How common is my birthday?
How common is a January 11 birthday?
How common is my birthday?
January 11
🙂 Pretty typical
#232 / 366
The 232nd most common US birthday · 1% less common than the average date
More common than 37% of other dates · US births 1994–2014
namelette.com/birthdays/january-11
Fun facts about January 11
- January is one of the quietest birth months in the data.
- About 11,020 US babies were born on January 11 in a typical year (average over 21 years).
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Where these numbers come from
Real US birth counts for every day from 1994–2014 (21 years, 85,712,738 births), published by FiveThirtyEight: US_births_1994-2003_CDC_NCHS.csv (CDC National Center for Health Statistics) and US_births_2000-2014_SSA.csv (Social Security Administration). The files overlap in 2000–2003; we use CDC/NCHS for 1994–1999 and SSA for 2000–2014 so each year counts once.
Method: for each year we divide each day's births by that year's daily average (so bigger and smaller years count equally), then average that ratio for each calendar date across the years it exists. February 29 is averaged over the 5 leap years only (1996, 2000, 2004, 2008, 2012), so it isn't penalized for existing once every four years. Dates are ranked 1–366. Averaging over many years also evens out the weekday effect (fewer births on weekends). This is for fun, not a forecast.