Is September 18 a rare birthday? Very common
More common than 98% of all 366 dates.
September 18 in numbers
The odds, the star sign and the other dates that come with it.
Where September 18 ranks
From most common birthday to rarest, September 18 ranks in position #9, with 11,736 births a year. 357 other dates are rarer. 13 dates are within 1% of its count, anywhere from #2 to #15, so the exact position is a close thing.
September 18 through the years
Where it ranked in the United States, year by year.
common
September 18 in other countries
September 18 is the 9th most common birthday in the United States. It is among the 50 most common in 19 of the 26 other countries, and ranges from #2 in Hungary and the Philippines to #362 in Chile.
Hungary
#2 of 366
357 births on an average September 18
KSH, 1970–2020Philippines
#2 of 366
5,458 births on an average September 18
PSA, 2006–2024Guatemala
#3 of 366
1,106 births on an average September 18
INE Guatemala, 2018–2024Costa Rica
#4 of 366
192 births on an average September 18
INEC Costa Rica, 2014–2024Mexico
#4 of 366
6,091 births on an average September 18
INEGI, 2017–2023Malaysia
#5 of 366
1,532 births on an average September 18
DOSM, 2000–2022Japan
#8 of 366
3,080 births on an average September 18
e-Stat, 1996–2025Portugal
#8 of 366
326 births on an average September 18
INE Portugal, 1980–2025England & Wales
#9 of 366
1,905 births on an average September 18
ONS, 1995–2025Netherlands
#10 of 366
539 births on an average September 18
CBS, 1995–2025Germany
#12 of 366
2,261 births on an average September 18
Destatis, 2014–2025Slovenia
#13 of 366
59 births on an average September 18
SURS, 2000–2025Ecuador
#14 of 366
811 births on an average September 18
INEC, 2013–2023Ireland
#17 of 366
179 births on an average September 18
CSO, 1980–2023Peru
#18 of 366
1,282 births on an average September 18
INEI, 2019–2025New Zealand
#22 of 366
167 births on an average September 18
Stats NZ, 1980–2023Latvia
#24 of 366
58 births on an average September 18
CSB, 1996–2025Switzerland
#43 of 366
231 births on an average September 18
FSO, 1969–2025France
#47 of 366
2,233 births on an average September 18
INSEE, 1998–2024Denmark
#56 of 366
175 births on an average September 18
Statistics Denmark, 2007–2025Belgium
#102 of 366
333 births on an average September 18
Statbel, 1992–2025Finland
#121 of 366
145 births on an average September 18
Statistics Finland, 2010–2025Brazil
#125 of 366
8,196 births on an average September 18
DATASUS, 1997–2024Norway
#170 of 366
157 births on an average September 18
SSB, 2011–2025Argentina
#186 of 366
1,508 births on an average September 18
DEIS, 2018–2023Chile
#362 of 366
498 births on an average September 18
DEIS, 1990–2017
Famous people born on September 18
Ranked by how often people looked them up on Wikipedia last year.
Patrick SchwarzeneggerAmerican actor · born 1993
James MarsdenAmerican actor · born 1973
James GandolfiniAmerican actor · born 1961
Jason SudeikisAmerican actor and comedian · born 1975
RonaldoBrazilian footballer · born 1976
Rick PitinoAmerican basketball coach · born 1952
Jada Pinkett SmithAmerican actress · born 1971
John McAfeeBritish and American programmer and businessman · born 1945September against the other eleven
September 18 is the 7th most common of the 30 days in September. All September birthdays.
September is the most common month of the year
An average September day sees 11,448 births in the United States. September is the busiest month, January the quietest.
Quick answers
How many babies are born on September 18?
About 11,736 a year in the United States. It was at its most common in 1979, when 11,185 babies were born and it ranked #1 of 365; at its rarest in 2022, with 7,393 births at #314.
Is September 18 a common birthday?
In the United States, September 18 is the 9th most common of 366 dates, with about 11,736 births a year. That puts it among the more common birthdays.
What is the rarest September birthday?
In the United States, September 2: the 118th rarest of all 366 dates, with about 10,653 births a year. The most common September birthday is September 9, the most common of the year.
How precise is the ranking?
In the middle of the calendar it is not exact. 13 other dates are within 1% of September 18's count, spread from #2 to #15, so the position inside that group would shift with a different set of years. That band is the accurate answer; the rank is the simple one. At the ends — Christmas Day, New Year's Day — nothing is close.
Is September 18 rarer in other countries?
In some. It is rarer in 17 of the 26 other countries we hold daily records for. It is at its rarest in Chile, at #362 of 366, and at its most common in Hungary and the Philippines, at #2.
How this is counted
Every date is ranked by how many babies are born on it in the United States. Live births by day of birth from the CDC's National Center for Health Statistics, 1989–2024.
Updated October 2026