Is March 21 a rare birthday? Ordinary
Rarer than 54% of all 366 dates.
March 21 in numbers
The odds, the star sign and the other dates that come with it.
Where March 21 ranks
From most common birthday to rarest, March 21 ranks in position #197, with 10,771 births a year. 196 other dates are more common. 88 dates are within 1% of its count, anywhere from #155 to #243, so the exact position is a close thing.
March 21 through the years
Where it ranked in the United States, year by year.
common
March 21 in other countries
March 21 is the 170th rarest birthday in the United States. It is among the 50 rarest in 3 of the 26 other countries, and ranges from #31 in Latvia to #351 in Japan.
Latvia
#31 of 366
58 births on an average March 21
CSB, 1996–2025Brazil
#46 of 366
8,563 births on an average March 21
DATASUS, 1997–2024Argentina
#49 of 366
1,678 births on an average March 21
DEIS, 2018–2023Ireland
#86 of 366
172 births on an average March 21
CSO, 1980–2023Hungary
#101 of 366
333 births on an average March 21
KSH, 1970–2020Costa Rica
#146 of 366
170 births on an average March 21
INEC Costa Rica, 2014–2024Norway
#148 of 366
160 births on an average March 21
SSB, 2011–2025Ecuador
#194 of 366
761 births on an average March 21
INEC, 2013–2023Slovenia
#195 of 366
53 births on an average March 21
SURS, 2000–2025Switzerland
#195 of 366
222 births on an average March 21
FSO, 1969–2025Chile
#199 of 366
688 births on an average March 21
DEIS, 1990–2017Belgium
#202 of 366
325 births on an average March 21
Statbel, 1992–2025New Zealand
#210 of 366
156 births on an average March 21
Stats NZ, 1980–2023Guatemala
#222 of 366
937 births on an average March 21
INE Guatemala, 2018–2024Finland
#224 of 366
139 births on an average March 21
Statistics Finland, 2010–2025Germany
#230 of 366
1,978 births on an average March 21
Destatis, 2014–2025Malaysia
#257 of 366
1,376 births on an average March 21
DOSM, 2000–2022Denmark
#258 of 366
161 births on an average March 21
Statistics Denmark, 2007–2025Portugal
#259 of 366
291 births on an average March 21
INE Portugal, 1980–2025Mexico
#271 of 366
4,840 births on an average March 21
INEGI, 2017–2023Netherlands
#279 of 366
487 births on an average March 21
CBS, 1995–2025Peru
#313 of 366
1,129 births on an average March 21
INEI, 2019–2025England & Wales
#314 of 366
1,746 births on an average March 21
ONS, 1995–2025France
#340 of 366
2,052 births on an average March 21
INSEE, 1998–2024Philippines
#341 of 366
4,061 births on an average March 21
PSA, 2006–2024Japan
#351 of 366
2,343 births on an average March 21
e-Stat, 1996–2025
Famous people born on March 21
Ranked by how often people looked them up on Wikipedia last year.
Gary OldmanEnglish actor and filmmaker · born 1958
Ayrton SennaBrazilian racing driver · born 1960
Rosie O'DonnellAmerican comedian and actress · born 1962
Matthew BroderickAmerican actor · born 1962
RonaldinhoBrazilian footballer · born 1980
Scott EastwoodAmerican actor and producer · born 1986
Timothy DaltonBritish actor · born 1946
Jair BolsonaroPresident of Brazil from 2019 to 2023 · born 1955March against the other eleven
March 21 is the 6th most common of the 31 days in March. All March birthdays.
March is the 6th rarest month of the year
An average March day sees 10,658 births in the United States. September is the busiest month, January the quietest.
Quick answers
How many babies are born on March 21?
About 10,771 a year in the United States. It was at its most common in 1995, when 11,837 babies were born and it ranked #96 of 365; at its rarest in 1982, with 8,313 births at #354.
Is March 21 a common birthday?
In the United States, March 21 is the 170th rarest of 366 dates, with about 10,771 births a year. That makes it an ordinary birthday: neither rare nor especially common.
What is the rarest March birthday?
In the United States, March 13: the 22nd rarest of all 366 dates, with about 10,340 births a year. The most common March birthday is March 1, the 147th most common of the year.
How precise is the ranking?
In the middle of the calendar it is not exact. 88 other dates are within 1% of March 21's count, spread from #155 to #243, 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 March 21 rarer in other countries?
In some. It is rarer in 16 of the 26 other countries we hold daily records for. It is at its rarest in Japan, at #351 of 366, and at its most common in Latvia, at #31.
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