Birthday research
Twenty-one studies. Twenty are built from official records, each naming its own source and period; one describes how this site itself was used. Nothing is pooled across countries or eras. Every figure names its window.
Rankings by country
Each country on its own series and its own window; countries are set side by side only inside the matched years, and only by rank or index.
Does your birthday rank the same in five countries?Matched 2007–2014 daily births in United States, England & Wales, Denmark, Metropolitan France and Malaysia, compared per occurrence.
Which birthdays are most common in Malaysia?National Registration Department daily births, 2000–2022, and the repeated-digit dates at the top of its calendar.
What is the most common birthday in England & Wales?All 366 dates ranked from the Office for National Statistics daily series, 2006–2025: September 25 first, December 26 last, with months, weekdays and the weekend gap by year.
What is the most common birthday in Denmark?All 366 dates ranked from the Statistics Denmark daily series, 2007–2025: August 18 first, December 24 last, with months, weekdays and the weekend gap by year.
What is the most common birthday in France?All 366 dates ranked from the INSEE daily series, 2004–2023: July 20 first, December 25 last, with months, weekdays and the weekend gap by year.- Birthdays in India: what the official records showNational registration totals, Kerala by reported month, and the grain of the official records.
When are Canadians born?Statistics Canada live births by month of birth, 1991–2024, adjusted for month length.
Year by year
The latest complete year of each daily series, with the weekday each date fell on. Every earlier year is listed on the country’s own page.
What was the most common birthday in France in 2025?Every day of 2025 ranked by recorded births with the weekday it fell on: July 18, a Friday, busiest; May 11 quietest; 643,905 births from INSEE.
What was the most common birthday in England & Wales in 2025?Every day of 2025 ranked by recorded births with the weekday it fell on: May 28, a Wednesday, busiest; December 26 quietest; 585,396 births from Office for National Statistics.
What was the most common birthday in Denmark in 2025?Every day of 2025 ranked by recorded births with the weekday it fell on: July 15, a Tuesday, busiest; December 25 quietest; 59,443 births from Statistics Denmark.
What was the most common birthday in Metropolitan France in 2023?Every day of 2023 ranked by recorded births with the weekday it fell on: July 7, a Friday, busiest; December 25 quietest; 639,533 births from INSEE.
What was the most common birthday in Malaysia in 2022?Every day of 2022 ranked by recorded births with the weekday it fell on: February 22, a Tuesday, busiest; May 2 quietest; 437,710 births from Jabatan Pendaftaran Negara (National Registration Department), Malaysia.
Then and now
Two windows of one series compared by share of the year, with the weekend days each date fell on beside every move.
- Which birthdays became rarer?Two complete decades of one ONS vintage, 1995–2004 against 2016–2025, compared by share of births.
What were the most common birthdays in 1969–1988?Every date ranked from 70,485,508 births in the earlier daily file, then set beside 1994–2014 by share: the weekend gap year by year, months, fixed-date holidays and the dates that moved.
How did birthdays in France change between 1968–1977 and 2014–2023?One INSEE series for metropolitan France: the seasonal peak moved from May to July, May 8 fell most as a share of the year, and the weekend gap opened then narrowed over 56 years.
Which U.S. birthdays became more common?Each date’s share of births in 2000–2004 against 2010–2014, one SSA file, with the weekend days counted in each window.
Holidays and special dates
Fixed dates ranked, moving holidays measured against matched control days, and one date that comes every fourth year.
How rare is a Christmas birthday?Christmas and New Year dates ranked in five countries over the matched years, and Christmas Day’s index year by year since 1968 in four long series, each against itself.
How rare is a leap day birthday?February 29 in every leap year of five national series, with its weekday; the one-in-N odds over whole windows; and the 3,929 people living in Denmark who have the birthday.
What happens to births on a bank holiday?Good Friday, Easter Monday and the three Monday bank holidays against the same weekday two weeks either side in the same year, England & Wales 1995–2025: 82% to 88% of control days, below them in every year.
What happens to births on Labor Day and Thanksgiving?Moving U.S. holidays derived from the OPM rule and compared with matched same-weekday control days, 1994–2014.
People and the week
Who is alive with a birthday, which weekday births favour, and what visitors look up here.
How many people in Denmark share your birthday?6,025,603 residents on January 1, 2026 counted by calendar birthday, a stock of people, with the two administrative dates labelled and the resident calendar set beside the birth flow.
Which weekday has the most births?Every day in the U.S. daily file, 2000–2014, grouped by weekday and by month.- Which birthdays do visitors check next?Aggregate counts from this site's own usage store, published only in aggregate, with the default-date bias and every limit stated.
Answer pages
The most common birthdayTop ten dates and odds from 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014.
The least common birthdayLeap day, and the rarest date that happens every year.
The most common birth monthTwelve months ranked by births per day.- All 366 datesOne page per birthday.
- Sources and methodThe statistical offices behind every figure, and how a birthday rank is computed from their records.
The figures shown are the research output; to discuss source access, write to me.