Every birthday, one page at a time
Each of the 366 dates below has its own page: its rank, its birth odds, the days around it, its trend over time and its rank in five countries.
Or check your birthday on the front page →
Every date is coloured by the same six rarity tiers the reveal uses, and the small number is its position from most common (#1) to least common (#366) by recorded U.S. births, 1994–2014.
- Super rare3
- Very rare15
- Rare18
- Uncommon147
- Common92
- Very common91
All 366 dates from most to least common
All 366 dates sorted by recorded U.S. births 1994–2014, coloured by rarity tier.
January
February
March
April
May
June
July
August
September
October
November
December
Sources, method and limits
Main ranking: 85,712,738 recorded U.S. births on 7,670 calendar dates, 1994–2014. CDC/NCHS daily counts for 1994–1999 and Social Security Administration daily counts for 2000–2014, as compiled by FiveThirtyEight and attributed under CC BY 4.0. The overlapping years 2000–2003 are counted once.
Ranks compare totals across the 366 observed month-and-day dates. February 29 occurred 5 times in this window; every other date occurred 21 times, so per-occurrence figures are used wherever seasonality is compared.
Every figure above comes from the administrative records named here, at the granularity those records publish: a day, a month or a year. Coverage and definitions differ between countries and eras, so two sources are combined only where their documentation states the windows are separate, and the page where that happens says so.
Full method, leap-day treatment and definitions.
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