Sep 23 – Oct 22 | Air |
| ♏ Scorpio | Oct 23 – Nov 21 | Water |
| ♐ Sagittarius | Nov 22 – Dec 21 | Fire |
| ♑ Capricorn | Dec 22 – Jan 19 | Earth |
| ♒ Aquarius | Jan 20 – Feb 18 | Air |
| ♓ Pisces | Feb 19 – Mar 20 | Water |