The twenty most common birthdays in the world
Eighteen in September, one in August and one in October.
- #1September 2021 countries+9.1%
- #2September 2118 countries+7.8%
- #3September 2521 countries+7.6%
- #4September 1820 countries+7.1%
- #5September 1215 countries+7.0%
- #6September 2322 countries+7.0%
- #7September 2218 countries+7.0%
- #8September 1920 countries+6.9%
- #9September 2419 countries+6.9%
- #10September 1417 countries+6.9%
- #11September 2619 countries+6.5%
- #12September 916 countries+6.4%
- #13September 1715 countries+6.4%
- #14September 1016 countries+6.3%
- #15September 1617 countries+6.0%
- #16September 2717 countries+6.0%
- #17September 2818 countries+6.0%
- #18October 118 countries+5.9%
- #19August 814 countries+5.8%
- #20September 1514 countries+5.4%
The twenty rarest birthdays in the world
Eight of the twenty fall between December 23 and January 2; of the other twelve, five in November, four in December and one each in February, April and May.
- #366December 25 Christmas Day26 countries−27.1%
- #365January 1 New Year's Day25 countries−22.3%
- #364December 24 Christmas Eve24 countries−18.0%
- #363December 31 New Year's Eve24 countries−17.9%
- #362December 2618 countries−13.0%
- #361February 29 Leap Day24 countries−12.2%
- #360May 115 countries−8.2%
- #359December 2317 countries−7.8%
- #358December 3016 countries−7.1%
- #357November 111 countries−6.4%
- #356January 213 countries−6.4%
- #355December 817 countries−6.4%
- #354November 3017 countries−5.4%
- #353December 915 countries−5.1%
- #352December 1314 countries−4.8%
- #351November 2613 countries−4.8%
- #350April 1 April Fools' Day17 countries−4.8%
- #349December 715 countries−4.8%
- #348November 2914 countries−4.8%
- #347November 2316 countries−4.6%
The year in 27 countries
The most births per day come in September in 15 of the 27 countries, July in 8 and March in 3. Ecuador peaks in May. The fewest come in December, in 16 of them, and March, in 3 of them.
RarestMost common
Every country's most common and rarest birthday
Each date is measured against that country's own average day.
| Place | Most common | Rarest | Records |
|---|---|---|---|
| Americas | |||
| United States | September 9Sep 9+10% | December 25Dec 25−40% | NCHS, 1989–2024 |
| Argentina | January 3Jan 3+21% | December 25Dec 25−49% | DEIS, 2018–2023 |
| Brazil | March 10Mar 10+11% | December 25Dec 25−31% | DATASUS, 1997–2024 |
| Chile | December 27Dec 27+18% | December 25Dec 25−38% | DEIS, 1990–2017 |
| Costa Rica | September 19Sep 19+17% | January 1Jan 1−22% | INEC Costa Rica, 2014–2024 |
| Ecuador | February 14Feb 14+16% | January 1Jan 1−31% | INEC, 2013–2023 |
| Guatemala | September 20Sep 20+18% | December 31Dec 31−29% | INE Guatemala, 2018–2024 |
| Mexico | September 14Sep 14+23% | December 25Dec 25−35% | INEGI, 2017–2023 |
| Peru | March 5Mar 5+10% | December 25Dec 25−28% | INEI, 2019–2025 |
| Europe | |||
| Belgium | July 23Jul 23+9% | December 25Dec 25−39% | Statbel, 1992–2025 |
| Denmark | August 18Aug 18+12% | December 24Dec 24−33% | Statistics Denmark, 2007–2025 |
| England & Wales | September 26Sep 26+8% | December 26Dec 26−28% | ONS, 1995–2025 |
| Finland | September 20Sep 20+13% | December 25Dec 25−29% | Statistics Finland, 2010–2025 |
| France | September 20Sep 20+7% | December 25Dec 25−23% | INSEE, 1998–2024 |
| Germany | August 8Aug 8+14% | December 25Dec 25−30% | Destatis, 2014–2025 |
| Hungary | July 25Jul 25+10% | January 1Jan 1−20% | KSH, 1970–2020 |
| Ireland | September 27Sep 27+11% | December 26Dec 26−36% | CSO, 1980–2023 |
| Latvia | June 19Jun 19+16% | December 25Dec 25−33% | CSB, 1996–2025 |
| Netherlands | September 24Sep 24+10% | December 26Dec 26−29% | CBS, 1995–2025 |
| Norway | June 28Jun 28+16% | December 25Dec 25−32% | SSB, 2011–2025 |
| Portugal | September 16Sep 16+11% | December 25Dec 25−31% | INE Portugal, 1980–2025 |
| Slovenia | September 20Sep 20+17% | November 1Nov 1−29% | SURS, 2000–2025 |
| Switzerland | September 25Sep 25+10% | December 25Dec 25−26% | FSO, 1969–2025 |
| Asia & Pacific | |||
| Japan | September 25Sep 25+15% | January 1Jan 1−32% | e-Stat, 1996–2025 |
| Malaysia | October 10Oct 10+12% | December 25Dec 25−12% | DOSM, 2000–2022 |
| New Zealand | September 27Sep 27+9% | December 25Dec 25−25% | Stats NZ, 1980–2023 |
| Philippines | September 8Sep 8+23% | February 29Feb 29−26% | PSA, 2006–2024 |
Quick answers
What is the most common birthday in the world?
September 20. Across 27 countries and 415,035,311 births, it has 9.1% more births than an average day. It is the most common birthday of all in Guatemala, Finland, France and Slovenia.
What is the rarest birthday in the world?
December 25, Christmas Day, with 27.1% fewer births than an average day across the 27 countries. It is the rarest birthday in 16 of them. The next rarest are New Year's Day and Christmas Eve.
Why is September 20 the most common birthday?
Count back thirty-eight weeks from September 20 and you land on December 28, between Christmas and New Year: the one stretch of the year when most people are off work together.
Is the most common birthday the same in every country?
No. Fifteen of the 27 countries have their most common birthday in September, from September 8 in the Philippines to September 27 in Ireland and New Zealand. The other 12 peak elsewhere in the year, from January 3 in Argentina to December 27 in Chile.
How is the world ranking calculated?
Each country's dates are measured against that country's own average day, and a date's world score is the average of its 27 scores. That way the United States, with 142,623,862 births in its records, counts no more than Slovenia, with 503,872. A country is included when its records hold at least 500,000 births.