How Rare Is My Birthday?
Find where your birthday ranks among all 366 dates of the year, from the most common to the rarest, using 21 years of US birth records.
Birthday rarity chart
Every date of the year, shaded by how many US babies were born on it from 1994 to 2014. The stronger the pink, the more common the birthday.
The 10 most common birthdays
- September 9 (12,344 a year)
- September 19 (12,285 a year)
- September 12 (12,282 a year)
- September 17 (12,202 a year)
- September 10 (12,190 a year)
- September 20 (12,162 a year)
- July 7 (12,147 a year)
- September 15 (12,126 a year)
- September 16 (12,114 a year)
- September 18 (12,112 a year)
The 10 rarest birthdays
- December 25 (6,601 a year)
- January 1 (7,827 a year)
- December 24 (8,103 a year)
- July 4 (8,825 a year)
- January 2 (9,356 a year)
- December 26 (9,599 a year)
- November 27 (9,770 a year)
- November 23 (9,919 a year)
- November 25 (10,001 a year)
- October 31 (10,030 a year)
Not counting February 29, which is rarest of all because it only comes every four years.
Birthday month rarity, most common first
- September (11,811 a day)
- August (11,712 a day)
- July (11,563 a day)
- June (11,306 a day)
- October (11,204 a day)
- May (11,022 a day)
- December (10,991 a day)
- February (10,981 a day)
- March (10,979 a day)
- November (10,927 a day)
- April (10,874 a day)
- January (10,721 a day)
How birthday rarity is ranked
We add up every US birth on each calendar date from 1994 to 2014: CDC records for 1994 to 1999 and Social Security records for 2000 to 2014, so no year is counted twice. Then we rank all 366 dates by that total, from #1 (the most babies) to #366 (the fewest).
Ranking by the total means the list shows how many people actually share each birthday. That is why February 29 is always last: it only comes once every four years.
The differences are real but small for most dates. The big outliers are holidays such as December 25, January 1 and July 4, which have far fewer births than the days around them. For the whole list in order, see all 366 birthdays from most to least common. To see how many people share your exact birthday, try the Birthday Twin Finder. You can also check what day you were born or your exact age with the Age Calculator.
Worked example
March 21 had 235,883 US births across the 21 years, about 11,233 a year. That puts it at #149 of 366: about average, and a little more common than most dates.
What the rarity labels mean
Each birthday gets a label from its rank. The 366 dates are split into five equal bands.
| Label | Ranks |
|---|---|
| Very common | #1 to #74 |
| Common | #75 to #147 |
| About average | #148 to #220 |
| Uncommon | #221 to #293 |
| Rare | #294 to #366 |
A label is about the rank, not about how big the gap is. Most dates are close together: 292 of the 365 regular dates are within 5% of the average of 11,175 births a day. A "rare" birthday in the middle of the year may only have a few hundred fewer births than a "common" one.
Birthdays on holidays
Many holidays have far fewer births than an ordinary day. Here is how they compare in the US data.
| Holiday | Rank | Vs average |
|---|---|---|
| New Year's Day | #364 | -30% |
| Valentine's Day | #62 | +4.6% |
| April Fools' Day | #352 | -7.5% |
| Independence Day | #362 | -21% |
| Halloween | #356 | -10.2% |
| Veterans Day | #170 | +0.1% |
| Christmas Eve | #363 | -27.5% |
| Christmas Day | #365 | -40.9% |
| December 26 | #360 | -14.1% |
| New Year's Eve | #348 | -6.6% |
December 25 has about 6,601 births, about 41% fewer than an average day, which makes it the rarest birthday after February 29. Valentine's Day, which is not a day off, is slightly above average.
Why are some birthdays rarer than others?
Holidays and weekends. The rarest dates are holidays or the days around them, such as Christmas, New Year, July 4 and the days of Thanksgiving week in late November. Weekends have fewer births than weekdays too. A CDC study of 2013 births found cesarean deliveries without labor peak at 8 a.m. and noon, so planned births follow working hours. If fewer births are planned on holidays and weekends, those dates end up with fewer birthdays.
Seasons. Births rise through the summer to a peak in September, the month with the most births a day; January has the fewest. Nine months before mid-September is the December holiday season.
Leap day. February 29 comes once every four years, so it has less than a quarter as many birthdays in total, and even in a leap year it is below average.
None of this changes anything about you. A rare birthday is a fun fact, nothing more. To see your date's weekday story, try What Day Was I Born.
How Rare Is My Birthday questions
How rare is my birthday?
Enter it above to see its rank from 1 (most common) to 366 (rarest). To turn a rank into odds: about 1 in 331 US births fell on September 9, the most common date. March 21, at #149, had 1 in 363, and December 25 1 in 618. Most dates sit close to 1 in 365.
What is the rarest birthday?
February 29, with only about 1 in 1,631 births, because it comes once every four years. Even in a leap year it has about 10,512 births, 6% below an average day. Of the 365 regular dates, December 25 is the rarest.
Which birthday month is the most common?
September by births per day, which is how the list above ranks months. Count total birthdays instead and August comes first, with 7.62 million births over the 21 years against 7.44 million, because it has 31 days to September's 30. January has the fewest births per day.
Does the year I was born change my rank?
Ranks here combine 21 years, so they show how common a date is in general. In any single year a date can move up or down, mostly because it falls on a different weekday.
Is this data from the whole world?
No. It counts US births only, from 1994 to 2014. Birth patterns differ from country to country, so a date that is rare in the US may not be rare elsewhere.
Is my birthday stored?
No. The rank is looked up in your browser and nothing is sent to us.
Published October 2, 2026. Last updated October 7, 2026. Uses the Gregorian calendar and your device's time zone.