How rare is my birthday?
Enter your birthday to see how rare it is: its rank out of all 366 dates, based on 86 million U.S. births.
Rarest birthdays
- February 29 (leap day, once every four years)
- December 25
- January 1
- December 24
- July 4
- January 2
- December 26
Most common birthdays
See all 366 birthdays ranked, with a popularity calendar →
Frequently asked questions
How rare is my birthday?
Enter your birthday above to see where it ranks among all 366 dates, based on the average number of U.S. births on each date from 1994 to 2014. A rank of 1 is the most common birthday and 366 is the rarest.
What is the rarest birthday?
February 29 is the rarest birthday because it only happens in leap years. Among everyday dates, December 25 is the rarest, followed by January 1, December 24 and July 4.
What is the most common birthday?
September 9 is the most common birthday. Most of the top 10 fall in mid-September.
How is birthday rarity calculated?
We averaged the number of babies born on each calendar date in the United States from 1994 to 2014, using CDC and Social Security Administration figures compiled by FiveThirtyEight, then ranked all 366 dates.